雷诺数对后向台阶剪切层转捩特性的影响

周宁; 迮程; 潘翀

doi:10.13700/j.bh.1001-5965.2013.0481

雷诺数对后向台阶剪切层转捩特性的影响

doi: 10.13700/j.bh.1001-5965.2013.0481

周宁¹,
迮程²,
潘翀^3, ,

1. 北京航空航天大学教育部流体力学重点实验室, 北京 100091;
2. 中国空间技术研究院, 北京 100081;
3. 北京航空航天大学教育部流体力学重点实验室, 北京 100091

基金项目:

国家自然科学青年基金资助项目（11372001，11002015）

详细信息

作者简介:
周宁（1989-），女，河北秦皇岛人，硕士生，zhouning00168@126.com.

通讯作者:
潘翀，panchong@buaa.edu.cn.

中图分类号: O357.5
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- 文章访问数: 1442
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- 被引次数: 0
出版历程
- 收稿日期: 2013-09-16
- 网络出版日期: 2014-07-20

Effect of Reynolds number on characteristics of separated shear layer transition of backward facing step

Zhou Ning¹,
Ze Cheng²,
Pan Chong^{3
, ,}

1. Key Laboratory of Fluid Mechanics of Education Department, Beijing University of Aeronautics and Astronautics, Beijing 100191, China;
2. China Academy of Space Technology, Beijing 100081, China;
3. Key Laboratory of Fluid Mechanics of Education Department, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

摘要

摘要: 二维后向台阶分离流动是研究流动分离再附特性及机理的经典物理模型.运用二维时间解析粒子图像测速（PIV，Particle Image Velocimetry）技术，对雷诺数在300~3 000 之间后向台阶分离再附流动进行了二维速度场测量，研究后向台阶层流剪切层转捩位置随雷诺数的变化.研究发现，随雷诺数的增大，再附点的位置不断前移，转捩点的位置随之前移.转捩点在剪切层中的相对位置与雷诺数成反比函数关系.另外，在转捩发生之前，扰动会经历一段线性增长阶段，其空间增长率与雷诺数正相关.
- 后向台阶 /
- 分离再附 /
- 转捩 /
- 扰动增长
Abstract: The backward-facing step flow is a classical model for the investigation of shear layer separation and reattachment characteristics. The transitional shear layer and its Re dependence was discussed by using two-dimensional time-resolved particle image velocimetry (PIV) measurement. It was observed that the location of reattachment point moves upstream if Re increases, while the transition point of the shear layer moves forward at the same time, leading to the dimensionless reattachment length inversely proportional to Re. In addition, before the transition occurs, the perturbation contained within the shear layer presents initial exponential growth, whose spatial growth rate is positively correlated with Re.
- backward-facing step flow /
- separation and reattachment /
- transition /
- disturbance growth

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参考文献(21)

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