Influence of Spatial Characteristic Parameters of Film Cooling Holes on the Strength of Turbine Blade

Abstract In order to improve the fatigue resistance of turbine blades with special-shaped film cooling holes in real working environments, spatial geometric characteristics gas are studied by using numerical calculation method gas-thermal-solid depth coupling, which is based on holes. Then, influence stress level and durable strength at hole edge developed, includes parameters jet angle, flow direction divergence span-wise pore diameter The results show that expansion angle spanwise most significant impacts same angle. Compared cylindrical hole, it decreased about 9.3% 25.8%, equivalent hole. increases 11.1% 25.2%.