CFD Analysis based Torque Converter Performance Prediction Model with Equivalent Parameters

Abstract:

The correlation between parameters of one dimensional flow model and computational fluid dynamics (CFD) results is derived from guaranteeing precision of estimation of incidence loss. Energy loss within each impeller passages are extracted from CFD results, and the exact energy loss coefficients are achieved by the least mean square method which minimizes the deviation of the calculated energy loss from CFD results. Then, the component of energy loss is analyzed, which provides reference for further modification of design. The one dimensional flow model is modified by taking account of the equivalent parameters and energy loss coefficients, and the deviation of predictive pump torque capacity from CFD results is reduced within 3.2%. Furthermore, this deviation still keeps less than 7.3% after modifying the shape parameters of blades which leads to 6.9% increment of torque capacity at rotating stall and 2.5% decrement of peak efficiency.