基于多谱分析实验研究正交圆柱尾迹的全局空间动力学  

Experimental studies on the multi-spectrum based global spatial dynamics of wakes of two circular cylinders forming a cross

作　　者：马云驰[1] 余宇轩[2] 谢锡麟[2] 麻伟巍[1] 

机构地区：[1]东华大学理学院,上海200051 [2]复旦大学力学与工程科学系,上海200433

出　　处：《水动力学研究与进展（A辑）》2014年第6期649-655,共7页Chinese Journal of Hydrodynamics

基　　金：国家自然科学基金面上项目(10872051)~~

摘　　要：该文是对低雷诺数下的正交圆柱尾迹进行全局空间动力学实验研究。在不同的圆柱间距和圆柱直径比的工况下,基于功率谱筛选出谐波性质明显的工况,然后进行多谱分析。多谱分析基于一维全局能量关系式,研究发现线性-非线性机制和非线性机制在各个谐波分量上均有体现,而线性机制则出现在基频上,说明正交圆柱尾迹的流场以非线性机制为主导。This article is a experimental study on the global spatial dynamics of wakes of two circular cylinders arranged perpendicular under low Reynolds number. Comparisons of one dimensional global energy relations are made under the conditions of different cylinder spacing and diameter of cylinder ratio. In this research, the conditions with obvious harmonic properties are screened out, and then multi-spectrum analysis is carried out. The study shows that both linear-nonlinear mechanism and nonlinear mechanism display on every harmonic component, while linear mechanism displays on the dominant frequency component. That illustrates flow field of the wakes is dominated by nonlinear mechanism.

关 键 词：正交圆柱尾迹 全局空间动力学 多谱分析 一维全局能量关系式 

分 类 号：O357.5[理学—流体力学]