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Measurement and simulation of the two-phase velocity correlation in sudden-expansion gas-particle flows 被引量:3
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作者 Li-Xing Zhou.Yang Liu.Yi Xu Department of Engineering Mechanics,Tsinghua University,100084 Beijing,China Marine Engineering College,Dalian Maritime University,116026 Dalian,China 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2011年第4期494-501,共8页
In this paper the present authors measured the gas-particle two-phase velocity correlation in sudden expansion gas-particle flows with a phase Doppler particle anemometer (PDPA) and simulated the system behavior by ... In this paper the present authors measured the gas-particle two-phase velocity correlation in sudden expansion gas-particle flows with a phase Doppler particle anemometer (PDPA) and simulated the system behavior by using both a Reynolds-averaged Navier-Stokes (RANS) model and a large-eddy simulation (LES). The results of the measurements yield the axial and radial time-averaged velocities as well as the fluctuation velocities of gas and three particle-size groups (30μm, 50μm, and 95μm) and the gasparticle velocity correlation for 30μm and 50μm particles. From the measurements, theoretical analysis, and simulation, it is found that the two-phase velocity correlation of sudden-expansion flows, like that of jet flows, is less than the gas and particle Reynolds stresses. What distinguishes the two-phase velocity correlations of sudden-expansion flow from those of jet and channel flows is the absence of a clear relationship between the two-phase velocity correlation and particle size in sudden-expansion flows. The measurements, theoretical analysis, and numerical simulation all lead to the above-stated conclusions. Quantitatively, the results of the LES are better than those of the RANS model. 展开更多
关键词 PDPA measurement - Simulation Two-phasevelocity correlation sudden expansion gas-particle flows
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EXPERIMENTAL STUDIES ON SWIRLING AND RECIRCULATING TWO-PHASE FLOW FIELD IN A COLD MODEL OF DUAL-INLET SUDDEN-EXPANSION COMBUSTOR 被引量:1
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作者 周力行 李荣先 廖昌明 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2000年第4期193-197,共5页
The axial and tangential velocities of gas and particle phases and particle concentration for turbulent swirling and recirculating gas-particle (simulating gas-droplet) flows in a cold model of a dual-inlet sudden-exp... The axial and tangential velocities of gas and particle phases and particle concentration for turbulent swirling and recirculating gas-particle (simulating gas-droplet) flows in a cold model of a dual-inlet sudden-expansion combustor with partially tangential central tubes, proposed by the present authors, were measured by using a 2-D LDV system and a laser optic fiber system combined with a sampling probe. The results show that there are both gas and particle strongly reverse flows and swirling flows in the head part of the combustor. The velocity slip between gas and particle phases is remarkable. The particle concentration is higher near the wall and lower near the axis. There are two peaks in the concentration profiles near the inlet tubes. The above-obtained flow characteristics are favorable to ignition, flame stabilization and combustion. The results can also be used to validate the numerical modeling. 展开更多
关键词 swirling and recirculating flows gas-particle flows sudden-expansion combustor LDV measurements experimental studies
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Non-Newtonian Two-Phase Flow Characteristics across Sudden Expansion in Horizontal Rectangular Minichannel 被引量:1
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作者 Agus Santoso Daiki Goto +3 位作者 Tomoaki Takehira Ahmad Aslam Akimaro Kawahara Michio Sadatomi 《World Journal of Mechanics》 2016年第8期257-272,共17页
In the present paper, in order to clarity the effects of non-Newtonian liquid properties on the flow, similar experiments have been conducted for that of 0.4 wt% polyacrylamide (PAM) aqueous solutions as the working l... In the present paper, in order to clarity the effects of non-Newtonian liquid properties on the flow, similar experiments have been conducted for that of 0.4 wt% polyacrylamide (PAM) aqueous solutions as the working liquid, and air as the working gas. Liquid single-phase and air-liquid two-phase flow experiments were conducted at room temperature using the horizontal rectangular mini-channel with a sudden expansion. The cross-sectional dimensions of the narrow channel upstream from the sudden expansion were 2.79 mm, 3.09 mm and 2.94 mm in the height (H), the width (W) and the hydraulic diameter (DH), while those for the wide channel were 2.95 mm, 5.98 mm and 3.95 mm. The pressure distributions in the channels upstream and downstream from the expansion were measured with calibrated pressure transducer to determine the pressure change due to the expansion. The flow pattern, the bubble velocity, the bubble length, and the void fraction were measured with a high-speed video camera. The flow pattern map is drawn from the observed flow pattern, i.e., bubble flow, slug flow and annular flow in both the wide and the narrow channels. The bubble length data were compared with the calculation by the scaling law proposed by Kanezaki et al. and Kawahara et al. The pressure change data at the expansion were compared with our previous data together with several correlations in literature. Results of such experiment and comparisons are reported in the present paper. 展开更多
关键词 Non-Newtonian Two-Phase flow sudden expansion MINICHANNEL
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Platelet adhesion to the surface of a sudden tubular expansion tube under swirling flow condition
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作者 Fan ZHAN,Xiaoyan DENG,Yubo FAN(School of Biological Science&Medical Engineering,Beihang University,Beijing,100191,China) 《医用生物力学》 EI CAS CSCD 2009年第S1期22-22,共1页
The size mismatch in an end-to-end vascular anastomosis between the host vessel and the graft may cause flow disturbance and predispose to thrombosis [1].Although a number of techniques have been employed to reduce th... The size mismatch in an end-to-end vascular anastomosis between the host vessel and the graft may cause flow disturbance and predispose to thrombosis [1].Although a number of techniques have been employed to reduce the risk of anastomotic thrombosis due to the size mismatch。 展开更多
关键词 flow Platelet adhesion to the surface of a sudden tubular expansion tube under swirling flow condition
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Homotopy analysis solutions for the asymmetric laminar flow in a porous channel with expanding or contracting walls 被引量:7
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作者 X.-H. Si L.-C. Zheng +1 位作者 X.-X. Zhang Y. Chao 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2011年第2期208-214,共7页
In this paper, the asymmetric laminar flow in a porous channel with expanding or contracting walls is investigated. The governing equations are reduced to ordinary ones by using suitable similar transformations. Homot... In this paper, the asymmetric laminar flow in a porous channel with expanding or contracting walls is investigated. The governing equations are reduced to ordinary ones by using suitable similar transformations. Homotopy analysis method (HAM) is employed to obtain the expres- sions for velocity fields. Graphs are sketched for values of parameters and associated dynamic characteristics, especially the expansion ratio, are analyzed in detail. 展开更多
关键词 Homotopy analysis method · Expanding or contracting wall · Asymmetric laminar flow · Porous channel · expansion ratio
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Oxygen transfer characteristics of water and bubble mixture pipe flow through two sudden contractions and expansions 被引量:1
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作者 尹则高 解绍华 +1 位作者 程东升 龙翔宇 《Journal of Hydrodynamics》 SCIE EI CSCD 2014年第5期745-750,共6页
The dissolved oxygen (DO) concentration is an important index of water quality. This paper studies the dissolved oxygen recovery of the water and bubble mixture pipe flow through two sudden contractions and expansio... The dissolved oxygen (DO) concentration is an important index of water quality. This paper studies the dissolved oxygen recovery of the water and bubble mixture pipe flow through two sudden contractions and expansions. A 3-D computational fluid dy- namics model is established to simulate the water and bubble mixture flow with a DO transport model. An experiment is conducted to validate the mathematical model. The mathematical model is used to evaluate the effect of geometric parameters on the head loss coefficient, the relative saturation coefficient and the oxygen absorption efficiency. It is found that the contraction ratio is a signi- ficant influencing factor, other than the relative length and the relative distance. Given the same relative length and relative distance, the head loss coefficient, the relative saturation coefficient and the oxygen absorption efficiency increase with the decrease of the contraction ratio, respectively. Given the same relative length and contraction ratio, the head loss coefficient increases with the in- crease of the relative distance firstly, and then decreases gradually, in contrast, the relative saturation coefficient and the oxygen ab- sorption efficiency decrease with the increase of the relative distance firstly, and then increase gradually, the relative saturation coefficient and the oxygen absorption efficiency are inversely proportional to the head loss coefficient, respectively. 展开更多
关键词 dissolved oxygen two sudden contractions and expansions head loss coefficient relative saturation coefficient oxygen absorption efficiency
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Flow patterns and their transition characteristics of the air-water two-phase flow in a horizontal pipe with a sudden-changed cross-section area
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作者 YANG Ying-Zhen LI Guang-Jun +3 位作者 ZHOU Fang-De CREN Xue-Jun (State Key Laboratory of Multiphase Flow in Power Engineering, Xi ’an Jiaotong University, Xi’an, 710049 Northwest Poaer Design Institute, Xi’an, 710068 School of Chemical Engineering, University 《Nuclear Science and Techniques》 SCIE CAS CSCD 2001年第1期44-52,共9页
Flow patterns in upstream and downstream straight tubes of sudden-changed areas in a horizontal straight pipe were experimentally examined. Both sudden-expansion cross-section (SECS) and sudden-contraction cross-secti... Flow patterns in upstream and downstream straight tubes of sudden-changed areas in a horizontal straight pipe were experimentally examined. Both sudden-expansion cross-section (SECS) and sudden-contraction cross-section (SCCS) were investigated. The flow pattern maps upstream and downstream were delineated and compared with those in straight tubes with uniform cross-sections. The effects of the SECS and SCCS on flow patterns were discussed and analyzed. Furthermore, flow pattern transition mechanisms resulting in occurrences of different flow patterns were simply discussed and some transition criteria for the flow pattern transitions were deduced by using the non-dimensionlized analysis method. 展开更多
关键词 气水二相流 水平管 相变特征 流图样
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Adsorption of phosphorus in sediment re-suspension under sudden expansion flow conditions 被引量:3
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作者 LIANG Wen WANG Ze +1 位作者 JIAO Zeng-xiang WAN Jun 《Journal of Hydrodynamics》 SCIE EI CSCD 2013年第1期112-117,共6页
Based on the study of hydraulic characteristics of the sudden expansion water flow of an annular flume, this paper determines the vertical velocity distribution and the turbulence intensity distribution in the mainstr... Based on the study of hydraulic characteristics of the sudden expansion water flow of an annular flume, this paper determines the vertical velocity distribution and the turbulence intensity distribution in the mainstream and the recirculation regions to analyze the basic features of this flow field. The adsorption of the phosphorus in the sediment is studied by adding the bacteriostatic agent. The results show that the flow speed in the mainstream region is higher than that in the recirculation region. However, the turbulence intensity in the recirculation region increases more than that in the mainstream region. The adsorption of the phosphorus in the sediment includes the physisorption and the biosorption, and the former is stronger than the latter. With the biosorption in the phosphorus removal process, the phosphorus released by the sediment is mainly completed by the poly-P bacteria in the anaerobic condition. The adsorption of the phosphorus in the sediment in the mainstream region of a sudden expansion water flow is strong and stable, whereas the adsorption in the sediment in the recirculation region is largely fluctuated. 展开更多
关键词 sudden expansion flow SEDIMENT PHOSPHORUS adsorption effect
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Characteristics of pressure drop for singlephase and two-phase flow across sudden contraction in microtubes 被引量:1
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作者 LI Zhuo YU Jian MA ChongFang 《Science China(Technological Sciences)》 SCIE EI CAS 2008年第2期162-169,共8页
Single-phase and gas-liquid two-phase pressure drops caused by a sudden con-traction in microtubes were experimentally investigated at room temperature and atmospheric pressure,using nitrogen and water. The experiment... Single-phase and gas-liquid two-phase pressure drops caused by a sudden con-traction in microtubes were experimentally investigated at room temperature and atmospheric pressure,using nitrogen and water. The experimental results on pressure drop with a novel measurement method,the tiny gaps on the tubes,were used to characterize the sudden contraction pressure drop for tube diameters from 850 to 330 μm. The ranges of the gas and liquid superficial velocity were 2.55―322.08 and 0.98―9.78 m/s in the smaller tube respectively. In single-phase flow experiments,the contraction loss coefficients were larger than the experimental results from conventional tubes in the laminar flow. While in the turbulent flow,the contraction loss coefficients were slightly smaller than those from conventional tubes and predicted well by Kc=0.5×(1-σ2)0.75. In two-phase flow experiments,the slip flow model with a velocity slip ratio S=(ρL/ρG)1/3 showed a good prediction that reveals the occurrence of velocity slip. An empirical correlation for two-phase flow pressure drops caused by the sudden contraction was developed based on the proposed contraction loss coefficients correlation for single-phase flow and Mar-tinelli factor. 展开更多
关键词 MICROTUBE sudden contraction pressure measurement loss COEFFICIENTS single-and TWO-PHASE flow
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Pressure recovery characteristics for a dilute gas-particle suspension flowing vertically downward in a pipe with a sudden expansion: A two-fluid modeling approach 被引量:2
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作者 Santosh Kumar Senapati Sukanta Kumar Dash 《Particuology》 SCIE EI CAS CSCD 2020年第3期100-111,共12页
This work applies the Eulerian-Eulerian model in conjunction with the kinetic theory of granular flow and inter-particle collisions to study the characteristics of pressure recovery for a dilute gas-particle suspensio... This work applies the Eulerian-Eulerian model in conjunction with the kinetic theory of granular flow and inter-particle collisions to study the characteristics of pressure recovery for a dilute gas-particle suspension flowing through a pipe with a sudden expansion at a relatively higher solid loading.To do so,the numerical procedure was validated against experimental results for relatively small dilute phase flows in a pipe with a sudden expansion;a satisfactory agreement was obtained.Initially,the effect of the two significant numerical parameters namely,the speculairty coefficient and the coefficient of restitution for particle-particle collisions were investigated and then,for fixed combinations of these parameters the effect of particle-phase volume fraction,particle density,particle size,and inlet slip ratio were studied.It was concluded that pressure recovery diminishes as the speculairty coefficient increases and the particle-particle coefficient of restitution decreases.Pressure recovery was found to increase with increasing solid volume fraction for coarse particles whereas,for fine particles,a critical volume fraction is obtained above which pressure recovery reduces.An increase in slip ratio is found to diminish pressure recovery.Similarly,at relatively higher solid volume fractions,a critical diameter was found,above and below which pressure recovery decreases. 展开更多
关键词 Gas-solid flow sudden expansion pipe Eulerian-Eulerian model Pressure recovery Vertically downward flow
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Numerical Studies of Turbulent Flows in Channels with Abrupt Cross-sectional Changes
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作者 CHEN Hao-liang LIN Quan-hong +1 位作者 Cheong Hin Fatt LIN Peng-zhi 《南水北调与水利科技》 CAS CSCD 北大核心 2013年第1期J0007-J0015,共9页
The turbulent flows through the channels with abrupt cross-sectional changes are common and importantphysical process in nature.For a better prediction of the mean flow and turbulent characteristics for this problem,a... The turbulent flows through the channels with abrupt cross-sectional changes are common and importantphysical process in nature.For a better prediction of the mean flow and turbulent characteristics for this problem,atwo-dimensional depth-averaged numerical model is developed.The model is robust and accurate in reproducing therecirculation flow behind a groyne and turbulent flows in channels with abrupt cross-sectional changes,when com-pared to the available experimental data of mean velocities and turbulence kinetic energy.Our results reveal that theabrupt cross-sectional change of a channel can affect the flow pattern significantly and introduces the complex turbu-lence characteristics.In particular,when the channel has an abrupt expansion,the mean flow pattern is mainly in lon-gitudinal direction with rather small transverse component.Meanwhile,a recirculating region forms behind the expan-sion position and the turbulence has very strong intensity within this region.For the flow in the channel with an ab-rupt contraction,the longitudinal component of the flow is decreased by the obstruction on one side and accelerated onthe other side,whereas the transverse velocity is small.The turbulence is extraordinarily strong in the regions adja-cent to the contraction wall in the narrow channel.In both cases of abrupt cross-sectional changes,the TKE is genera-ted dominantly by the shear of the longitudinal velocities. 展开更多
关键词 TURBULENT flow open channel ABRUPT expansion ABRUPT contraction SHALLOW water equation
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Experimental investigation of tubing collar's influence on hydrodynamic behavior of annular duct flow
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作者 Yi-Su Zhou Zhong-Wei Huang +3 位作者 Zhuang-Zhuang Zhang Tian-Wen Jiang Rui-Yue Yang Ming-He Zhang 《Petroleum Science》 SCIE CAS CSCD 2022年第5期2326-2342,共17页
Tubing collars’influence on hydrodynamic behavior of annular duct flow has been investigated using Particle Image Velocity(PIV)technology.PIV has become an efficient method for complex transient flows visualization.A... Tubing collars’influence on hydrodynamic behavior of annular duct flow has been investigated using Particle Image Velocity(PIV)technology.PIV has become an efficient method for complex transient flows visualization.A water flow loop with two replaceable variable cross-sections(VCS),75-90 mm and 90-110 mm,in a 129 mm inner diameter(ID)pipe was used.The whole field of the variable cross-section annulus(VCSA)was visualized,including forward-facing step(FFS),narrow annulus(NA),and backwardfacing step(BFS)flow.The VCSA ratio and Reynolds(Re)number influence on streamline distribution,velocity distribution,and turbulence intensity were discussed.Results showed that the recirculation is easier to form in BFS than FFS flow under the same condition.The VCSA ratio affects the formation of recirculation zones and the location of the reattachment point.Reynolds number mainly affects BFS flow by influencing the main velocity component-axial velocity.The turbulence intensity is relatively high in BFS than FFS flow and is larger at y/h>1.0 than y/h<1.0.Furthermore,the streamwise cohere nt structures reveal that the first two modes are predominant and represent the main characteristics of the flow by proper orthogonal decomposition(POD)method. 展开更多
关键词 Variable cross-section annulus flow sudden contraction and expansion Hydrodynamic behavior PIV POD
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阀后管道突扩对控制阀门流阻特性的影响 被引量:3
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作者 王蛟 胡亚安 +1 位作者 陈亮 王召兵 《流体机械》 CSCD 北大核心 2024年第1期41-47,共7页
为准确地描述非均匀流条件下控制阀门阀后采用突扩管道后的流阻特性,针对典型控制阀门(活塞式调流阀与固定式锥形阀),采用物理模型试验与理论分析方法,基于阀后突扩管道内的流场结构及试验段压力特性,研究阀后管道突扩对典型控流调压阀... 为准确地描述非均匀流条件下控制阀门阀后采用突扩管道后的流阻特性,针对典型控制阀门(活塞式调流阀与固定式锥形阀),采用物理模型试验与理论分析方法,基于阀后突扩管道内的流场结构及试验段压力特性,研究阀后管道突扩对典型控流调压阀门流阻特性的影响规律。结果表明,不同阀型采用相同突扩体时的流阻特性变化程度不同,阀型的影响主要体现在改变了突扩体的入流、出流条件。在规范公式的基础上,考虑阀门出流流场结构(突扩体入流条件)与水流缩脉(突扩体出流条件)的影响,分析得到管道突扩比与阀门流量系数的定量关系,规范计算值与试验值的最大差异约为8%,优化公式计算值与试验值最大差异约为1%,说明改进后的突扩体流阻系数公式的计算精度较规范公式有所提高。研究结果可为高压差、大流量调流调压系统管路设计提供参考。 展开更多
关键词 控制阀门 突扩体 流量系数 流场结构 水流缩脉
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二级环流反应器中收缩-膨胀隔板的性能优化
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作者 卢哲 史嘉帧 +2 位作者 郭凯 刘春江 郑龙云 《化学工业与工程》 CAS CSCD 北大核心 2024年第1期125-135,共11页
通过在二级环流反应器两级之间安装具有收缩-膨胀形状的隔板,可以有效减小两级之间的液相回流流量,但同时会增加流体流动阻力。为了在减小液相回流流量的前提下减小流动阻力,本研究对隔板进行优化设计。首先通过模拟计算获得不同隔板下... 通过在二级环流反应器两级之间安装具有收缩-膨胀形状的隔板,可以有效减小两级之间的液相回流流量,但同时会增加流体流动阻力。为了在减小液相回流流量的前提下减小流动阻力,本研究对隔板进行优化设计。首先通过模拟计算获得不同隔板下的压降和液相回流流量,随后对数据进行拟合,得到压降、液相回流流量与结构参数的关联式。计算结果表明当表观气速较小时,隔板宽度对压降影响较大,高度的影响较小。表观气速增大时,隔板高度对压降的影响变大。在所有气速下,隔板宽度是影响液相回流流量的决定因素。最后通过多目标优化,获得了在不同表观气速下最优隔板的Pareto前沿。 展开更多
关键词 收缩-膨胀隔板 优化 二级气升式环流反应器 气液两相流 计算流体力学
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EXPERIMENTAL INVESTIGATION OF CAVITATION IN A SUDDEN EXPANSION PIPE 被引量:3
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作者 ZHANG Jian-min YANG Qing WANG Yu-rong XU Wei-lin CHEN Jian-gang 《Journal of Hydrodynamics》 SCIE EI CSCD 2011年第3期348-352,共5页
For sudden expansion pipes, experiments were carried 'Out to study the cavitation inception for various enlargement ratios in high speed flows. The flow velocity of the prototype reaches 50 m/s in laboratory. The rel... For sudden expansion pipes, experiments were carried 'Out to study the cavitation inception for various enlargement ratios in high speed flows. The flow velocity of the prototype reaches 50 m/s in laboratory. The relationship between the expansion ratio and the incipient cavitation number is obtained. The scale and velocity effects are revealed. It is shown that Keller's revised formula should be modified to calculate the incipient cavitation number when the forecasted velocity of the flows in the prototype exceeds the experimental velocity. 展开更多
关键词 high speed flows sudden expansion pipe cavitation incipient scale effect
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突扩整流孔板设计与多孔孔板尾迹发展的数值模拟
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作者 但汉攀 薛临风 +3 位作者 丁骏 汪旦军 蓝吉兵 郑健生 《动力工程学报》 CAS CSCD 北大核心 2024年第11期1804-1810,共7页
为了研究压气机试验台进气系统突扩流动孔板的整流效果,设计了4套不同布局的孔板。采用数值模拟方法研究了突扩流动核心区域(简称“中心区域”)开孔率和整个孔板孔分布对多孔孔板尾迹流和主流掺混过程的影响。结果表明:中心区域开孔率... 为了研究压气机试验台进气系统突扩流动孔板的整流效果,设计了4套不同布局的孔板。采用数值模拟方法研究了突扩流动核心区域(简称“中心区域”)开孔率和整个孔板孔分布对多孔孔板尾迹流和主流掺混过程的影响。结果表明:中心区域开孔率增大会使孔板四周区域分流不足,当中心区域开孔率增大到突扩上下游截面面积比的1.46倍时,中心区域分流流量占比达到其面积占比的1.88倍,稳压箱近壁面区域和角区尾迹涡合并增大,长度达到孔间距的17~24倍;为抑制近壁面区域和角区尾迹涡增大和变长,选取中心区域开孔率与突扩上下游截面面积比相当为宜;缩短中心区域孔后尾迹涡长度的最有效方法是缩小孔间距。 展开更多
关键词 突扩流动 多孔孔板 整流 尾迹涡
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小通道单相流体突扩和突缩局部阻力特性 被引量:16
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作者 李卓 俞坚 马重芳 《化工学报》 EI CAS CSCD 北大核心 2007年第5期1127-1131,共5页
采用缝隙测压这种在通道上直接测量压力的方法,测量了内径从0.330mm变化到0.580mm的小通道内突然扩大和突然缩小的局部阻力特性。结果表明,缝隙测压方式是一种可行的压力测量方法;与常规通道的实验结果相比,在层流阶段,小通道内液体流... 采用缝隙测压这种在通道上直接测量压力的方法,测量了内径从0.330mm变化到0.580mm的小通道内突然扩大和突然缩小的局部阻力特性。结果表明,缝隙测压方式是一种可行的压力测量方法;与常规通道的实验结果相比,在层流阶段,小通道内液体流动具有较小的突扩局部阻力系数以及较大的突缩局部阻力系数;而在湍流阶段,小通道内液体流动的突扩和突缩局阻系数与常规通道的实验结果相同。 展开更多
关键词 小通道 突扩 突缩 阻力系数 缝隙测压
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水平突变管内油水两相流数值模拟 被引量:3
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作者 范开峰 王卫强 +2 位作者 孙策 石海涛 万宇飞 《石油化工高等学校学报》 CAS 2014年第2期84-87,共4页
采用计算流体力学中VOF模型对水平突扩管和突缩管内油水两相流进行数值模拟,两相流中原油为中质稠油并且含水率较高,从50%到80%不等。结果表明,不同含水率油水两相流在突扩管和突缩管内主要为水包油流型,在管径突变处压力波动变化明显,... 采用计算流体力学中VOF模型对水平突扩管和突缩管内油水两相流进行数值模拟,两相流中原油为中质稠油并且含水率较高,从50%到80%不等。结果表明,不同含水率油水两相流在突扩管和突缩管内主要为水包油流型,在管径突变处压力波动变化明显,但含水率从50%变化到80%时对压力变化趋势影响较小。得到的不同含水率油水两相流在突变管径管道中的流动规律,可为原油集输管网油水两相流混输问题提供参考。 展开更多
关键词 突扩管 突缩管 油水两相流 VOF模型 压力变化 流动规律
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连续突扩管流的数值模拟 被引量:11
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作者 尹则高 张土乔 +1 位作者 黄亚东 吴小刚 《流体机械》 CSCD 北大核心 2005年第8期24-27,共4页
针对二阶连续突扩管流,分析研究了紊动水流运动特点,建立了标准k-ε紊流数学模型,编制了计算程序,并利用物理模型试验资料对其进行了验证;利用模型对二阶连续突扩管流水头损失进行计算,分析结果表明,当中间管段的长径比在3~4左右时,相... 针对二阶连续突扩管流,分析研究了紊动水流运动特点,建立了标准k-ε紊流数学模型,编制了计算程序,并利用物理模型试验资料对其进行了验证;利用模型对二阶连续突扩管流水头损失进行计算,分析结果表明,当中间管段的长径比在3~4左右时,相对水头损失系数最小,可以为连续突扩管道的设计提供相关参考依据. 展开更多
关键词 连续突扩管流 数值模拟 k-ε数学模型 水头损失
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突扩管分离流场的数值模拟 被引量:14
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作者 赵海燕 贾雪松 +1 位作者 杨士梅 郝明 《科学技术与工程》 2009年第17期5238-5240,共3页
边界突然扩大的流动在管道输运工程中是一种常见的流动现象,管道的设计对节能及生产成本的降低起着至关重要的作用。利用计算流体力学(CFD)中的FLUENT软件对突扩管路牛顿流体层流情况进行数值模拟,并通过后处理软件Tec-plot和Origin对... 边界突然扩大的流动在管道输运工程中是一种常见的流动现象,管道的设计对节能及生产成本的降低起着至关重要的作用。利用计算流体力学(CFD)中的FLUENT软件对突扩管路牛顿流体层流情况进行数值模拟,并通过后处理软件Tec-plot和Origin对模拟结果做了数据处理,给出了不同雷诺数和不同突扩比情况下的突扩管分离流场的流线图,分析了它们对突扩管流的影响。结果可以很好的反映突扩管流的基本特征,为工业生产中常见的此类问题的研究提供了理论依据和分析方法。 展开更多
关键词 突扩流 FLUENT 数值模拟 流线
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