双圆形出口零质量射流组的流场结构PIV实验研究

对不同出口间距零质量射流组的流场结构进行了PIV实验.采用相位锁定技术测量了周期内不同相位的瞬时流场速度矢量, 显示了两股射流涡对之间相互作用、融合成为一股射流的全过程.发现射流出口间距越大, 射流组融合完成所需的时间、空间历程越长.在射流组融合完成后的下游截面上, 速度分布和单射流相似, 具有自模性.虽然融合未完成前各截面不存在整体自模性, 但两股射流外侧仍满足自模性. 

Experimental study of flow field in twin circular synthetic jet arrays using PIV

A PIV experimental study of flow structures of synthetic jet arrays which had different orifice spacing was carried out. To capture the instantaneous flow velocity vectors, the phase-locked technique was designed for the experimental system. The experiment images show the complete forming process of single jet synthesized by the interaction of vortex rings produced by twin synthetic jet respectively. It is found that the spatial distance needed for synthesizing is varied with the spacing of the jet arrays. It is similar to the conventional 2-D jet that the cross-velocity profiles at different stations after the synthesizing position are self-simulation. The property is also suitable for the lateral sides of jet arrays in the synthesizing distance.