稀疏气固两相湍流边界层拟序结构变动特性

doi:10.3969/j.issn.0438-1157.2012.11.005

化工学报 ›› 2012, Vol. 63 ›› Issue (11): 3407-3417.DOI: 10.3969/j.issn.0438-1157.2012.11.005

稀疏气固两相湍流边界层拟序结构变动特性

栗晶¹, 蒋贵丰¹, 王汉封², 易超¹, 柳朝晖¹, 郑楚光¹

1. 华中科技大学煤燃烧国家重点实验室, 湖北武汉 430074;
2. 中南大学土木工程学院, 湖南长沙 410075

收稿日期:2012-04-10 修回日期:2012-08-10 出版日期:2012-11-05 发布日期:2012-11-05
通讯作者: 柳朝晖
作者简介:栗晶(1982-),男,博士,讲师。
基金资助:
国家自然科学基金项目(50936001,50976042)。

Modifications of coherent structures in turbulent boundary layer of dilute gas-particle horizontal channel flow

LI Jing¹, JIANG Guifeng¹, WANG Hanfeng², YI Chao¹, LIU Zhaohui¹, ZHENG Chuguang¹

1. State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, Hubei, China;
2. School of Civil Engineering, Central South University, Changsha 410075, Hunan, China

Received:2012-04-10 Revised:2012-08-10 Online:2012-11-05 Published:2012-11-05
Supported by:
supported by the National Natural Science Foundation of China(50936001,50976042).

摘要/Abstract

摘要： 应用PIV两相同时测量方法,对壁面Reynolds数为430的水平槽道稀疏气固两相湍流边界层拟序结构变动特性进行了研究。选取质量载荷为10^-4~10^-3的110 μm聚乙烯颗粒作为离散相。结果表明,低载荷颗粒仍能显著改变湍流拟序结构,进而影响宏观湍流属性。颗粒重力沉降形成的粗糙壁面增强了壁面附近湍流猝发行为,导致黏性底层中的气相法向脉动速度和雷诺剪切应力显著增大。颗粒与壁面的碰撞加强了低速流体上抛、削弱了高速流体下扫,同时增强了轨道交叉效应,从而抑制了湍流拟序结构发展,显著减小了黏性底层以上区域的法向脉动速度和雷诺剪切应力。此外,颗粒惯性还减小了黏性底层厚度、增大了流向速度梯度,导致气相流向脉动速度峰值增大,且其对应位置也更加靠近壁面。

关键词: 湍流变动, 湍流拟序结构, 湍流边界层, 稀疏气固两相流, 水平槽道

Abstract: Modifications of coherent structures in a turbulent boundary layer of dilute gas-particle horizontal channel flow were experimentally investigated by means of simultaneous two-phase PIV(particle image velocimetry)measurement.The measurements were conducted in the near-wall region at Reynolds number of 430 based on the wall friction velocity and half channel height.Polyethylene beads with the diameter of 110 μm were used as the dispersed phase,and three low mass loading ratios ranging from 10^-4 to 10^-3 were tested.Spatial two-point correlations of fluctuation velocities and quadrant analysis were adopted to examine the change of characteristics of turbulent coherent structures in the lower boundary layer.It was found that the addition of particles noticeably modified the turbulence structures in meso-scale near the wall event at mass loading ratio 0.025%,thereby affected the gas-phase turbulence characteristics in macro-scale,e.g.fluctuation velocities and Reynolds shear stress etc.Particle sedimentation increased the roughness of the bottom wall,which significantly enhanced turbulent bursting in the inner region of the boundary layer.And then the wall-normal fluctuation velocity and Reynolds shear stress were both increased in the viscous sublayer.Under the effect of particle-wall collision,the Q2 events(ejections)of gas-phase were slightly increased by particles,while the Q4 events(sweeps)were obviously decreased.In addition,the spatial scale of the wall structures also remarkably shrink under the intensified crossing-trajectory effects due to particle saltation near the bottom wall.Consequently,the presence of the particles suppressed the turbulent coherent structures in the outer region of the boundary layer,which resulted in significantly decreasing wall-normal fluctuation velocity and Reynolds shear stress of the gas-phase above the viscous sublayer.Particle inertia changed the viscous sublayer of gas turbulence with a smaller thickness and a larger streamwise velocity gradient,which increased the peak value of streamwise fluctuation velocity of the gas-phase with its location shifting to the wall.

Key words: turbulence modification, turbulent coherent structures, turbulent boundary layer, dilute gas-particle flow, horizontal channel

中图分类号:

O357.5
O359

栗晶, 蒋贵丰, 王汉封, 易超, 柳朝晖, 郑楚光. 稀疏气固两相湍流边界层拟序结构变动特性[J]. 化工学报, 2012, 63(11): 3407-3417.

LI Jing, JIANG Guifeng, WANG Hanfeng, YI Chao, LIU Zhaohui, ZHENG Chuguang. Modifications of coherent structures in turbulent boundary layer of dilute gas-particle horizontal channel flow[J]. CIESC Journal, 2012, 63(11): 3407-3417.

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稀疏气固两相湍流边界层拟序结构变动特性

Modifications of coherent structures in turbulent boundary layer of dilute gas-particle horizontal channel flow

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