剪切流动中声、涡弱非线性作用与声控流动机理  

WEAKN ON-LINEAR INTERACTION BETWEEN SOUND&VORIEX IN SHEAR FLOW AND MECHANISM OF FLOW CONTROL BY SOUND

作　　者：居鸿宾[1] 钟芳源[1] 

机构地区：[1]清华大学工程力学系,上海交通大学动力机械工程系

出　　处：《力学学报》1995年第S1期1-7,共7页Chinese Journal of Theoretical and Applied Mechanics

基　　金：国家教委博士点基金

摘　　要：对非均匀流（特别是平行剪切流）中声、涡运动模式的划分及其相互作用进行了弱非线性分析，着重研究了一阶声、涡作用产生二阶涡的情况，计算了二阶生成涡相对于一阶涡的时均放大倍数。从这一角度分析了声学控制流动问题，指出与声波发生作用的涡的性质以及涡频率与声频率之间的关系，并定性地讨论了声压阈值问题。The identification of sound and vortex and their interaction in nonuniform flow are discussed using split technique of velocity vector and asymptotic expansions.In particular,second order interaction in shear flow is considered.The result is used to explain the phenomena in airfoil flow controled by sound.After calculating the amplification of second order vortex,the effective vortex patterns and the relation between vortex frequency and sound frequency are obtained.In addition,the threshold value of sound pressure is discussed qualitatively.

关 键 词：声学 涡运动 剪切流动 非定常流 非线性作用 声控流动 声涡相互作用 

分 类 号：O355[理学—流体力学]