Some Applications Of Mesh Morphing In Internal Flow Components

Mesh morphing is a hot topic in recent years.It has the advantages of simple operation,high flexibility,and no need to re-mesh.In this paper,the parametric method based on mesh morphing is used to optimize a square-to-circle inlet,an S-duct inlet,and a radial flow turbine,and achieve the improvement of performance respectively.This technology is further used to complete hot and cold state conversion of a compressor blade.The main research contents of the paper include:1.Based on the mesh morphing,aerodynamic analysis and performance optimization of a square-to-circle inlet,a S-duct inlet and a radial turbine are carried out.Automatic optimization of aerodynamic performance can be achieved by setting reasonable control points and deformation groups for the model and coupling with appropriate optimization methods.For the square-to-circle inlet,the parameters such as total pressure recovery coefficient and outlet uniformity are improved after optimization.For the S-duct inlet,the optimized flow field separation area is significantly reduced,the outlet Mach number distribution is more uniform,and the performance of total pressure recovery coefficient,total pressure distortion index and outlet verticality are improved to varying degrees.For radial flow turbines,the isentropic efficiency increases at both the design and off-design points after optimization.2.Based on the mesh morphing,a process of cold and hot state conversion is built.Taking the NASA Rotor 37 blade as the research object,the flow field simulation and load analysis were carried out,and the stress and strain results of the blade under multiple loads were obtained.The mesh deformation is realized by shape matching,and the approximate cold state model can be obtained by loading the original model with the appropriate deviation.After iterative calculation,the maximum node deviation between hot model obtained from the cold model and original model is 0.0064 mm.It has been verified that the hot model has basically the same aerodynamic performance as the original model.