斜出口合成射流激励器非定常流场特性实验研究

Experimental investigation on unsteady flow fields of synthetic jet actuator with beveled orifice

设计了平直和倾斜单出口合成射流激励器,应用非接触粒子图像激光测速技术(PIV)对出口附近的非定常流场特性进行了研究,得到了两种激励器产生的合成射流的瞬态和时均流动结构。研究结果表明:斜出口和常规平直出口激励器流场结构存在明显差异,右斜出口激励器仅在出口左侧边缘形成集中旋涡,在右侧形成附壁射流,补充激励器内部质量的空气来自于尖锐出口左侧,时均流场呈现沿壁面的横向输运特性,其流动特性十分有利于进行边界层分离流动控制。

Designed the straight and beveled orifice of synthetic jet actuator, with Particle Image Velocimetry （PIV）, measurements of unsteady flow field near the orifice of synthetic jet actuator are performed. The phase-locked instantaneous flow maps are given, and ensemble-averaging flow field as well. The investigation results show that there is an obvious difference on flow structure between beveled and conventional straight orifice of synthetic jet actuator, to the right beveled orifice, a vortex is formed at the left sharp edge of orifice and wall-attachment effect is fornaed at the right edge of orifice. During the sucking period, the fluid is sucked into the actuator along the left edge of orifice. The energy and mass flux are transmitted horizontally. These characteristics show the great potential to be applied for boundary flow separation control.