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Second-order modeling of non-premixed turbulent methane-air combustion
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作者 Ali ERSHADI Mehran RAJABI ZARGARABADI 《Journal of Central South University》 SCIE EI CAS CSCD 2021年第11期3545-3555,共11页
The main purpose of this research is the second-order modeling of flow and turbulent heat flux in nonpremixed methane-air combustion.A turbulent stream of non-premixed combustion in a stoichiometric condition,is numer... The main purpose of this research is the second-order modeling of flow and turbulent heat flux in nonpremixed methane-air combustion.A turbulent stream of non-premixed combustion in a stoichiometric condition,is numerically analyzed through the Reynolds averaged Navier-Stokes(RANS) equations.For modeling radiation and combustion,the discrete ordinates(DO) and eddy dissipation concept model have been applied.The Reynolds stress transport model(RSM) also was used for turbulence modeling.For THF in the energy equation,the GGDH model and high order algebraic model of HOGGDH with simple eddy diffusivity model have been applied.Comparing the numerical results of the SED model(with the turbulent Prandtl 0.85) and the second-order heat flux models with available experimental data follows that applying the second-order models significantly led to the modification of predicting temperature distribution and species mass fraction distribution in the combustion chamber.Calculation of turbulent Prandtl number in the combustion chamber shows that the assumption of Pr_(t) of 0.85 is far from reality and Pr_(t) in different areas varies from 0.4 to 1.2. 展开更多
关键词 combustion modeling turbulent Prandtl number second-order models Reynolds stress transport model
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NUMERICAL SIMULATION OF METHANE-AIR TURBULENT JET FLAME USING A NEW SECOND-ORDER MOMENT MODEL 被引量:4
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作者 陈兴隆 周力行 张健 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2000年第1期41-47,共7页
A new second-order moment model for turbulent combustion is applied in the simulation of methane-air turbulent jet flame. The predicted results are compared with the experimental results and with those predicted using... A new second-order moment model for turbulent combustion is applied in the simulation of methane-air turbulent jet flame. The predicted results are compared with the experimental results and with those predicted using the well-known EBU-Arrhenius model and the original second-order moment model. The comparison shows the advantage of the new model that it requires almost the same computational storage and time as that of the original second-order moment model, but its modeling results are in better agreement with experiments than those using other models. Hence, the new second-order moment model is promising in modeling turbulent combustion with NOx formation with finite reaction rate for engineering application. 展开更多
关键词 turbulent combustion second-order moment model numerical simulation
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Comparison of a Full Second-Order Moment Model and an Algebraic Stress Two-Phase Turbulence Model for Simulating Bubble-Liquid Flows in a Bubble Column 被引量:3
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作者 周力行 杨玟 +2 位作者 廉春英 L.S.Fan D.J.Lee 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2002年第2期142-148,共7页
A full second-order moment (FSM) model and an algebraic stress (ASM) two-phase turbulence modelare proposed and applied to predict turbulent bubble-liquid flows in a 2D rectangular bubble column. Predictiongives the b... A full second-order moment (FSM) model and an algebraic stress (ASM) two-phase turbulence modelare proposed and applied to predict turbulent bubble-liquid flows in a 2D rectangular bubble column. Predictiongives the bubble and liquid velocities, bubble volume fraction, bubble and liquid Reynolds stresses and bubble-liquidvelocity correlation. For predicted two-phase velocities and bubble volume fraction there is only slight differencebetween these two models, and the simulation results using both two models are in good agreement with the particleimage velocimetry (PIV) measurements. Although the predicted two-phase Reynolds stresses using the FSM are insomewhat better agreement with the PIV measurements than those predicted using the ASM, the Reynolds stressespredicted using both two models are in general agreement with the experiments. Therefore, it is suggested to usethe ASM two-phase turbulence model in engineering application for saving the computation time. 展开更多
关键词 second-order moment model two-phase turbulence bubble-liquid flow bubble column
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A two-scale second-order moment two-phase turbulence model for simulating dense gas-particle flows 被引量:4
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作者 Zhuoxiong Zeng Lixing Zhou Jian Zhang 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2005年第5期425-429,共5页
A two-scale second-order moment two-phase turbulence model accounting for inter-particle collision is developed, based on the concepts of particle large-scale fluctuation due to turbulence and particle small-scale flu... A two-scale second-order moment two-phase turbulence model accounting for inter-particle collision is developed, based on the concepts of particle large-scale fluctuation due to turbulence and particle small-scale fluctuation due to collision and through a unified treatment of these two kinds of fluctuations. The proposed model is used to simulate gas-particle flows in a channel and in a downer. Simulation results are in agreement with the experimental results reported in references and are near the results obtained using the sin- gle-scale second-order moment two-phase turbulence model superposed with a particle collision model (USM-θ model) in most regions. 展开更多
关键词 Gas-particle flows .second-order moment model . Two-scale fluctuation
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EFFECT OF EMPIRICAL COEFFICIENTS ON SIMULATION IN TWO-SCALE SECOND-ORDER MOMENT PARTICLE-PHASE TURBULENCE MODEL
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作者 胡春波 曾卓雄 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2006年第11期1491-1497,共7页
A two-scale second-order moment two-phase turbulence model accounting for inter-particle collision is developed, based on the concept of particle large-scale fluctuation due to turbulence and particle small-scale fluc... A two-scale second-order moment two-phase turbulence model accounting for inter-particle collision is developed, based on the concept of particle large-scale fluctuation due to turbulence and particle small-scale fluctuation due to collision. The proposed model is used to simulate gas-particle downer reactor flows. The computational results of both particle volume fraction and mean velocity are in agreement with the experimental results. After analyzing effects of empirical coefficient on prediction results, we can come to a conclusion that, inside the limit range of empirical coefficient, the predictions do not reveal a large sensitivity to the empirical coefficient in the downer reactor, but a relatively great change of the constants has important effect on the prediction. 展开更多
关键词 two-phase flow second-order moment model two-scale fluctuation empirical coefficients
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SECOND-ORDER MOMENT MODEL FOR DENSE TWO-PHASE TURBULENT FLOW OF BINGHAM FLUID WITH PARTICLES
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作者 曾卓雄 周力行 刘志和 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2006年第10期1373-1381,共9页
The USM-θ model of Bingham fluid for dense two-phase turbulent flow was developed, which combines the second-order moment model for two-phase turbulence with the particle kinetic theory for the inter-particle collisi... The USM-θ model of Bingham fluid for dense two-phase turbulent flow was developed, which combines the second-order moment model for two-phase turbulence with the particle kinetic theory for the inter-particle collision. In this model, phases interaction and the extra term of Bingham fluid yield stress are taken into account. An algorithm for USM-θ model in dense two-phase flow was proposed, in which the influence of particle volume fraction is accounted for. This model was used to simulate turbulent flow of Bingham fluid single-phase and dense liquid-particle two-phase in pipe. It is shown USM-θ model has better prediction result than the five-equation model, in which the particle-particle collision is modeled by the particle kinetic theory, while the turbulence of both phase is simulated by the two-equation turbulence model. The USM-θ model was then used to simulate the dense two-phase turbulent up flow of Bingham fluid with particles. With the increasing of the yield stress, the velocities of Bingham and particle decrease near the pipe centre. Comparing the two-phase flow of Bingham-particle with that of liquid-particle, it is found the source term of yield stress has significant effect on flow. 展开更多
关键词 Bingham fluid two-phase flow yield stress second-order moment model
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Validation of the RANS-SOM Combustion Model Using Direct Numerical Simulation of Incompressible Turbulent Reacting Flows 被引量:1
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作者 王方 许春晓 周力行 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2008年第5期679-685,共7页
The second-order moment combustion model, proposed by the authors is validated using the direct numerical simulation (DNS) of incompressible turbulent reacting channel flows. The instantaneous DNS results show the n... The second-order moment combustion model, proposed by the authors is validated using the direct numerical simulation (DNS) of incompressible turbulent reacting channel flows. The instantaneous DNS results show the near-wall strip structures of concentration and temperature fluctuations. The DNS statistical results give the budget of the terms in the correlation equations, showing that the production and dissipation terms are most important. The DNS statistical data are used to validate the closure model in RANS second-order moment (SOM) combustion model. It is found that the simulated diffusion and production terms are in agreement with the DNS data in most flow regions, except in the near-wall region, where the near-wall modification should be made, and the closure model for the dissipation term needs further improvement. The algebraic second-order moment (ASOM) combustion model is well validated by DNS. 展开更多
关键词 second-order moment combustion model direct numerical simulation incompressible reacting flows
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湍流燃烧二阶矩模型DNS检验研究进展的回顾
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作者 王方 周力行 《燃烧科学与技术》 CAS CSCD 北大核心 2024年第6期570-574,共5页
现有的湍流燃烧模型中,有的缺乏普适性,也有的用于大涡模拟的计算量太大.一种基于湍流流动模拟思路的统计矩方法被提出来,称为二阶矩(second-order moment,SOM)燃烧模型,用于非预混射流火焰和旋流火焰的雷诺平均模拟(Reynolds-averaged ... 现有的湍流燃烧模型中,有的缺乏普适性,也有的用于大涡模拟的计算量太大.一种基于湍流流动模拟思路的统计矩方法被提出来,称为二阶矩(second-order moment,SOM)燃烧模型,用于非预混射流火焰和旋流火焰的雷诺平均模拟(Reynolds-averaged Navier-Stokes modeling,RANS)和大涡模拟(large-eddy simulation,LES),以及钝体后方预混火焰的大涡模拟,已经得到实验结果的良好检验.进一步的研究是该模型的直接数值模拟(direct numerical simulation,DNS)检验.本文对作者以及文献中报导的SOM模型DNS检验的研究进展进行了回顾. 展开更多
关键词 湍流燃烧 二阶矩燃烧模型 直接数值模拟检验
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Second-order moment modeling of dispersed two-phase turbulence——Part 1:USM,k-ε-k_p,and non-linear k-ε-k_p two-phase turbulence models 被引量:4
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作者 ZHOU LiXing 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2011年第6期1098-1107,共10页
Turbulent dispersed multiphase flows,including gas-particle,gas-droplet and bubble-liquid flows,are widely encountered in various engineering facilities.Modeling of two-phase turbulence,in particular the dispersed pha... Turbulent dispersed multiphase flows,including gas-particle,gas-droplet and bubble-liquid flows,are widely encountered in various engineering facilities.Modeling of two-phase turbulence,in particular the dispersed phase turbulence,is the key problem in the Eulerian-Eulerian simulation of practical dispersed multiphase flows.Although different models were developed and used,the experimental validation shows that they cannot always give satisfactory prediction results.In this paper the present author give a detailed review of the unified second-order moment (USM),k-k p and nonlinear k-k p two-phase turbulence models,proposed by him.The derivation and closure of these models are described in detail and the experimental validation and application of these models are extensively discussed. 展开更多
关键词 dispersed multiphase flows second-order moment model two-phase turbulence
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A nonlinear k_p-ε_p particle two-scale turbulence model and its application 被引量:3
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作者 Zhuoxiong Zeng Zhuozhi Zeng Yihua Xu 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2007年第6期621-625,共5页
A particle nonlinear two-scale kp-εp turbulence model is proposed for simulating the anisotropic turbulent two-phase flow. The particle kinetic energy equation for two-scale fluctuation, particle energy transfer rate... A particle nonlinear two-scale kp-εp turbulence model is proposed for simulating the anisotropic turbulent two-phase flow. The particle kinetic energy equation for two-scale fluctuation, particle energy transfer rate equation for large-scale fluctuation, and particle turbulent kinetic energy dissipation rate equation for small-scale fluctuation are derived and closed. This model is used to simulate gas-particle flows in a sudden-expansion chamber. The simulation is com- pared with the experiment and with those obtained by using another two kinds of tow-phase turbulence model, such as the single-scale k-ε two-phase turbulence model and the particle two-scale second-order moment (USM) two-phase turbulence model. It is shown that the present model gives simulation in much better agreement with the experiment than the single-scale k-ε two-phase turbulence model does and is almost as good as the particle two-scale USM turbu-lence model. 展开更多
关键词 Gas-particle flows second-order moment model Two-scale fluctuation
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A TWO-SCALE SECOND-ORDER MOMENT PARTICLE TURBULENCE MODEL FOR GAS-PARTICLE FLOW 被引量:5
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作者 ZENG Zhuo-xiong ZHOU Li-xing 《Journal of Hydrodynamics》 SCIE EI CSCD 2006年第6期659-665,共7页
A two-scale second-order moment two-phase turbulence model was developed and used to simulate gas-particle flow in a sudden-expansion chamber and a channel. The simulation results were in agreement with the experiment... A two-scale second-order moment two-phase turbulence model was developed and used to simulate gas-particle flow in a sudden-expansion chamber and a channel. The simulation results were in agreement with the experimental results, and the results were compared with those of the single-scale second-order moment two-phase turbulence model. Several improved features show that the two-scale model is to a certain extent better than the single-scale model, which may be attributed to the fact that particle turbulence is well characterized by the two-scale turbulence model. 展开更多
关键词 gas-particle flow second-order moment model two-scale fluctuation
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Second-order moment modeling of dispersed two-phase turbulence-Part 2-USM-Θ two-phase turbulence model and USM-SGS two-phase stress model 被引量:2
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作者 ZHOU LiXing 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2011年第7期1296-1303,共8页
Dense gas-particle flows are frequently encountered in fluidized beds,riser and downer reactors,pneumatic transport and the near-wall zone of dilute gas-particle flows.Particle-particle collision plays an important ro... Dense gas-particle flows are frequently encountered in fluidized beds,riser and downer reactors,pneumatic transport and the near-wall zone of dilute gas-particle flows.Particle-particle collision plays an important role in the behavior of two-phase flows.In this paper a USM-Q two-phase turbulence model for dense gas-particle flows is proposed to account for both two-phase turbulence and inter-particle collision.For two-fluid large-eddy simulation of gas-particle flows,the author proposed a unified second-order moment(USM) two-phase SGS stress model and a two-phase k-kp SGS energy-equation stress model.The proposed models can fully account for the interaction between the gas and particle SGS stresses. 展开更多
关键词 densed gas-particle flows second-order moment model two-phase turbulence large-eddy simulation
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TPDF-ASOM复合湍流燃烧模型及其检验
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作者 王方 杨子峥 +1 位作者 韩宇轩 金捷 《北京航空航天大学学报》 EI CAS CSCD 北大核心 2023年第12期3265-3282,共18页
先进航空发动机燃烧室设计要求对湍流火焰精确控制,现有模拟方法需提高精度和效率。输运概率密度函数(TPDF)湍流燃烧模型精度高,代数二阶矩(ASOM)湍流燃烧模型计算成本低,类比离散涡模拟思想,基于Da数将湍流燃烧场区分“高精度”和“低... 先进航空发动机燃烧室设计要求对湍流火焰精确控制,现有模拟方法需提高精度和效率。输运概率密度函数(TPDF)湍流燃烧模型精度高,代数二阶矩(ASOM)湍流燃烧模型计算成本低,类比离散涡模拟思想,基于Da数将湍流燃烧场区分“高精度”和“低成本”2个区域,在输运方程框架下采用随机场TPDF(高精度)和ASOM(低成本)方法重构TPDF-ASOM复合湍流燃烧模型,以提高模拟的整体精度和效率。在大涡模拟(LES)-TPDF程序平台创建ASOM并进一步实现TPDF-ASOM复合湍流燃烧模型,用Flame D实验数据检验所建模型和方法。结果表明:所建模型的预测结果与实验值接近,而且能够兼顾精度和计算效率。 展开更多
关键词 复合湍流燃烧模型 随机场输运概率密度函数-方程湍流燃烧模型 代数二阶矩湍流燃烧模型 Da数 Flame D
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Development of SOM combustion model for Reynolds-averaged and large-eddy simulation of turbulent combustion and its validation by DNS 被引量:9
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作者 ZHOU LiXing Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China 《Science China(Technological Sciences)》 SCIE EI CAS 2008年第8期1073-1086,共14页
The derivation and closure methods of the second-order moment (SOM) combus- tion model are proposed. The application of this model to Reynolds averaged (RANS) and large-eddy simulation (LES) of turbulent swirling diff... The derivation and closure methods of the second-order moment (SOM) combus- tion model are proposed. The application of this model to Reynolds averaged (RANS) and large-eddy simulation (LES) of turbulent swirling diffusion combustion, jet diffusion combustion, and bluff-body stabilized premixed combustion is sum- marized. It is indicated that the SOM model is much better than the eddy-beak-up (EBU) and presumed PDF models widely used in commercial software and engi- neering. The SOM modeling results are close to those obtained using the most accurate but much more complex PDF equation model. Moreover, it can save much more computation time than the PDF equation model. Finally, the SOM model is validated by the direct numerical simulation (DNS) of turbulent reacting channel flows. 展开更多
关键词 turbulent combustion second-order moment model REYNOLDS averaged SIMULATION large-eddy SIMULATION
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Relativistic description of second-order correction to nuclear magnetic moments with point-coupling residual interaction 被引量:7
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作者 LI Jian MENG Jie +2 位作者 RING Peter YAO JiangMing ARIMA Akito 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2011年第2期204-209,共6页
Using the single particle states and the residual interaction derived from the relativistic point-coupling model with the PC-F1 parameter set,the second-order core polarization corrections to nuclear magnetic moments ... Using the single particle states and the residual interaction derived from the relativistic point-coupling model with the PC-F1 parameter set,the second-order core polarization corrections to nuclear magnetic moments of LS closed shell nuclei ±1 nucleon with A = 15,17,39 and 41 are studied and compared with previous non-relativistic results.It is found that the second-order corrections are significant.With these corrections,the isovector magnetic moments of the concerned nuclei are well reproduced,especially those for A = 17 and A = 41. 展开更多
关键词 second-order core polarization magnetic moments relativistic point-coupling model residual interaction
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A Review on SOM-LES of Turbulent Two-Phase Combustion
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作者 ZHOU Lixing LIU Yang +3 位作者 WANG Fang HU Liyuan LI Ke LUO Kun 《Journal of Thermal Science》 SCIE EI CAS CSCD 2023年第6期2215-2221,共7页
Turbulent two-phase combustion is widely encountered in spray and pulverized-coal combustors,and large-eddy simulation(LES)becomes a powerful CFD method for its simulation,because LES can give unsteady flame structure... Turbulent two-phase combustion is widely encountered in spray and pulverized-coal combustors,and large-eddy simulation(LES)becomes a powerful CFD method for its simulation,because LES can give unsteady flame structures and more reasonable statistical results than Reynolds-averaged modeling.Present combustion models in LES either lack of generality or are computationally too expensive.A statistical moment model based on the idea of turbulence modeling called“second-order moment(SOM)combustion model”was developed by the present authors for LES of two-phase combustion.In this paper,a review is given on our published research results for SOM-LES of two-phase combustion,including the description of the SOM-LES model,its application,validation of statistical results by experiments,as well as the phenomena obtained by instantaneous results. 展开更多
关键词 two-phase combustion large-eddy simulation second-order moment model
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旋流数对湍流燃烧中NO生成影响的研究 被引量:18
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作者 周力行 陈兴隆 张健 《工程热物理学报》 EI CAS CSCD 北大核心 2002年第5期637-640,共4页
通过实验和用湍流燃烧二阶矩概率密度模型对不同旋流数下甲烷-空气湍流燃烧和NO生成进行了研究。在燃料中加入少量氨模拟燃料氮。研究结果表明,随旋流数的增大(由0到1),热NO排放先上升后下降,而总NO和燃料NO排放则先下降后上升。旋流... 通过实验和用湍流燃烧二阶矩概率密度模型对不同旋流数下甲烷-空气湍流燃烧和NO生成进行了研究。在燃料中加入少量氨模拟燃料氮。研究结果表明,随旋流数的增大(由0到1),热NO排放先上升后下降,而总NO和燃料NO排放则先下降后上升。旋流数增大使湍流强度先下降然后稍有上升,使进口附近温度先上升然后稍有下降。热NO的生成受温度的影响更大而燃料NO的生成受湍流的影响更大。 展开更多
关键词 旋流数 湍流燃烧 NO生成 二阶矩模型 一氧化氮
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预混燃烧大涡模拟和燃烧模型的检验 被引量:9
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作者 王方 周力行 +1 位作者 许春晓 黄勇 《推进技术》 EI CAS CSCD 北大核心 2008年第1期33-36,共4页
用代数二阶矩亚网格(ASOM-SGS)燃烧模型对文献中测量的钝体后方丙烷-空气预混燃烧进行了大涡模拟,模拟统计的时平均速度、速度脉动均方根值和温度分布与实验数据结果吻合很好,表明所采用的ASOM-SGS亚网格燃烧模型是合理的。模拟的瞬态... 用代数二阶矩亚网格(ASOM-SGS)燃烧模型对文献中测量的钝体后方丙烷-空气预混燃烧进行了大涡模拟,模拟统计的时平均速度、速度脉动均方根值和温度分布与实验数据结果吻合很好,表明所采用的ASOM-SGS亚网格燃烧模型是合理的。模拟的瞬态结果显现了钝体后方湍流流动和火焰结构。将大涡模拟数据统计得到的反应率系数-浓度关联量的分布规律,与代数二阶矩RANS(ASOM-RANS)燃烧模型的模拟值进行对比,结果发现,大涡模拟统计值和ASOM-RANS模型的模拟值很接近,从而证明了湍流燃烧代数二阶矩RANS模型的合理性。 展开更多
关键词 湍流燃烧 大涡模拟 二阶矩模型 火焰
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两种亚网格燃烧模型的旋流扩散燃烧大涡模拟 被引量:5
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作者 胡瓅元 周力行 张健 《推进技术》 EI CAS CSCD 北大核心 2006年第1期48-51,共4页
用二阶矩亚网格(SOM-SGS)燃烧模型和文献中的涡旋破碎亚网格(EBU-SGS)燃烧模型,对甲烷-空气旋流扩散燃烧进行了大涡模拟,将二者得到的LES统计平均温度分布和实验结果以及用二阶矩燃烧模型的统观模拟(RANS-SOM)结果比较,表明LES-SOM和RAN... 用二阶矩亚网格(SOM-SGS)燃烧模型和文献中的涡旋破碎亚网格(EBU-SGS)燃烧模型,对甲烷-空气旋流扩散燃烧进行了大涡模拟,将二者得到的LES统计平均温度分布和实验结果以及用二阶矩燃烧模型的统观模拟(RANS-SOM)结果比较,表明LES-SOM和RANS-SOM的模拟结果都和实验符合较好,而LES-EBU的模拟结果和实验不符合,在不同区域内高估或者低估了燃烧温度。其原因是由于EBU模型不能有效地考虑有限反应动力学的作用。LES-SOM模拟的瞬态结果显示了旋流扩散火焰的湍流大涡结构不同于射流火焰的特点。 展开更多
关键词 湍流燃烧 二阶矩燃烧模型 大涡模拟 旋流燃烧
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NO_x生成的有限反应速率二阶矩封闭模型 被引量:4
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作者 郭印诚 周力行 +1 位作者 王希麟 林文漪 《工程热物理学报》 EI CAS CSCD 北大核心 1998年第3期382-386,共5页
本文用有限反应速率二阶矩封闭模型对大速差射流燃烧室内煤粉燃烧过程中NO的生成进行了数值模拟,并将该模型的计算结果与Arrhenius模型的计算结果进行了比较,模拟结果表明,燃烧室中NO的生成是由燃料NO的生成机理来控制,Arrhenius模... 本文用有限反应速率二阶矩封闭模型对大速差射流燃烧室内煤粉燃烧过程中NO的生成进行了数值模拟,并将该模型的计算结果与Arrhenius模型的计算结果进行了比较,模拟结果表明,燃烧室中NO的生成是由燃料NO的生成机理来控制,Arrhenius模型计算得到的NO的浓度值高于有限反应速率二阶矩封闭模型的计算结果. 展开更多
关键词 二阶矩模型 煤粉 燃烧 数值模拟 氮氧化物
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