Study on Idling Characteristics of Hydraulic Torque-Retarder Assembly

Definition of boundary conditions of hydraulic torque-retarder assembly (HTRA) in different working conditions is the basic of computational fluid dynamics (CFD). The performance of stator in locking condition was calculated by CFD based on some given hypotheses. In order to analyze the idling in traction and braking work condition of HTRA, combined with factorial design and quadratic-multinomial fitting, the prediction of rotation speed of brake impellers was obtained and the variation of brake impeller torque with impeller speed in traction condition was studied. In addition, the idling speed of stator impeller in braking condition was studied also. The prediction of traction and braking characteristics based on three-dimensional flow theory was verified feasibly and accurately by bench test.