Water medium retarders for heavy-duty vehicles:Computational fluid dynamics and experimental analysis of filling ratio control method  

作　　者：郑宏鹏 雷雨龙 宋鹏翔 

机构地区：[1]State Key Laboratory of Automotive Simulation and Control,College of Automotive Engineering,Jilin University,Changchun 130022,China

出　　处：《Journal of Hydrodynamics》2017年第6期1067-1075,共9页水动力学研究与进展B辑（英文版）

基　　金：supported by the Program for New Century Excellent Talents in University(Grant No.NCET-08-0248);the 985 Project Automotive Engineering of Jilin University

摘　　要：The water medium（WM） retarder is an auxiliary braking device that could convert the kinetic energy of the vehicle to the thermal energy of the coolant, and it is used instead of the service brake under non-emergency braking conditions. This paper analyzes the flow distribution based on a mathematical model and analyzes the key factors that could affect the filling ratio and the braking torque of the WM retarder. Computational fluid dynamics（CFD） simulations are conducted to compute the braking torque, and theresults are verified by experiments. It is shown that the filling ratio and the braking torque can be expressed by the mathematical model proposed in this paper. Compared with the Reynolds averaged Navier-Stokes（RANS） turbulent model, the shear stress transport（SST） turbulent model can more accurately simulate the braking torque. Finally, the flow distribution and the flow character in the WM retarders are analyzed.The water medium（WM） retarder is an auxiliary braking device that could convert the kinetic energy of the vehicle to the thermal energy of the coolant, and it is used instead of the service brake under non-emergency braking conditions. This paper analyzes the flow distribution based on a mathematical model and analyzes the key factors that could affect the filling ratio and the braking torque of the WM retarder. Computational fluid dynamics（CFD） simulations are conducted to compute the braking torque, and theresults are verified by experiments. It is shown that the filling ratio and the braking torque can be expressed by the mathematical model proposed in this paper. Compared with the Reynolds averaged Navier-Stokes（RANS） turbulent model, the shear stress transport（SST） turbulent model can more accurately simulate the braking torque. Finally, the flow distribution and the flow character in the WM retarders are analyzed.

关 键 词：Heavy duty vehicle braking system water medium retarder computational fluid dynamics filling ratio control method 

分 类 号：O35[理学—流体力学] U463.5[理学—力学]