Fluid-thermal-machanical Coupling Calculation And Optimization Design Of Twin-web Turbine Disk

In the working process of aero engine,the environmental condition of turbine rotor is the most severe.As one of the core components of the engine turbine rotor,the working environment of the turbine disk is very complex.Its flow field temperature and pressure are very high,and the temperature field changes very violently,which has a great impact on the flow field and the solid structure.The interaction between multiple physical fields is involved in the working process.Compared with the traditional single-web turbine disk,the twin-web turbine disk has the characteristics of reducing the working temperature,reducing the mass,reducing the amount of cold air,and increasing the AN2 value.In this paper,three kinds of turbine disks,including single-web turbine disk,internal cavity turbine disk and core groove turbine disk,are parametrically modeled,and the specific parameter settings are given.The two-dimensional triangular mesh is generated automatically by self-made program.Judging from the result,the quality of the generated mesh is high.At the same time,proper grid encryption in places where the turning is severe can ensure geometric integrity and effectively capture the complex flow of fluid.Secondly,in this paper,the flow-thermal-machanical coupling calculation of twin-web turbine disk is carried out.According to the actual situation of this paper,the one-way flow-thermal-machanical coupling method is adopted.The calculation results show that compared with the single-web turbine disk,the mass of the two kinds of twin-web turbine disks is significantly reduced,while the stress,strain and deformation change in different degrees.Among them,the Von Mises stress and total equivalent strain of the internal cavity turbine disk increase slightly,and the stress and strain of the core groove turbine disk increase greatly.The total deformation of the three kinds of turbine disks is almost equal.Obviously,the performance of the internal cavity turbine disk is better than that of the core groove turbine disk.Finally,the optimization design is carried out through the self-programming optimization platform,which integrates the parametric modeling function and the self-made mesh program.It can also call the ANSYS software for calculation,and optimize through the genetic algorithm.The calculation results show that the platform is reliable and the calculation results are accurate,which is suitable for the calculation of simplified structure turbine disk.After calculation of the three types of turbine disks,it is found that compared with the original model,the internal cavity turbine disk is significantly reduced in mass while the stress increase is extremely small,and the stress increase of the core groove turbine disk is slightly larger.However,compared with the results of flow-thermal-machanical coupling calculation,the increase of both is significantly reduced.Therefore,the optimized turbine disk structure is obviously more reasonable.