大功率狭缝式活塞激励器流场测量与分析

研制了一种大功率活塞射流激励器,出口瞬时速度峰值可达0.3Hz,通过对活塞激励器射流流场测量,得到激励器出口流场速度、涡量分布,分析得到激励器合成射流流动结构与特征,通过采用活塞激励器控制同轴射流掺混,实验结果证明此种活塞激励器可以用于相对较高的速度流场的主动流动控制.利用提出的设计方法设计合成射流激励器可以在激励器出口形成稳定的对涡结构,采用一定的激励频率即可对喷管气流掺混进行有效控制.研究表明,合成射流激励器作为主动流动的执行机构,在航空动力排气系统具有潜在的重要价值.

Measurements and analysis of high-power slot-type piston actuator flow-field

A high-power piston actuator was investigated and peak instantaneous velocity could be up to 0.3 Mach number. Exit velocity and vorticity distribution were obtained through experimental measurements. Synthetic jet flow structure and characters were investigated. Coaxial jet mixing was controlled by piston actuator, indicating which can be used in relative high velocity field to realize active flow control. The results show that the steady vortex pair at export can be formed by using the design methods of synthetic jet actuator presented. The mixing for nozzle flow can be effectively controlled with a certain excitation frequency. It presents that synthetic jet actuator can be used as the implementation of active flow control and has potentially important value to air power exhaust system.