Research On 3D Parameterized Optimization Of Turbomachinery Components

For a long time,turbomachinery has continued to play an indispensable role in China’s economic and social development and military and national defense construction.The design of advanced,efficient,compact and economically applicable turbomachinery has increasingly become a good vision in the field of modern turbomachinery design and manufacturing.This paper constructs a widely used three-dimensional parameterized optimization design platform for turbomachinery components,and evaluates the reliability of the parameterized optimization platform with specific turbomachinery components such as axial compressors,centrifugal compressors,volutes,and radial inflow turbines.In addition,this thesis also conducts a parametric study on the labyrinth seal in the turbomachinery.The main content includes the following three aspects:1.The parametric design,numerical calculation and optimization algorithm are organically combined to build the three-dimensional parameterized optimization platform for turbomachinery components in this article.The paper briefly introduces the parametric design method,and then discusses the optimization algorithm involved in the research,and then couples the two to form the three-dimensional parameterized optimization platform for turbomachinery components constructed in this article.The reliability of parametric modeling is verified numerically through two typical examples of the axial compressor Rotor37 blade and a centrifugal impeller with a Krain pressure ratio of 4.7.The results show that the three-dimensional parameterized method in the optimization platform has certain accuracy and feasibility.2.The constructed optimization platform is used to carry out a three-dimensional parameterized optimization study on a certain type of intake volute.The paper first carries out numerical calculation and aerodynamic analysis of this type of volute.Then,the parameterized modeling and optimization of the volute are carried out through the parameterized optimization platform.Finally,the optimization results are analyzed.The results show that the total pressure recovery coefficient of the optimized volute is 1.0007%higher than the original design,and the total pressure loss is 19.73% lower than the original design.3.The constructed optimization platform is used to carry out a three-dimensional parameterized optimization study on a certain type of radial inflow turbine.The parametric study of the impeller backface labyrinth seal structure is also carried out on the optimized radial inflow turbine.In this paper,numerical calculation and aerodynamic analysis of this type of radial inflow turbine are first carried out.Then based on the parameterized optimization platform,the radial inflow turbine impeller and guide vane are respectively carried out parameterized modeling and multi-objective performance optimization research,and finally the optimization results are analyzed.Based on the optimized radial inflow turbine,this thesis also conducts a parametric study on the impeller backface labyrinth seal,and calculates the leakage and axial force of the turbine.The results show that the isentropic efficiency of the optimized radial inflow turbine is 2.364% higher than the original design,and the total pressure is 0.129% higher than the original design.For a certain type of radial inflow turbine studied in this paper,the use of labyrinth seals can significantly inhibit the leakage at the impeller backface cavity.The average reduction rates of turbine axial force and leakage mass flow are 5.543% and 24.495% respectively.