应用PIV技术研究"零质量"射流的非定常流场特性

首次采用PIV瞬态流场测试技术对“零质量”射流激振器近出口处附近的非定常流场进行了定量测量，应用相位锁定采样技术，测到了激励周期内不同相位时射流出口的瞬态流场，由200幅瞬态流场图像的平均得到了射流流场的平均流动特性。通过对射流出口涡环的产生、发展及运动特性的分析，认识到涡环之间相互作用是形成“零质量”射流的流动机理。

Investigation on the characteristics and structures of unsteady flow field near the Zero-mass flux jet with PIV

Experimental investigation on unsteady flow field near the orifice of Zero-mass flux jet actuator is held with PIV measurement technique. The phase-locked sampled instantaneous images and quantitative measurement results during the actuating cycle are given, and ensemble-averaging of 200 image pairs as well. The PIV measurement results show the properties and structures of the unsteady flow field in which a train of vortex rings are formed at the sharp edge of the orifice, thus the energy and mass flux are transmitted downstream-wise by the interactions of themselves.