流固耦合在涡轮多学科优化设计中的应用

Application of Fluid-solid Coupling on Multidisciplinary Optimization Design for Turbine Blades

针对以往的多学科优化设计(MDO)中未能考虑高精度的耦合分析,开展了涉及耦合分析的多学科优化方法研究。以涡轮叶片为研究对象,兼顾优化效率和精度,提出了涉及耦合的涡轮叶片多学科优化策略。该策略以协同优化(CO)策略作为框架,将可变复杂度建模方法(VCM)和3种精度(高、中、低)模型嵌入其中。其中,通过两点式标度函数和周期更新方法提高可变复杂度建模方法管理3种精度模型的能力。3种精度模型包括涡轮叶片的流固耦合分析、单学科分析和响应面近似方程。最终解决了涡轮叶片多学科优化设计精度和效率的难题,得到可行的最优化结果。

This paper is a study on the multidisciplinary design optimization （MDO） involving coupling, because the MDO in the past failed to consider the coupling analysis of high precision. Taking both optimization efficiency and precision into con- sideration, this paper constructs a turbine blade optimization strategy with coupling based on collaborative optimization （CO）. This strategy incorporates the variable complexity method （VCM） which is improved by the two-point scale function and the periodic updating technology and three accuracy classes （high, middle, low） of the analysis models, i. e. the fluid- solid coupled analysis, the single discipline analysis and the response surface approximate equation. The new strategy solves the difficulty of precision and efficiency, and shown to be able to complete the turbine MDO with satisfactory perform- ance.