某型涡轴发动机叶片锯齿形叶冠优化设计应用

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

以某型航空涡轴发动机涡轮叶片叶冠为研究对象进行结构优化设计。根据叶冠的特点建立了叶冠优化设计的数学模型,确定了叶冠的设计变量、目标函数和约束函数,建立了叶冠的优化设计流程,研究以叶冠工作面上应力最小和叶冠重量最轻为目标函数;以预扭角、工作面偏转角等叶冠的结构尺寸为设计变量;以结构、强度和振动要求为约束条件。运用可视化编程(VC)、UG/OPEN API函数和APDL语言将建立的参数化模型与有限元结构强度分析进行集成,并利用多学科优化软件i SIGHT完成对带锯齿冠叶片的结构优化,得到了的优化设计结果。经过优化后的锯齿冠叶片的应力分布与优化前相比更加合理,叶冠的重量相比优化前降低了0.982%,锯齿冠工作面上的应力降低了22.83%。

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.