涡轮叶片多学科设计优化中的多学科可行解耦

Multi-disciplinary feasible decoupling in multidisciplinary design optimization for turbine blade

关键词:  叶片  多学科设计优化+  单元内线性插值+  自由网格变形

Key words:  Blade  Multidisciplinary design optimization  Element linear interpolation  Free-form deformation

摘要:

为解决涡轮叶片多学科设计优化过程中的解耦问题,将多学科可行解耦方法应用于涡轮叶片气动、传热及结构三学科的解耦。将气动、传热分析载荷下的叶片变形作为解耦循环结束与否的判断标准;解耦循环中的关键步骤——学科间的载荷传递及变形传递分别用单元内线性插值法及自由网格变形技术实现。某涡轮叶片初始设计点的解耦算例表明,解耦循环结束前收敛标准降幅达90.74%,气动、传热及结构得到了完全解耦。整个过程表明,多学科可行解耦方法虽然解耦效率有限,但在解决学科间耦合问题时具有较好的稳定性、准确性及可操作性。

Abstract:

To solve the decoupling problem in the process of turbine blade multidisciplinary design optimization,Multi-disciplinary feasible decoupling method is applied to complete the decoupling of aerodynamics,heat transfer and structure.The blade deformation under pressure and temperature load from aerodynamic and heat transfer analysis is taken as the criteria to judge whether the decoupling circle stops.Linear interpolation and free-form deformation are used to implement the load transfer and deformation transfer among the three disciplines.Through a real application,it is indicated that the convergence criteria is descended by 90.74﹪ before decoupling circle finishes,and the three disciplines are totally decoupled.It is showed that,in the whole decoupling process,the multi-disciplinary feasible decoupling method is stable,veracious and maneuverable;however,the efficiency problem is its limitation.Some suggestions are also put forward to overcome this limitation.