液力缓速器动态制动过程特性预测方法

The retarder rotor speed is not only the input parameter of retarder, but also the result of braking torque and vehicle inertia, and traditional CFD method which demands a given speed can not simulate the change of rotor speed and consequent flow field accurately. Aiming at this problem, flow-rotation coupled method was applied to embody the inertia of the whole vehicle on the rotor and angular acceleration was determined by this inertia and torque generated from the flow field. In this way, the behavior of speed can be determined and used as the input for simulation of the whole dynamic braking procedure. Comparison of the simulation results and experimental data proves that the method is of good accuracy and can be used to predict the change of rotor speed and brake torque under the interaction of internal flow and inertia of the vehicle.