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A Review on Vibration Control of Multiple Cylinders Subjected to FlowInduced Vibrations 被引量:1
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作者 XU Wan-hai MA Ye-xuan 《China Ocean Engineering》 SCIE EI CSCD 2024年第2期183-197,共15页
The fatigue damage caused by flow-induced vibration(FIV)is one of the major concerns for multiple cylindrical structures in many engineering applications.The FIV suppression is of great importance for the security of ... The fatigue damage caused by flow-induced vibration(FIV)is one of the major concerns for multiple cylindrical structures in many engineering applications.The FIV suppression is of great importance for the security of many cylindrical structures.Many active and passive control methods have been employed for the vibration suppression of an isolated cylinder undergoing vortex-induced vibrations(VIV).The FIV suppression methods are mainly extended to the multiple cylinders from the vibration control of the isolated cylinder.Due to the mutual interference between the multiple cylinders,the FIV mechanism is more complex than the VIV mechanism,which makes a great challenge for the FIV suppression.Some efforts have been devoted to vibration suppression of multiple cylinder systems undergoing FIV over the past two decades.The control methods,such as helical strakes,splitter plates,control rods and flexible sheets,are not always effective,depending on many influence factors,such as the spacing ratio,the arrangement geometrical shape,the flow velocity and the parameters of the vibration control devices.The FIV response,hydrodynamic features and wake patterns of the multiple cylinders equipped with vibration control devices are reviewed and summarized.The FIV suppression efficiency of the vibration control methods are analyzed and compared considering different influence factors.Further research on the FIV suppression of multiple cylinders is suggested to provide insight for the development of FIV control methods and promote engineering applications of FIV control methods. 展开更多
关键词 flow-induced vibration vibration control multiple cylinders TANDEM side-by-side staggered
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Light-modulated graphene-based φ_(0) Josephson junction and -φ_(0) to φ_(0) transition
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作者 程任翔 于苗 +4 位作者 汪洪 曹德亮 李兴鳌 戚凤华 周兴飞 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第2期476-481,共6页
We investigate the chiral edge states-induced Josephson current–phase relation in a graphene-based Josephson junction modulated by the off-resonant circularly polarized light and the staggered sublattice potential.By... We investigate the chiral edge states-induced Josephson current–phase relation in a graphene-based Josephson junction modulated by the off-resonant circularly polarized light and the staggered sublattice potential.By solving the Bogoliubov–de Gennes equation,a φ_(0) Josephson junction is induced in the coaction of the off-resonant circularly polarized light and the staggered sublattice potential,which arises from the fact that the center of-mass wave vector of Cooper pair becomes finite and the opposite center of-mass wave vector to compensate is lacking in the nonsuperconducting region.Interestingly,when the direction of polarization of light is changed,-φ_(0) to φ_(0) transition generates,which generalizes the concept of traditional 0–πtransition.Our findings provide a purely optical way to manipulate a phase-controllable Josephson device and guidelines for future experiments to confirm the presence of graphene-based φ_(0)Josephson junction. 展开更多
关键词 GRAPHENE circularly polarized light staggered sublattice potential φ_(0)Josephson junction
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Moderating effect of corporate financialization on the impact of climate policy on corporate green innovation:Evidence from China
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作者 Chao Tu Zhilong Qin Qingqing Yang 《Chinese Journal of Population,Resources and Environment》 2024年第3期230-240,共11页
With intensifying global climate change,humanity is confronted with unparalleled environmental challenges and risks.This study employs the staggered difference-in-difference model to examine the relationship between c... With intensifying global climate change,humanity is confronted with unparalleled environmental challenges and risks.This study employs the staggered difference-in-difference model to examine the relationship between climate policy and green innovation in the corporate financialization context.Using Chinese-listed company data from 2008 to 2020,our analysis reveals a favorable correlation between China’s carbon emission trading policy(CCTP)and advancements in green innovation.Furthermore,we find that the level of corporate financialization moderates this correlation,diminishing the driving effect of CCTP on green innovation.Additionally,results of heterogeneity analysis show that this moderating consequence is more evident in non-state owned and low-digitization enterprises compared with state-owned and high-digitization ones.Our findings contribute to the existing literature by clarifying the interaction between CCTP,green innovation,and corporate financialization.Our research provides valuable insights for policymakers and stakeholders seeking to strengthen climate policies and encourages green innovation in different types of businesses. 展开更多
关键词 Staggered DID Model China’s carbon emission trading policy Green innovation Corporate financialization DIGITALIZATION
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Investigate the Impact of Dimple Size and Distribution on the Hydrothermal Performance of Dimpled Heat Exchanger Tubes
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作者 Abeer H.Falih Basima Salman Khalaf Basim Freegah 《Frontiers in Heat and Mass Transfer》 EI 2024年第2期597-613,共17页
In this study,the primary objective was to enhance the hydrothermal performance of a dimpled tube by addressing areas with low heat transfer compared to other regions.To accomplish this,a comprehensive numerical inves... In this study,the primary objective was to enhance the hydrothermal performance of a dimpled tube by addressing areas with low heat transfer compared to other regions.To accomplish this,a comprehensive numerical investigation was conducted using ANSYS Fluent 2022 R1 software,focusing on different diameters of dimples along the pipe’s length and the distribution of dimples in both in-line and staggered arrangements.The simulations utilized the finite elementmethod to address turbulent flowwithin the tube by solving partial differential equations,encompassing Re numbers spanning from 3000 to 8000.The study specifically examined single-phase flow conditions,with water utilized as the cooling fluid.The results of the investigation indicated that increasing the Reynolds number resulted in higher average Nusselt numbers,pressure drops,the overall performance criterion,and a reduction in average thermal resistance across all models analyzed.Notably,both proposedmodels demonstrated improved heat transfer when compared to the conventional model.Out of all the models evaluated,the tube featuring staggered dimples(Model B)demonstrated the most notable improvement in the Nu number.It exhibited an enhancement of approximately twice the value compared to the conventional model.The mean thermal resistance for the tube with dimples in the staggered arrangement(Model B)is 0.0057 k/W,compared to 0.0118 k/W for the traditional model.The maximum overall performance criterion for Model-A-and Model-Bis 1.22 and 1.33,respectively. 展开更多
关键词 Dimpled tube numerical simulation in-line and staggered arrangements overall performance criterion(OPC)
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海洋石油平台应急泄放系统流程优化与分析
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作者 肖峰超 张时佳 杨飞 《石油和化工设备》 CAS 2024年第9期87-89,共3页
在海洋石油平台的生产过程中,应急泄放系统是海洋平台上非常重要的安全系统。当平台在应急工况时会触发应急放空阀应急泄放,此时平台的所有系统的应急放空阀会同时打开进行泄压保护。此时平台的泄放量需考虑所有应急放空阀泄放量的累加... 在海洋石油平台的生产过程中,应急泄放系统是海洋平台上非常重要的安全系统。当平台在应急工况时会触发应急放空阀应急泄放,此时平台的所有系统的应急放空阀会同时打开进行泄压保护。此时平台的泄放量需考虑所有应急放空阀泄放量的累加之和,泄放量通常会非常大,因此会导致平台的应急泄放系统能力偏大,设计冗余过大,过于保守设计。本文将采用HYSYS中的Staggered BLOWDOWN模块对平台应急泄放源进行动态模拟,拟采用交替错峰的方式优化泄放流程,减小海洋石油平台在应急工况泄放时的最大泄放量,从而达到优化应急泄放系统的目的,实现降本增效。 展开更多
关键词 应急泄放 动态模拟 交替错峰 Staggered BLOWDOWN
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Study on the Influence of Aspect Ratio on the Seismic Response and Overturning Resistance of a New Staggered Story Isolated Structure
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作者 Tiange Zhao Dewen Liu 《World Journal of Engineering and Technology》 2024年第3期617-634,共18页
The aspect ratio of the structure has a significant impact on the overall stability of the ultra high-rise building. A large aspect ratio of the structure increases the risk of overturning and reduces the lateral stif... The aspect ratio of the structure has a significant impact on the overall stability of the ultra high-rise building. A large aspect ratio of the structure increases the risk of overturning and reduces the lateral stiffness of the structure, leading to significant tensile and compressive stresses in the isolated bearings. To study the effect of aspect ratio on the seismic response and overturning resistance of a new staggered story isolated structure, three models with different aspect ratios were established. Nonlinear time-history analysis of the three models was conducted using ETABS finite element software. The results indicate that the overturning moment and overturning resistance moment of the superstructure in the new staggered story isolated structure increase with an increasing aspect ratio. However, the increase in the overturning moment of the superstructure is much greater than the increase in the overturning resistance moment, resulting in a decrease in the overturning resistance ratio of the superstructure with an increasing aspect ratio. The overturning moment and overturning resistance moment of the substructure in the new staggered story isolated structure decrease with an increasing aspect ratio. However, the decrease in the overturning moment of the substructure is greater than the decrease in the overturning resistance moment, leading to an increase in the overturning resistance ratio of the substructure with an increasing aspect ratio. The decrease in the overturning resistance ratio of the superstructure in the new staggered story isolated structure is much greater than the increase in the overturning resistance ratio of the substructure. Therefore, as the aspect ratio of the overall structure increases, the overturning resistance ratio of the superstructure and the entire structure decreases. 展开更多
关键词 Aspect Ratio A New Staggered Story Isolated Structure Seismic Response Overturning Resistance Ratio Isolated Bearing
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Progressive Collapse Resistance of a New Staggered Story Isolated System
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作者 Yutong Yang Yuancheng Mi +4 位作者 Hong Li Zhongfa Guo Dewen Liu Weiwei Sun Min Lei 《Open Journal of Applied Sciences》 2024年第3期643-659,共17页
A new staggered isolated system developed from the mid-story isolated system is the new staggered story isolated system. There are not many studies on this structure currently. In this study, an 18-story new staggered... A new staggered isolated system developed from the mid-story isolated system is the new staggered story isolated system. There are not many studies on this structure currently. In this study, an 18-story new staggered story isolated system model is established using SAP2000. The dynamic nonlinear dynamic alternate method is used to analyze the structure against progressive collapse. Results show that the structure has good resistance to progressive collapse, and there is no progressive collapse under each working condition. The progressive collapse does not occur for the case of removing only one vertical structural member of the new staggered of isolated system. The side column has big influence on this isolated structures’ progressive collapse;the removal of vertical structural member of the isolation layer has less impact on the structure than the removal of the bottom vertical structural member. After the removing of the member, the internal force of the structure will be redistributed, and the axial force of the adjacent columns will change obviously, showing a trend of “near large and far small”. 展开更多
关键词 The New Staggered Story Isolated System Alternative Load Path Method Collapse Resistance
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同类玻色子四极相互作用与Staggering现象 被引量:1
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作者 张大立 《平顶山师专学报》 1999年第2期20-23,共4页
在IBM2 中引入同类玻色子间的四极相互作用,利用对称性分析和OAI方法讨论了引入这种相互作用的重要性,并分析了这种相互作用改善Staggering
关键词 staggering现象 四极相互作用 玻色子 原子核
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Improved Staggered Algorithm for Phase-Field Brittle Fracture with the Local Arc-Length Method 被引量:1
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作者 Zhijian Wu Li Guo Jun Hong 《Computer Modeling in Engineering & Sciences》 SCIE EI 2023年第1期611-636,共26页
The local arc-length method is employed to control the incremental loading procedure for phase-field brittle fracture modeling.An improved staggered algorithm with energy and damage iterative tolerance convergence cri... The local arc-length method is employed to control the incremental loading procedure for phase-field brittle fracture modeling.An improved staggered algorithm with energy and damage iterative tolerance convergence criteria is developed based on the residuals of displacement and phase-field.The improved staggered solution scheme is implemented in the commercial software ABAQUS with user-defined element subroutines.The layered system of finite elements is utilized to solve the coupled elastic displacement and phase-field fracture problem.A one-element benchmark test compared with the analytical solution was conducted to validate the feasibility and accuracy of the developed method.Our study shows that the result calculated with the developed method does not depend on the selected size of loading increments.The results of several numerical experiments show that the improved staggered algorithm is efficient for solving the more complex brittle fracture problems. 展开更多
关键词 Phase-field model brittle fracture crack propagation ABAQUS subroutine staggered algorithm
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Buckling morphology of glassy nematic films with staggered director field
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作者 Shan XIA Linghui HE 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2023年第11期1841-1852,共12页
The photo-induced buckling of axially periodic glassy nematic films with alternating stripped director domains is explored by the F¨oppl-von K′arm′an plate theory along with a modified kinetics approach.The eff... The photo-induced buckling of axially periodic glassy nematic films with alternating stripped director domains is explored by the F¨oppl-von K′arm′an plate theory along with a modified kinetics approach.The effects of domain widths on the critical light intensity as well as the buckling morphology are examined numerically.It is found that in most cases the buckled film forms regularly aligned dimples and protrusions,but shows large scale bending perpendicular to the periodic axis if the widths of the stripes are nearly the same.In addition,change in light intensity is shown to alter the wavenumber of the buckling pattern.These results are expected helpful to the design of shape-shifting structures with glassy nematic films. 展开更多
关键词 glassy nematic flm buckling morphology staggered director field
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Cross Flow Characteristics and Heat Transfer of Staggered Tubes Bundle: A Numerical Study
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作者 Husam Rashid Hudear Saad Najeeb Shehab 《Frontiers in Heat and Mass Transfer》 EI 2023年第1期367-383,共17页
This paper presents a numerical emulation study of heat transmission through tube banks in three-dimensions.Staggered configuration is displayed by fluid dynamics using computer programs(CFD)software(ANSYS fluent).The... This paper presents a numerical emulation study of heat transmission through tube banks in three-dimensions.Staggered configuration is displayed by fluid dynamics using computer programs(CFD)software(ANSYS fluent).The computer model is used to predict the values of the Nusselt number when changing the values of heat flux and longitudinal pitch.The longitudinal pitch(SL/D)of 1.3,1.8,and 2.4 mm.The transverse pitch(ST/D)of 1.5 mm,and also considered Reynolds numbers 10000,13000,17000,and 190000.The staggered configuration of the tube bundle is demonstrated to investigate the impact of this arrangement on the heat transmission rate from the tubes.The gotten results indicate that the rate of heat transmission increases with decreases in the longitudinal spacing(SL).As the longitudinal spacing(SL)increases to about 44%the Nusselt number is slightly decreased by about 9%.The coefficient of heat transmission,Nusselt number,and the heat transmission data obtained from(CFD)Compared to previous research results,there is a decent agreement originating after comparison. 展开更多
关键词 Tube bundle numerical study longitudinal pitch CROSS-FLOW staggered
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An Experimental Investigation of Aero-Foil-Shaped Pin Fin Arrays
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作者 Mainak Bhaumik Anirban Sur Kavita Dhanawade 《Frontiers in Heat and Mass Transfer》 EI 2023年第1期467-486,共20页
Pin fins are widely used in applications where effective heat transfer is crucial.Their compact design,high surface area,and efficient heat transfer characteristics make them a practical choice for many thermal manage... Pin fins are widely used in applications where effective heat transfer is crucial.Their compact design,high surface area,and efficient heat transfer characteristics make them a practical choice for many thermal management applications.But for a high heat transfer rate and lightweight application,aerofoil shape pin fins are a good option.This work focuses on an experimental model analysis of pin-fins with aerofoil shapes.The results were evaluated between perforation,no perforation,inline,and staggered fin configurations.Aluminum is used to make the pin fins array.The experiment is carried out inside a wind tunnel,and the heat supply varies between 500 to 3000 W.An electric heater,fan,anemometer,thermocouple,pressure transmitter,data logger,and computer system were used for this experiment.The friction factor,thermal efficiency,performance efficacy,and pressure drop of a pin fin aerofoil shape have been assessed.A comparison study was carried out with and without perforations and inline and staggered arrangements.In terms of overall efficacy,different aerofoil shape pin fin arrays achieve values varying between 1.8 and 14.7.The acquired data demonstrate that perforated staggered configurations perform 10%better than inline.Furthermore,the pressure drop is reduced by 50%in staggered setups.The empirical correlation of Dittus-Bolter and Blasius correlations was used to validate the experimental heat dissipation enhancement factor requirements of Nusselt number and friction factor.The validation of the experiment using correlation has been completed satisfactorily.Hence,experimental results prove that aerofoil pin-fin arrays can be used successfully for applications like the electronics industry,heat exchangers and gas turbine blade cooling. 展开更多
关键词 Aerofoil pin-fin array inline and staggered arrangements heat dissipation rate pin fin efficiency performance
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Multicomponent seismic forward modeling of gas hydrates beneath the seafloor 被引量:3
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作者 杨佳佳 何兵寿 张建中 《Applied Geophysics》 SCIE CSCD 2014年第4期418-428,509,共12页
We investigated the effect of microscopic distribution modes of hydrates in porous sediments, and the saturation of hydrates and free gas on the elastic properties of saturated sediments. We simulated the propagation ... We investigated the effect of microscopic distribution modes of hydrates in porous sediments, and the saturation of hydrates and free gas on the elastic properties of saturated sediments. We simulated the propagation of seismic waves in gas hydrate-bearing sediments beneath the seafloor, and obtained the common receiver gathers of compressional waves(P-waves) and shear waves(S-waves). The numerical results suggest that the interface between sediments containing gas hydrates and free gas produces a large-amplitude bottomsimulating reflector. The analysis of multicomponent common receiver data suggests that ocean-bottom seismometers receive the converted waves of upgoing P- and S-waves, which increases the complexity of the wavefield record. 展开更多
关键词 gas hydrates BSR finite difference forward modeling staggered grid
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The numerical simulation for a 3D two-phase anisotropic medium based on BISQ model 被引量:3
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作者 王者江 何樵登 王德利 《Applied Geophysics》 SCIE CSCD 2008年第1期24-34,共11页
Biot-flow and squirt-flow are the two most important fluid flow mechanisms in porous media containing fluids. Based on the BISQ (Biot-Squirt) model where the two mechanisms are treated simultaneously, the elastic wa... Biot-flow and squirt-flow are the two most important fluid flow mechanisms in porous media containing fluids. Based on the BISQ (Biot-Squirt) model where the two mechanisms are treated simultaneously, the elastic wave-field simulation in the porous medium is limited to two-dimensions and two-components (2D2C) or two-dimensions and three-components (2D3C). There is no previous report on wave simulation in three- dimensions and three-components. Only through three dimensional numerical simulations can we have an overall understanding of wave field coupling relations and the spatial distribution characteristics between the solid and fluid phases in the dual-phase anisotropic medium. In this paper, based on the BISQ equation, we present elastic wave propagation in a three dimensional dual-phase anisotropic medium simulated by the staggered-grid high-order finite-difference method. We analyze the resulting wave fields and show that the results are an improvement. 展开更多
关键词 BISQ model three-dimension numerical simulation staggered grid two-phase anisotropic medium.
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Ce偶-偶同位素低激发态性质的IBM2描述
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作者 张大立 曹华伟 《武汉大学学报(理学版)》 CAS CSCD 北大核心 2002年第5期585-588,共4页
通过考虑同类核子相干对间的四极相互作用 ,在IBM2中对Ce偶 偶同位素1 2 8Ce 1 38Ce的低激发态能谱和E2跃迁几率及分支比进行了理论分析 ,计算结果有效地改善了IBM中这些核的准γ带能谱的Staggering现象描述 。
关键词 Ce偶-偶同位素 低激发态 IBM2描述 原子核结构 Ce同位素 staggering现象 E2跃迁几率 相互作用玻色子模型 四极相互作用
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Pd偶-偶同位素核低激发态性质的IBM2描述
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作者 张大立 《湖州师范学院学报》 2001年第6期31-35,共5页
通过考虑同类核子相干对间的四极相互作用 ,在IBM2中对Pd偶 -偶同位素10 0 Pd - 116Pd的低激发态能谱和E2跃迁几率及分支比进行了理论分析 ,计算结果有效地改善了IBM中这些核的准γ带能谱的Staggering现象 ,较精确地描述了实验观察到的... 通过考虑同类核子相干对间的四极相互作用 ,在IBM2中对Pd偶 -偶同位素10 0 Pd - 116Pd的低激发态能谱和E2跃迁几率及分支比进行了理论分析 ,计算结果有效地改善了IBM中这些核的准γ带能谱的Staggering现象 ,较精确地描述了实验观察到的低激发态性质 . 展开更多
关键词 原子核结构 Pd同位素 staggering现象 E2跃迁 分支比 相互作用玻色子模型 四极相互作用 低激发态 IBM2
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Cosine-modulated window function-based staggered-grid finite-difference forward modeling 被引量:5
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作者 王建 孟小红 +2 位作者 刘洪 郑婉秋 贵生 《Applied Geophysics》 SCIE CSCD 2017年第1期115-124,191,共11页
The numerical dispersion and computational cost are high for conventional Taylor series expansion staggered-grid finite-difference forward modeling owing to the high frequency of the wavelets and the large grid interv... The numerical dispersion and computational cost are high for conventional Taylor series expansion staggered-grid finite-difference forward modeling owing to the high frequency of the wavelets and the large grid intervals. In this study, the cosine-modulated binomial window function (CMBWF)-based staggered-grid finite-difference method is proposed. Two new parameters, the modulated time and modulated range are used in the new window function and by adjusting these two parameters we obtain different characteristics of the main and side lobes of the amplitude response. Numerical dispersion analysis and elastic wavefield forward modeling suggests that the CMBWF method is more precise and less computationally costly than the conventional Taylor series expansion staggered-grid finite-difference method. 展开更多
关键词 Elastic wave staggered grid window function cosine modulate
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A truncated implicit high-order finite-difference scheme combined with boundary conditions 被引量:2
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作者 常锁亮 刘洋 《Applied Geophysics》 SCIE CSCD 2013年第1期53-62,118,共11页
In this paper, first we calculate finite-difference coefficients of implicit finite- difference methods (IFDM) for the first and second-order derivatives on normal grids and first- order derivatives on staggered gri... In this paper, first we calculate finite-difference coefficients of implicit finite- difference methods (IFDM) for the first and second-order derivatives on normal grids and first- order derivatives on staggered grids and find that small coefficients of high-order IFDMs exist. Dispersion analysis demonstrates that omitting these small coefficients can retain approximately the same order accuracy but greatly reduce computational costs. Then, we introduce a mirrorimage symmetric boundary condition to improve IFDMs accuracy and stability and adopt the hybrid absorbing boundary condition (ABC) to reduce unwanted reflections from the model boundary. Last, we give elastic wave modeling examples for homogeneous and heterogeneous models to demonstrate the advantages of the proposed scheme. 展开更多
关键词 Implicit finite difference symmetric boundary condition high-order accuracy TRUNCATION absorbing boundary condition staggered grid numerical modeling
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Variable-order rotated staggered-grid method for elastic-wave forward modeling
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作者 王为中 胡天跃 +3 位作者 吕雪梅 秦臻 李艳东 张研 《Applied Geophysics》 SCIE CSCD 2015年第3期389-400,468,共13页
Numerical simulations of a seismic wavefield are important to analyze seismic wave propagation. Elastic-wave equations are used in data simulation for modeling migration and imaging. In elastic wavefield numerical mod... Numerical simulations of a seismic wavefield are important to analyze seismic wave propagation. Elastic-wave equations are used in data simulation for modeling migration and imaging. In elastic wavefield numerical modeling, the rotated staggered-grid method (RSM) is a modification of the standard staggered-grid method (SSM). The variable-order method is based on the method of variable-length spatial operators and wavefield propagation, and it calculates the real dispersion error by adapting different finite-difference orders to different velocities. In this study, the variable-order rotated staggered-grid method (VRSM) is developed after applying the variable-order method to RSM to solve the numerical dispersion problem of RSM in low-velocity regions and reduce the computation cost. Moreover, based on theoretical dispersion and the real dispersion error of wave propagation calculated with the wave separation method, the application of the original method is extended from acoustic to shear waves, and the calculation is modified from theoretical to time-varying values. A layered model and an overthrust model are used to demonstrate the applicability of VRSM. We also evaluate the order distribution, wave propagation, and computation time. The results suggest that the VRSM order distribution is reasonable and VRSM produces high-precision results with a minimal computation cost. 展开更多
关键词 Variable order rotated staggered grid DISPERSION shear wave time varying
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Impact of Impeller Stagger Angles on Pressure Fluctuation for a Double-Suction Centrifugal Pump 被引量:10
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作者 Da-Chun Fu Fu-Jun Wang +2 位作者 Pei-Jian Zhou Ruo-Fu Xiao Zhi-Feng Yao 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2018年第1期198-211,共14页
Pressure fluctuation may cause high amplitude of vibration of double-suction centrifugal pumps, but the impact of impeller stagger angles is still not well understood. In this paper, pressure fluctuation experiments a... Pressure fluctuation may cause high amplitude of vibration of double-suction centrifugal pumps, but the impact of impeller stagger angles is still not well understood. In this paper, pressure fluctuation experiments are carried out for five impeller configurations with different stagger angles by using the same test rig system. Results show that the stagger angles exert negligible effects on the characteristics of head and efficiency. The distributions of pressure fluctuations are relatively uniform along the suction chamber wall, and the maximum pressure fluctuation amplitude is reached near the suction inlet tongue region. The pressure fluctuation characteristics are affected largely by impeller rotation, whose dominant frequencies include impeller rotation frequency and its harmonic frequencies, and half blade passage frequency. The stagger angle exerts a small effect on the pressure fluctuations in the suction chamber while a great effect on the pressure fluctuation in volute casing, especially on the aspect of decreasing the amplitude on blade passage frequency. Among the tested cases, the distribution of pressure fluctuations in the volute becomes more uniform than the other impeller configurations and the level of pressure fluctuation may be reduced by up to 50% when the impeller stagger angle is close to 24° or 360°.The impeller structure pattern needs to be taken into consideration during the design period, and the halfway staggered impeller is strongly recommended. 展开更多
关键词 Double-suction centrifugal pump Impeller stagger angle Pressure fluctuation Frequency spectra analysis
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