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针对PIV技术在暂冲式高亚声速平面叶栅流场中遇到的示踪粒子投放问题,通过采用高压雾化式粒子发生器以及安装在稳定段前的撒播器,有效地使示踪粒子均匀地与主流混合,并成功开展了某扩压平面叶栅叶片槽道及出口尾迹可视化测量,获得了零迎角、进口马赫数0.2~0.8状态下的二维速度矢量场。为了验证PIV在叶栅流场测试结果的可靠性,在相同工况下,将PIV测量结果分别与数值计算结果和三孔尾迹探针测量结果进行了对比分析。结果表明: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;PIV与三孔楔形尾迹探针在叶栅出口尾迹的测量所获得的气流速度和主流区的出口气流角重合性较好;尾迹分离区的出口气流角重合性略差,主要原因是尾迹区气流角超出了探针校准范围,这也说明了PIV测试技术优势。本文提出的PIV测量技术也可用于连续式叶栅风洞中。
In view of the problem of the tracer particle placement encountered by PIV technology in the transient high-subsonic cascade flow field, by using the high-pressure atomizing particle generator and the emitter installed in front of the stable section, the tracer particle And uniformly mixed with the mainstream, and successfully carried out a diffuser plane vane vane channel and the outlet of the visual measurement, get the zero-angle of attack, the Mach number 0.2 to 0.8 import state of the two-dimensional velocity vector field. In order to verify the reliability of PIV flow field in cascades, PIV measurement results were compared with numerical results and three-hole wake probe measurements under the same conditions. 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. The PIV and the three- The wake velocity measured by the wake coincides well with the exit airflow angle in the main stream. The coincidence of the exit airflow angle in the wake separation zone is slightly worse, mainly due to the wake angle being beyond the calibration range of the probe, which also shows PIV test technology advantage. The proposed PIV measurement technique can also be used in continuous cascaded wind tunnels.