涡轮转子凹槽叶尖泄漏流动气动热力特征

In order to explore and summarize the aero-thermodynamic characteristics of the tip leakage flow of squealer tip, experimental and numerical simulation methods are used to investigate the interaction mechanism of vortices in the squealer tip cavity, the tip region heat transfer and the energy redistribution of the leakage flow. The parametric design method of the squealer tip is also discussed. The results show that the multi-functional experimental platform and the visual leakage flow measurement scheme can precisely capture the flow structure in the tip region. An aero-labyrinth liked sealing effect is formed by the scraping vortex. Its shape characteristics directly affect the leakage flow controlling of squealer tip. The heat load increased in the squealer tip is mainly caused by the leakage flow impingement on the blade surface. By reasonable working condition and squealer tip geometry for organizing scraping vortex characteristics, the squealer tip can improve the turbine aero-thermodynamic performance effectively.