二维射流的稳定性分析与流动控制  

Stability Analysis and Flow Control of 2-D Jet

作　　者：李勇[1] 明晓[1] 

机构地区：[1]南京航空航天大学空气动力学系,南京210016

出　　处：《空气动力学学报》2000年第3期375-380,共6页Acta Aerodynamica Sinica

基　　金：国家自然科学基金资助项目! (1 9472 0 34)

摘　　要：本文在绝对 /对流不稳定性的理论框架下 ,对二维射流的稳定性进行了数值分析。研究表明射流流场各局部剖面是对流不稳定的 ,不会产生整体失稳 ,射流频率由流场中最大增长的不稳定频率确定。将一NACA0 0 1 2翼型放置于射流势流核心区中 ,改变翼型的偏转角度θ ,可使射流剪切层频率与翼型尾流频率发生共振 ,整个流场产生自激振荡 ,加强了射流与外界流场的混合 ,并使射流发生矢量偏转。Instability of 2 D jets has been studied by numerical analysis and experiments. The numerical analysis is based on the theoretical framework of absolute and convective instability. For 2 D jets, numerical analysis has shown that there exist convective instability, instead of absolute instability, which means no self sustained oscillation in 2 D jets. This thesis also experimentally studies a two dimensional planar jet impinging upon a NACA0012 air fold located at the jet center of the potential core region, and the change of instability of planar jet is studied.

关 键 词：二维射流 稳定性 射流频率 流动控制 自激振荡 

分 类 号：V211.19[航空宇航科学与技术—航空宇航推进理论与工程] V211.13