Study On Optimization Design Of Hydrodynamic Torque Converter Pump Vanes

Hydraulic torque converter(HTC) as one important element in hydraulic field, with its unique torque characteristics, has been widely uesed in engineering field. And the performance of HTC need to be constantly improved, which has close relationship with wheel blade shape. So there is a important significance to develop and improve the impeller blade of HTC for improving torque converter performance.This paper has been used LB46 adjustable guide vane hydraulic torque converter for research. In order to improve the highest efficiency of torque converter, which based on the multidisciplinary optimization design software Isight, it need to optimize the design of the torque converter pump impeller blade. It’s also providing a reference for improve the torque converter performance. The main works of this paper include the following sections:①The paper introduces the basic theory about HTC, with the current domestic and foreign torque converter flow field simulation analysis of research status and the research status for the torque converter impeller blade profile optimization, leads the application research of the pump impeller blade optimization design of LB46 adjustable guide vane HTC from the current study situation of the torque converter impeller blade optimization;②The paper introduces the basic concept of fluid motion, the basic equations and the CFD solution process. Analyzed the current calculation method which based on the finite volume method CFD flow field simulation;③Based on the research for LB46 guide vane hydrodynamic torque converter pump impeller blades, integration equation for the airfoil profile expression, and the conform transformation theory, a correction was developed for pump impeller blades. From the correction, four different orders were fitted. The numerical calculation on flow filed for torque converter based on the three orders fitting and computational fluid dynamics proves the generality of the integration equation by the original characteristic curve and the experimental results;④ The multi-island genetic algorithm(MIGA) optimization model, which respectively based on Matlab genetic algorithm toolbox of genetic algorithm and the MIGA module of Isight optimization algorithms library, is established for problem solving. The global search ability and reliability test of genetic algorithm by seeking multiple multi-peak function Shubert optimal solution, show that this algorithm is suitable for pump impeller blade profile optimization problem solving;⑤The parametric optimization design of pump blade shape based on the multidisciplinary design optimization framework software Isight which integrate MIGA optimization module and fluid simulation analysis software(Fluent)module. With the experimental measurement of LB46 HTC as a original blade to optimize, and the HTC performance is significantly improved after optimization. The problem of the simultaneous solution of complex flow field calculation and shape optimization design and the automatic operation is solved. And it provides a new and reliable method for the development of design high performance HTC.