基于结构可靠性的涡轮叶片三维气动设计优化

Three Dimension Aerodynamic Design Optimization of Turbine Blade Based on Structural Reliability

将结构静强度可靠性、疲劳可靠性以及刚度可靠性作为基本约束条件,对某涡轮静、动叶片进行了三维气动设计优化。建立了涡轮叶片结构可靠性气动设计优化模型,给出了叶片热-流-固耦合分析流程及气动设计优化代价函数。结果表明:优化后,静、动叶片的气动效率均值分别提高了2.45%和6.17%,且气动效率的标准方差也有一定减小;优化后,动叶片的各项结构可靠度指标得到提高,且达到设计要求;动叶片的结构系统可靠度从91.3%提高到了99.87%。

Taking the strength reliability, fatigue reliability and stiffness reliability as the basic constraint conditions, the three dimension aerodynamic optimization was done for a turbine guide blade and rotating blade. First, an aerodynamic design optimization model of blade structural reliability was established. And the thermal-fluid-solid coupling analysis process and the aerodynamic design optimization cost function were gained. The results proved that： after optimization, the aerodynamic efficiency of the guide blade and rotating blade are promoted by 2.45% and 6.17% respectively, and the standard deviation of the aerodynamic efficiency is reduced to some extent at the same time; every structural reliability indexes are promoted to satisfy the design requirements; the structural system reliability of the rotating blade is increased from 91.3% to 99.87%.