Abstract:Based on ANSYS FLUENT 145 simulation platform, using RNG κ-ε double equation model and SIMPLEC solution algorithm based on pressurespeed, numerical simulation analysis was carried out in internal flow field of wholeflowpassage of VR120 hydraulic retarder. Brakingtorque was obtained in different speed, and relation formula was established between torque and speed by data fitting. Meanwhile, brakingtorque of hydraulic retarder in different speed was measured by transient test bed, and compared with results of numerical simulation analysis. The results show that the test value and the simulation analysis have the same trend of changing, both errors less than 10%. It was verified that the simulation analysis of hydraulic retarder by using SIMPLEC algorithm is feasible and effective, which will provide reference for further design of hydraulic retarder.