粒子图像技术测量带尾缘吹气静子尾迹特征

PIV investigation on the wake of stator with trailing edge blowing

采用粒子图像测试技术(PIV Particle Image Velocimetry)和热线相结合的方法,对静子尾缘有无吹气条件下尾迹区流场进行测量,得到了不同尾部吹气量下的静子尾迹区的流场,通过测量得到了尾迹区的流动显示、速度矢量图和涡量图,并根据无动量亏损厚度确定了纯尾迹、弱尾迹、无动量亏损尾迹和射流四种尾迹流动特征。同时对PIV测试结果和热线测试结果进行了对比,两个实验结果比较吻合,验证了PIV实验的准确性,实验结果认为无动量亏损尾迹区与纯尾迹流动相比具有速度周向变化小和脉动小等特点。

The mixed flow field of the stator wake with and without injection was measured by PIV （ Particle Image Velocimetry） and HWA （Hot wire Anemometer） , and the flow fields have been gained in the wake of the stator with and without mass injection through a slit along the stator rear end. According to the flow visualization, velocity fields and vorticity contour maps, four wake spreading characteristics, pure wake, weak wake, momentumless wake and jet were obtained through adjusting the mass injection on the base of momentum thickness. Meanwhile, the comparisons between PIV and HWA were also made. According to comparisons, the experimental results are in well agreement. It is proved that the experiment is correct. The two experimental results show that the momentumless wake have the characteristics of small velocity fluctuation and pulsation.