涡轮转子凹槽叶尖控制泄漏流动的数值研究

To optimize the structure of cavity tip and improve the efficiency of turbine, it is critical to comprehend the mechanism behind leakage flow control of the cavity tip. The leakage flow of cavity tip in a transonic high-pressure turbine blade is studied numerically. The difference in leakage loss and flow structure between the cavity tip and flat tip is analyzed, while also examining the effects of flow structure in the cavity on the leakage flow. It is found that the leakage flow is blocked by the cavity tip in two regions, which are affected by suction side cavity vortex and scraping vortex. The flow structure undergoes variations with changes in the casing relative velocity, which will impact the leakage flow. The results of this study can provide valuable insights for the design of cavity tips.