来流速度型对立方体顶部湍流回流区影响的数值分析

来流速度型对立方体顶部湍流回流区影响的数值分析

米海蓉，郜冶

哈尔滨工程大学建筑工程学院，哈尔滨 150001

收稿日期:2007-03-01 修回日期:1900-01-01 出版日期:2007-07-26 发布日期:2007-07-26
通讯作者: 米海蓉

Numerical Analyzing for Influence of Different Cases of Upstream Flow Velocity on Turbulent Backflow Above the Top of the Cube

MI Hai-rong, GAO Ye

College of Civil Engineering, Harbin Engineering University, Harbin 150001,China

Received:2007-03-01 Revised:1900-01-01 Online:2007-07-26 Published:2007-07-26
Contact: MI Hai-rong

摘要/Abstract

摘要： 为了研究不同上游来流速度型变化对立方体顶部表面是否会在前角附近产生分离、分离程度和附着情况,在对有关的实验数据进行分析比较的基础上，使用标准k-ε模型，说明立方体顶部在什么情况下会出现回流和附着，并提出附着长度Z_R和上游来流速度型u=y^1/m直接相关。同时计算结果表明：Z_R随着m的减小而增大；当m大于7时，在立方体块上部产生较严重的分离而不会有附着，这时出现Z_R>1.0。

关键词: 湍流, 上游来流速度, 分离, 附着

Abstract: Different cases of upstream flow were investigated and the occurring conditions of separation, separation degree, and attachment in the frontal face of the cube were analyzed. Based on the comparison of the experimental data, occurring conditions of backflow and attachment, which were analyzed using standard k-ε model, the attachment length Z_R are directly related with the upstream flow velocity u, the equation is u= y^1/m.When m is decreases, the Z_R increases. When m is larger than 7, there is a strong separation above the top of the cube, but no attachment, Z_R is over 1.0.

Key words: turbulent, upstream flow velocity, separation, attachment

中图分类号:

TV131.2

米海蓉，郜冶. 来流速度型对立方体顶部湍流回流区影响的数值分析[J]. J4, 2007, 37(4): 773-0777.

MI Hai-rong, GAO Ye. Numerical Analyzing for Influence of Different Cases of Upstream Flow Velocity on Turbulent Backflow Above the Top of the Cube[J]. J4, 2007, 37(4): 773-0777.

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