基于网格参数化变形的单级涡轮多学科可靠性设计优化

On basis of free-form deformation method, a parameterized mesh deformation to morph coordinately fluid analysis mesh and structure analysis mesh was proposed, and reliability-based multidisciplinary design optimization of single turbine stage with parameterized mesh deformation was introduced. According to the extended feature of blade in spanwise direction, the mesh deformation of 3D analysis mesh was translated to the mesh deformation of 2D cross section analysis mesh at different blade height. Control plane for 2D cross section was designed on basis of topological structure of the 2D fluid analysis mesh. The coordinates of blade profile control points were calculated by aerodynamic design parameters. The movements of other control points in 2D control plane were obtained according to the movement of blade profile control points in order to improve the quality of the deformed mesh. The mesh deformation of 3D fluid analysis mesh could be carried out by the control volume composed of 2D control planes at different blade heights. Structure analysis mesh was morphed by using the same control volume for 3D fluid analysis mesh deformation in order to obtain the coordinate mesh deformation on interface mesh. Reliability-based multidisciplinary design optimization with proposed parameterized mesh deformation method was used to optimize single turbine stage. Results showed that the efficiency was improved by 4.97% and the blade life was improved by 40.86% under satisfying the reliability constraint, proving the effectiveness of the developed method.