Internal flow field in a hydrodynamic torque converter with dynamic hybrid RANS/LES model
The traditional one-dimensional beam research method cannot describe the complex time-varying transient turbulent flow in the working cavity of a high power density torque converter.RANS,LES,DES and SBES models are efficiently coupled with fine hexahedral grids and dynamic physicochemical properties of media by setting turbulence models in CFD calculation,which provides guidance for transient simulation of hydraulic torque converter(TC)to predict its external performance and complex internal flow field distribution.The stress-blended eddy simulation(SBES)method in dynamic hybrid rans-les(DHRL)was found by qualitative and quantitative analysis of the flow structure inside the hydraulic torque converter and the sequential evolution of the quasi-ordered vortex system in the guide vane boundary layer.The boundary layer flow in the working chamber can be fully identified,and the multi-basin coupling complex flow phenomenon can be accurately captured.The maximum error of the original characteristic prediction results is less than 4%through the bench experiment.In addition,the mechanism of flow loss generation in the working chamber is also elucidated,and the flow mechanism of vortex structure generation,development,transport,fragmentation and synthesis is revealed,which provides a calculation method for the efficient development of new products and the improvement of original products.
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