双层壁结构冷却和应力特性分析

In response to the performance requirements of high-efficiency cooling，high-reliability and long-life of turbine blades，the influences of the film hole inclination angle and the film plate thickness of a typical double-wall structure on the overall cooling efficiency，the maximum thermal stress and the maximum thermo-mechanical stress of the structure were analyzed based on the numerical method of fluid-thermal-solid coupling. The inner surface of the film plate generated large thermal stresses，especially at the edge of the film holes and pin-fins. As the film hole inclination angle decreased from 90° to 30°，the overall cooling efficiency increased significantly，but the thermo-mechanical stress under centrifugal force also increased sharply. When the film plate thickness was small， the overall cooling efficiency was affected by the impingement cooling and unevenly distributed. With the increase of the film plate thickness，the thermo-mechanical stress of the film holes and pin-fins under centrifugal force was significantly reduced.