湍流分离流中颗粒的扩散机制

doi:10.3969/j.issn.1007-2861.2015.03.002

上海大学学报(自然科学版) ›› 2016, Vol. 22 ›› Issue (5): 586-596.doi: 10.3969/j.issn.1007-2861.2015.03.002

湍流分离流中颗粒的扩散机制

邱骁, 丁珏, 王忠杰, 翁培奋

上海大学上海市应用数学和力学研究所, 上海 200072

收稿日期:2015-06-12 出版日期:2016-10-31 发布日期:2016-10-31
通讯作者: 丁珏(1973—), 女, 副研究员, 博士, 研究方向为多相流体力学等. E-mail: dingjue lu@shu.edu.cn
作者简介:丁珏(1973—), 女, 副研究员, 博士, 研究方向为多相流体力学等. E-mail: dingjue lu@shu.edu.cn
基金资助:
国家自然科学基金资助项目(11472167)

Particles diffusion mechanism in turbulent separation flow

QIU Xiao, DING Jue, WANG Zhongjie, WENG Peifen

Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University, Shanghai 200072, China

Received:2015-06-12 Online:2016-10-31 Published:2016-10-31

摘要/Abstract

摘要：

后台阶流动包含分离流重要的流动特性, 采取欧拉-拉格朗日耦合算法对后台阶分离流动中颗粒扩散运动进行数值研究. 气相场采取大涡模拟方法, 亚格子模式基于标准的Smagorinsky 模式, 颗粒相运动采取轨道法模拟. 计算所得气相的流向平均速度和平均脉动速度与实验结果吻合较好, 验证了模型和方法的正确性. 基于此, 数值分析后台阶两相流动的特性以及流场涡结构的发展和演化过程. 结果表明: 两相流中颗粒的扩散特性既受到颗粒粒径的影响, 又与颗粒和涡结构的相互作用时间有关. 后台阶流场中增加结构物时, 流场涡结构发生变化, 即与扰动源保持一定距离后, 涡数量增多, 流场中颗粒分布不均匀, 较多颗粒聚集在涡的外缘.

关键词: 大涡模拟, 分离流 , 后台阶流动 , 欧拉-拉格朗日方法 , 气粒两相流动

Abstract:

Back-facing step flow contains important characteristics of a separation flow. Based on this, a numerical simulation on particles diffusion mechanism in turbulent separation flow was conducted by Euler-Lagrangian coupled method. The gas phase governing equations were solved by large eddy simulation method and the subscale grid model was solved by Smagorinsky model. The particle phase was tracked with Lagrangian method. The accuracy of the solver was tested by comparing the simulation results with the experiment data. Based on this solver, the characteristics of the two phase flow, and the developing and evolutional process of vortex were numerically analyzed. The results showed that the diffusion of particles was related to particle’s diameter, the interaction time between particles and vortex structures. The structure of vortex changed when an obstacle was added to the flow field. The number of vortex increased at a certain distance away from the obstacle. The particles concentrate at the edge of the vortex and the distribution of particles were nonuniform in the flow field.

Key words: Euler-Lagrangian method , gasparticle flow , large-eddy simulation, separation flow , backward-facing step flow

邱骁, 丁珏, 王忠杰, 翁培奋. 湍流分离流中颗粒的扩散机制[J]. 上海大学学报(自然科学版), 2016, 22(5): 586-596.

QIU Xiao, DING Jue, WANG Zhongjie, WENG Peifen. Particles diffusion mechanism in turbulent separation flow[J]. Journal of Shanghai University（Natural Science Edition）, 2016, 22(5): 586-596.

参考文献

[1] Eaton J K. Two-way coupled turbulence simulations of gas-particle flows using point-particle tracking [J]. International Journal of Multiphase Flow, 2009, 35(9): 792-800.
[2] Hadinoto K, Jones E N, Yurteri C, et al. Reynolds number dependence of gas-phase turbulence in gas-particle flows [J]. International Journal of Multiphase Flow, 2005, 31(4): 416-434.
[3] Yan F, Lightstone M F,Wood P E. Numerical study on turbulence modulation in gas-particle flows [J]. Heat & Mass Transfer, 2007, 43(3): 243-253.
[4] Laitone J A. A numerical solution for gas-particle flows at high Reynolds numbers [J]. Journal of Applied Mechanics, 1981, 48(3): 465-471.
[5] Yu K F, Lau K S, Chan C K. Large eddy simulation of particle-laden turbulent flow over a backward-facing step [J]. Communications in Nonlinear Science and Numerical Simulation, 2004, 9(2): 251-262.
[6] Mohammed H A, Alawi O A, Wahid M A. Mixed convective nano-fluid flow in a channel having backward-facing step with a baffle [J]. Powder Technology, 2015, 275: 329-343.
[7] Chen Y T, Nie J H, Armaly B F, et al. Turbulent separated convection flow adjacent to backward-facing step-effects of step height [J]. International Journal of Heat and Mass Transfer, 2006, 49(19): 3670-3680.
[8] 王兵, 张会强, 王希麟. 颗粒在大涡结构中的弥散[J]. 力学学报, 2005, 37(1): 105-109.

[9] Kulick J D, Fessler J R, Eaton J K. Particle response and turbulence modification in fully developed channel flow [J]. Journal of Fluid Mechanics, 1994, 277(1): 109-134.
[10] Fessler J R, Eaton J K. Turbulence modification by particles in a backward-facing step flow [J]. Journal of Fluid Mechanics, 1999, 394: 97-117.
[11] Sagaut P. Large eddy simulation for incompressible flows: an introduction [M]. 3rd ed. Berlin: Springer-Verlag, 2006.
[12] 张兆顺, 崔桂香, 许春晓. 湍流理论与模拟[M]. 北京: 清华大学出版社, 2005: 54-129.

湍流分离流中颗粒的扩散机制

Particles diffusion mechanism in turbulent separation flow

PDF

可视化

被引次数

摘要/Abstract

引用本文

使用本文

参考文献

相关文章 1

编辑推荐

Metrics

本文评价