液固两相圆柱绕流尾迹内颗粒扩散分布的离散涡数值研究

黄远东; 吴文权

液固两相圆柱绕流尾迹内颗粒扩散分布的离散涡数值研究

上海理工大学环境工程系,上海 200093

基金项目: 国家自然科学基金资助项目(70371011);上海市教委发展基金(03GK04)

详细信息

作者简介:
黄远东(1965- ),男,湖南邵阳人,副教授,博士(联系人.Tel:+86-21-55222716;E-mail:huangyuandong@tsinghua.org.cn)

中图分类号: O352
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出版历程
- 收稿日期: 2004-06-18
- 修回日期: 2005-12-15
- 刊出日期: 2006-04-15

Numerical Study of Particle Distribution in the Wake of Liquid-Particle Flows Past a Circular Cylinder Using Discrete Vortex Method

Department of Environmental Engineering, University of Shanghai for Science and Technology, Shanghai 200093, P. R. China

摘要

摘要: 基于离散涡方法求得的非定常水流场和颗粒的Lagrange运动方程，数值模拟了稀疏液固两相圆柱绕流尾迹内颗粒的扩散分布．获得了流动的涡谱与3种不同St数颗粒（St=0.25，1.0，40）在流场中的分布．通过引入扩散函数来定量表示颗粒在流场中的纵向扩散强度，并计算得到了不同St数颗粒的扩散函数随时间的变化．数值结果揭示出了液固两相圆柱绕流尾迹中的颗粒扩散分布与颗粒的St数和尾涡结构密切相关：1) 中小St数(St=0.25～4.0)颗粒在运动过程中不能进入涡核区，而在旋涡结构的外沿聚集，且颗粒的St数愈大，其越远离涡核区域；2）在圆柱绕流尾迹区域内，中小St数(St=0.25～4.0)颗粒的纵向扩散强度随其St数的增大而减小．
- 液固两相 /
- 高Reynolds数 /
- 离散涡方法 /
- 尾涡 /
- 颗粒扩散
Abstract: Particle-laden water flows past a circular cylinder are numerically investigated.The Dis crete vortex method was employed to evaluate the unsteady water flow fields and a Lagrangian ap proach was applied for tracking individual solid particles.A dispersion function was defined to repre sent the dispersion scale of the particle.The wake vortex patterns,the distributions and the time se ries of dispersion functions of particles with different Stokes numbers were obtained.Numerical re sults show that the particle distribution in the wake of the circular cylinder is closely related to the particles Stokes number and the structure of wake vortices:1) the intermediate sized particles with Stokes numbers,St,of 0.25,1.0 and 4.0 can not enter the vortex cores and concentrate near the pe ripheries of the vortex structures;2) in the circular cylinder wake,the dispersion intensity of particles decreases as St is increased from 0.25 to 4.0.
- liquid-particle /
- high Reynolds number /
- discrete vortex method(DVM) /
- wake vortex /
- particle dispersion

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参考文献(10)

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[3]	Narayanan Chidambaram,Lakahel Djamel,Yadigaroglu George.Linear stability analysis of particle-laden mixing layers using Lagrangian particle tracking[J].Powder Technology,2002,125(2):122—130. doi: 10.1016/S0032-5910(01)00498-3
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[5]	黄远东,吴文权,张红武,等.非定常不稳定液固两相流动中旋涡对颗粒运动影响的数值研究[J].水科学进展,2002,13(1):1—8.
[6]	WU Wen-quan,Sisto F.Vortex simulation of unsteady stall in a Cascade with piecewise linearization and recorrection technique[A].In:Taylor C，Habashi W G,Hafez M M,Eds.Proceedings of the 5th International Conference on Numerical Methods in Laminar and Turbulent Flow[C].Swansea,UK: Pineridge Press,1987,1686—1697.
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液固两相圆柱绕流尾迹内颗粒扩散分布的离散涡数值研究

作者简介:
黄远东(1965- ),男,湖南邵阳人,副教授,博士(联系人.Tel:+86-21-55222716;E-mail:huangyuandong@tsinghua.org.cn)

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Numerical Study of Particle Distribution in the Wake of Liquid-Particle Flows Past a Circular Cylinder Using Discrete Vortex Method

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液固两相圆柱绕流尾迹内颗粒扩散分布的离散涡数值研究

作者简介: 黄远东(1965- ),男,湖南邵阳人,副教授,博士(联系人.Tel:+86-21-55222716;E-mail:huangyuandong@tsinghua.org.cn)

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出版历程

Numerical Study of Particle Distribution in the Wake of Liquid-Particle Flows Past a Circular Cylinder Using Discrete Vortex Method

计量

出版历程

目录

作者简介:
黄远东(1965- ),男,湖南邵阳人,副教授,博士(联系人.Tel:+86-21-55222716;E-mail:huangyuandong@tsinghua.org.cn)