铸造涡轮叶片叶型优化设计研究

Blade Profile Optimization Design and Research of Casting Turbine Blade

从满足相同设计工况和降低涡轮叶片铸造难度角度,选取更适于铸造的叶型,确定影响叶片叶型的4个几何参数,即前缘楔角Φ_1、后缘楔角Φ_2、前缘半径r_1和后缘半径r_2。推导优化目标与4个叶片几何参数之间的隐式函数关系,建立基于MATLAB的涡轮叶片叶型优化数学模型,确定了易于铸造的涡轮叶片叶型的优化设计。对优化叶片进行水力性能和结构强度数值模拟分析,结果验证了该优化方法的可行性。

The four geometrical parameters affecting the blade profile were determined by selecting the blade type which was more suitable for casting, from satisfying the same design conditions and reducing the casting difficulty angle of turbine blades, such as the leading edge wedge angle 41, the trailing edge wedge angle φ2, the leading edge radius r1 and the trailing edge radius r2. The implicit function relation between the optimal target and the four blade geometry parameters was derived. A mathematical model of blade profile optimization based on MATLAB was established. Optimum design of blade profile of turbine blade was determined. The numerical simulation analysis of hydraulic performance and structural strength of the optimized blades proves the feasibility of this optimization method.