Optimized Design and Applications of the Zigzag Blade Shrouds in Turbo-shaft Engines

With a turbine blade shroud in a turbo-shaft engine serving as the object of study,its structural optimization and design were performed. According to the specific features of the blade shroud,a mathematical model for optimized design of blade shrouds was established with the design variables,target functions and restriction functions of the blade shroud being determined and the optimized design flow path for the blade shroud being established. In this connection,the minimal stress on the working surface of the blade and the lightest weight of the blade shroud serve as the target functions,such structural dimensions of the blade shroud as the pre-twisted angle and deflection angle on the working surface etc. serve as the design variables and the structure,strength and vibration requirements serve as the restraint conditions. The visualization programming( VC),UG / OPEN API function and APDL language were used to integrate the parameterization model thus established with the finite element strength analysis and the multi-discipline optimization software i SIGHT was employed to fulfill the structural optimization of the blades with zigzag shrouds with the optimized design results being obtained. The stress distribution on the zigzag-shrouded blades after the optimization is more rational than that before the optimization and the weight of the blade shroud becomes lighter than that before the optimization.