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本文对激振与未激振锐缘分离流场细节进行了比较。结果表明 ,作用于分离点的适当频率的激振对分离流场产生了 6种互相耦合的作用效应 ,它们是 :( 1)从整体上减弱或抑制分离流动 ;( 2 )改变分离区湍流结构 ,加剧湍流运动 ,加快混合和剪切层增长 ;( 3)增强局部区域的回流流动现象 ;( 4 )使分离剪切层再附 ,改变分离流态和分离涡分布 ;( 5)减弱下游流场湍流脉动 ;( 6)增强尾流下弯程度。本文工作为激振控制分离流动技术的工程应用提供了物理基础与指导。
In this paper, the details of the flow field between sharp and unscented sharp edges are compared. The results show that the excitation of the appropriate frequency acting on the separation point produces six kinds of interaction effects on the separation flow field: (1) to weaken or inhibit the separation flow as a whole; (2) to change the turbulence structure in the separation zone , Exacerbate the turbulent flow and accelerate the growth of the mixing and shear layer; (3) enhance the reflow flow in the local area; (4) re-attach the separated shear layer to change the separation flow regime and the separation vortex distribution; (5) Field turbulent pulsation; (6) to enhance the degree of wake wake. The work in this paper provides the physical basis and guidance for engineering application of vibration control and separation flow technology.