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针对PIV技术在暂冲式风洞高亚音速平面叶栅流场测量中遇到的示踪粒子投放问题,本研究通过采用高压雾化式粒子发生器以及安装在稳压段前的撒播器,有效地使示踪粒子均匀地与主流混合,并成功对某扩压叶栅在设计攻角下的叶栅流道及尾迹速度场进行测量,获得了进口马赫数从0.3至0.73的二维速度矢量场。为了验证PIV试验结果的可靠性,对叶栅流场进行了数值模拟。结果对比表明:采用PIV技术测得的叶栅中截面二维速度矢量场合理地反映了叶片槽道及尾迹的流动结构,与数值模拟结果较为接近;对于跨、超音速或大攻角下叶栅流场,需考虑是示踪粒子壁面污染对测量的影响。本研究提出的PIV测量技术可应用于基于吸附式、合成射流等流动控制技术的高亚音速叶栅流场的测量。
Aiming at the problem of the tracer particles encountered by PIV technology in the transient subsurface subsonic subsputtering cascade flow field measurement, the present study adopted a high-pressure atomizing particle generator and a pre-installed sowing device, Effectively mixing tracer particles evenly with the mainstream, and successfully measuring the cascade flow velocity and the wake velocity field of a diffuser cascade at a design attack angle, and obtaining the two-dimensional velocity of the imported Mach number from 0.3 to 0.73 Vector field. In order to verify the reliability of the PIV test results, the cascade flow field is numerically simulated. The results show that the two-dimensional velocity vector field in the cascade measured by PIV technology reasonably reflects the flow structure of the blade channel and the wake, which is close to the numerical simulation results. For the cross supersonic, The gate flow field needs to be considered as the influence of the contamination of the tracer particle wall on the measurement. The PIV measurement technology proposed in this study can be applied to the measurement of the flow field of high subsonic cascades based on the flow control technology of adsorption and synthetic jet.