合成射流控制翼型分离的流动显示与PIV测量

合成射流是一种新型的流动控制技术,近年来引起广泛关注.本文首先利用热线风速仪测量了基于声激励的合成射流流动特性,确定了最佳输入信号频率;采用流动显示和PIV测试技术,研究了合成射流对二维翼型分离流动的控制效果.研究结果表明,合成射流可以有效地抑制二维翼型在大迎角下的分离流动;PIV测试结果进一步表明,合成射流开启后使翼型上表面分离区域减小,分离点后移.应用合成射流控制翼型流动分离,可以大大改善翼型在大迎角下的气动特性.

Flow visualization and PIV measurement of airfoil separated flow control based on synthetic jet

Synthetic jet is a new method of active flow control.Firstly,the flow characteristics of a synthetic jet equipment based on the acoustic actuator were measured by the hot-wire anemometry.Then the control effects of synthetic jet on airfoil were studied by using flow visualization and PIV technique.The results of flow visualization show that synthetic jet technology is a very effective method to control and alleviate the airfoil separated flow at the high angle of attack.The PIV measurement results further show that the synthetic jet flow make the separated area reduced,and the separated position is moved downstream.The airfoil performance will be improved greatly by the synthetic jet technology to control the airfoil separated flow.