关键词: 汽车工程, 辅助制动, 电涡流缓速器, 强化散热, 结构优化

Abstract: Kinetic energy of automobile could be transformed into heat energy when an eddy current retarder (ECR) starts braking. The temperature on the rotor plate rises rapidly to result in instable braking performance because of heat energy. For the above question, a cylindrical disturbance setup with forced heat dissipation is proposed to be installed in the rotor plate. To select the reasonable cylinder dimensions, the physical models of single tunnel are established. Heat exchange mechanism and performance of every model are analyzed using K-ε standard double equations and energy equation on condition that inlet airflow velocity is variable, and compared to the original model without disturbance components. The results show that the pressure drop increases with increase in cylinder diameter, the average convective heat transfer coefficient of former row is higher than that of next one, and the higher strengthening heat transfer coefficients on work plane and back plane of the blade are achieved after the disturbance components are installed, furthermore their effect on former is greater than on latter.

Key words: automotive engineering, auxiliary brake, eddy current retarder, forced heat dissipatio, structure optimization