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本文通过自主研发的层析PIV技术实现了Re=315的合成射流三维测量.针对层析PIV技术在测量强剪切速度场中存在的问题,在成像景深方向采用较小尺寸的判读体较好地获得了射流涡环的流场信息.同时对实验数据满足连续性方程的特性进行了研究,发现相位平均对周期性流动有很好的平滑作用,能有效减弱测量流场的散度偏差,更好地满足连续性方程.由于合成射流的无量纲冲程长度L=6.3大于临界值4,因此在实验测量流场中观测到双涡环流动结构追逐并融合的现象,利用旋涡诱导理论能很好的解释主涡和次涡在融合前后速度和旋涡强度的变化规律.
In this paper, a three-dimensional (3D) synthetic jet with Re = 315 is realized by a self-developed tomographic PIV technique.Aiming at the problems of tomographic PIV in measuring the strong shear velocity field, it is better to use smaller size interpretation in the depth of field The information of the flow field of the jet vortex ring was obtained.At the same time, the experimental data satisfying the continuity equation was studied and found that the phase averaging has a good smoothing effect on the periodic flow, which can effectively reduce the divergence deviation of the measurement flow field, The continuity equation can be satisfied better.Due to the non-dimensional stroke length L = 6.3 of the synthetic jet is greater than the critical value 4, the phenomena of chasing and merging of the double-vortex ring flow structure are observed in the experimental measurement flow field. Good explanation of the main vortex and the second vortex in the merger before and after the vortex velocity and vorticity changes.