Study On Performance Optimization Of Three-component Hydraulic Torque Converter

As one of the core components of the hydraulic transmission system,the low efficiency of the hydraulic torque converter leads to the low efficiency of the hydraulic transmission system.Therefore,optimizing the performance of the hydraulic torque converter is an important way to improve the efficiency of the hydraulic transmission system.With the development of computational fluid dynamics and computer technology,CFD can accurately simulate,calculate and analyze the internal flow field of hydraulic torque converter.Because of its low cost and short design Period,CFD has become the main tool for the design and optimization of hydraulic torque converter.The main research contents are as follows:(1)Using CFX calculation software for numerical simulation calculation;According to the results of numerical simulation,the internal flow of pump impeller,turbine,and guide wheel under various speed ratio conditions are analyzed in detail.(2)Aiming at the problem that the turbine performance of YJ355 hydraulic torque converter decreases rapidly and the distribution of energy loss of guide wheel head is uneven under medium and low speed ratio working conditions,the interaction mechanism between blades and fluid is studied by using modern methods based on flow field numerical simulation,and the impeller structure is established.By adjusting the blade placement angle and wrap angle distribution law,the turbine blade structure is continuously optimized to improve the performance of hydraulic torque converter under medium and low speed ratio working condition.After optimization,the maximum efficiency increase is 4.78%,and the maximum added value in torque ratio is 0.863.(3)It is proposed that the pump impeller and turbine of hydraulic torque converter adopt long and short blade impellers,which provides a new idea for developing high-performance hydraulic torque converter and provides greater flexibility for developing high-performance hydraulic torque converter by adopting the flexible modern design idea of tailor-made.