一种单出口流体振荡器件特性实验研究

为了控制机翼上的流动分离、翼尖涡以及抑制腔体共振，本文设计了一种单出口流体振荡器件。借助流动显示、声级计、热线风速仪及PIV等技术手段，对器件的频率 流量特性及出口流场特性进行了实验研究。结果表明:振荡器出口的空气射流能扫荡成扇形，扫荡角接近90°，射流振荡频率达103 Hz量级，振荡器能够将射流束较均匀地分散到整个出口区域，并且在较小的流量下平均流速可达约几米每秒至十米每秒，脉动速度与平均速度同量级，出口气流有较大的动能，能够控制较大的流场区域。

Experimental Investigation on Characteristics of Single-Outlet Fluidic Oscillators

A single-outlet fluidic oscillator is designed and used as actuators for controlling flow separation, wing tip vortex and cavity resonance suppression. Experiments on the oscillator characteristics are conducted to measure the frequency-flux relations and the flow field of the outlet of the oscillators by means of flow visualization, sound level meter, hot-wire anemometer and PIV.Experimental results demonstrate that the air jets can sweep and so fan out in an angle of nearly 90°, and the sweeping frequencies reach the order of magnitude of 103 Hz. The jets can be fan out on the whole plane of the outlet equally, and the velocity fluctuation gets the same order of magnitude as the mean velocity which is from a few meters per second to about ten on low flux conditions. The outlet jets have enough kinetic energy to influence a larger flow field.