典型涡轮气冷叶片参数化建模及优化设计

In order to better ensure the comprehensive aerodynamic performance of turbine air-cooled blades in the structural strength design stage，based on the traditional four-line modeling method of two-dimensional cascade， two parameters， i.e. throat width and trailing edge bending angle， were introduced to ensure the aerodynamic performance. A modeling method based on free curve for irregular cooling air inlet was proposed to alleviate the stress concentration problem at the cold air inlet and its potential value was demonstrated by optimization calculation. On this basis，the typical cooling structure inside the turbine air-cooled blade was modeled parametrically. The mass of blade and the maximal tensile stress of blade body were taken as the optimization objectives，and parameters were selected to optimize turbine air-cooled blades. After optimization，the mass of blade decreased by 0.99% and maximum tensile stress decreased by 6.55%. The optimization results showed that the relevant parameterization method can meet the design requirements of turbine blades with complex internal cooling structure，and can effectively improve turbine design efficiency.