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选取了跟随性能以及散射性能都上佳的二氧化钛粒子,利用了粒子图像测速仪(particle imagevelocimetry,PIV)对不同落压比下的非对称喷管(single expansion ramp nozzle,SERN)流场进行了测量,成功获取了相应流动结构,以及沿程上壁面压力分布和速度场等.在测得的图像中,可以清晰地观察到由于过膨胀产生的激波与膨胀波系,并进一步获得出口速度分布.运用计算流体动力学数值模拟方法,对实验状态下的非对称喷管进行了模拟.对比结果发现:PIV实验测得流场结构能很好地与其吻合,这互相验证了CFD计算和PIV实验的正确性及可靠性.
Titanium dioxide particles with good follow-up performance and scattering performance were selected. The flow field of a single expansion ramp nozzle (SERN) at different pressure ratios was measured by using Particle Image Velocimetry (PIV) , Successfully obtained the corresponding flow structure, along the wall along the pressure distribution and velocity field, etc. In the measured images, you can clearly observed due to over-expansion of the shock wave and the expansion of the wave system and further to obtain the exit velocity distribution The numerical simulation of computational fluid dynamics was used to simulate the asymmetric nozzle under experimental conditions, and the results showed that the flow field structure was well fitted by PIV experiment, which validated the CFD calculation and PIV experiment The correctness and reliability.