| 雷诺数对后向台阶剪切层转捩特性的影响 |
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| 引用本文： | 周宁,迮程,潘翀.雷诺数对后向台阶剪切层转捩特性的影响[J].北京航空航天大学学报,2014,40(7):978-983. |
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| 作者姓名： | 周宁 迮程 潘翀 |
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| 作者单位： | 北京航空航天大学教育部流体力学重点实验室,北京,100091;中国空间技术研究院,北京,100081 |
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| 基金项目： | 国家自然科学青年基金资助项目（11372001，11002015） |
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| 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.
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| 关 键 词： | 后向台阶 分离再附 转捩 扰动增长 |
| 收稿时间： | 2013-09-16 |
Effect of Reynolds number on characteristics of separated shear layer transition of backward facing step |
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| Zhou Ning,Ze Cheng,Pan Chong.Effect of Reynolds number on characteristics of separated shear layer transition of backward facing step[J].Journal of Beijing University of Aeronautics and Astronautics,2014,40(7):978-983. |
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| Authors: | Zhou Ning Ze Cheng Pan Chong |
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| 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. |
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