Characteristics of Cavity Flow at Different Reynolds Numbers

Chen Huai

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Characteristics of Cavity Flow at Different Reynolds Numbers

更新时间：2023-11-14

- Characteristics of Cavity Flow at Different Reynolds Numbers
- Advanced Engineering Sciences Vol. 45, Issue Z2, Pages: 14-19(2013)
- 作者机构：
  
  清华大学水沙科学与水利水电工程国家重点实验室
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2013，
  
  Published Online：9 February 2013，
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陈槐.不同雷诺数下空腔流的流动特性（研究生论坛）[J].工程科学与技术,2013,45(Z2):14-19.

Chen Huai. Characteristics of Cavity Flow at Different Reynolds Numbers. [J]. Advanced Engineering Sciences 45(Z2):14-19(2013)
陈槐.不同雷诺数下空腔流的流动特性（研究生论坛）[J].工程科学与技术,2013,45(Z2):14-19. DOI：

Chen Huai. Characteristics of Cavity Flow at Different Reynolds Numbers. [J]. Advanced Engineering Sciences 45(Z2):14-19(2013) DOI：

摘要

中文摘要: 利用PIV测量空腔中垂面流场，研究雷诺数对空腔流流动特性的影响。时均结构在不同雷诺数下都具有相似的主流区及回流旋涡区。涡量的最大值位于进口角点处，高值区集中在边界层分离区。紊动强度及雷诺应力的高值区位于主流与出口角点的冲撞处，随着雷诺数的增大，参数高值区沿流向的长度不断变大，而进口角区低值区的范围不断缩小。纵、垂向能谱特征参数在相同雷诺数下的空间分布规律基本一致；调整雷诺数将导致回流区的掺混范围及来流自身的紊动特性发生改变，从而影响空腔流能谱的空间分布规律。

Abstract

Abstract:This study focuses on influence of Reynolds number on characteristics of cavity flow using Particle Image Velocimetry (PIV). Results show that time-mean velocity fields display same structures at different Reynolds numbers

namely

main flow and backflow vortex structures. The maximum vorticity locates at the entrance corner

and high value vorticity gathers in the boundary separation zone. At the impinging corner

values of turbulent intensities and Reynolds stress reach maximum. The stream-wise lengths of high value zone of turbulent intensities and Reynolds stress increase with the increase of Reynolds number

but it is opposite to low value zone in the entrance corner. Distribution forms of characteristic parameter of longitudinal and vertical spectrum resemble each other at different Reynolds numbers. Variation of Reynolds number results into mixing range changes of backflow and characteristic changes of the incoming flow

which will influence the distribution of spectrum in the cavity.

关键词

PIV雷诺数空腔流流动特性

Keywords

PIVReynolds numbercavity flowflow characteristic

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