压电驱动自耦合射流速度分布的实验研究

Experimental Study of Velocity Distribution for Synthetic Jet Driven by Piezoelectric Actuator

利用热线风速仪对压电驱动自耦合射流激发器在不同的电压和激励频率下所形成的射流速度分布进行了测试。研究发现,自耦合射流存在着340和1 000 H z两个最佳激励频率;自耦合射流在喷口长轴方向临近喷口的位置呈马鞍状分布,随距离增加而接近于稳态射流;在喷口短轴方向速度呈对称的单峰形状,和常规射流一样具有自相似性;在喷口法线方向速度呈先上升后下降的趋势,最大值出现在距离喷口约10倍狭缝宽度的位置上。

To investigate the characteristics of the velocity of a synthetic jet driven by the piezoelectric actuator at different voltages and frequencies, an experiment by using a hot-wire anemometer is carried out. Experimental results show that there are two resonance frequencies for the actuator of the synthetic jet, 340 Hz and 1 000 Hz. Near the nozzle, the velocity distribution along the slot length direction appears a saddle shape, and the saddle shape disappears with the distance far away from the nozzle. The velocity profiles of the synthetic jet along slot-width appear self-similarity same to the continuous jet; and the normal velocity of the synthetic jet increases and then decreases. The greatest value appears in the position of 10 times of the slot width at a distance from the nozzle.