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Open Access

ARTICLE

Numerical and Experimental Analysis of the Aerodynamic Torque for Axle-Mounted Train Brake Discs

Nan Liu1,2, Chen Hong3,4,5, Xinchao Su3,4,5, Xing Jin1,2, Chen Jiang3,4,5,*, Yuqi Shi1,2, Bingkun Wang1,2
1 Brake System Laboratory, CRCC (Qingdao) Vehicle Inspection Station Co., Ltd., Qingdao, 266031, China
2 Brake System Laboratory, CRRC Qingdao Sifang Rolling Stock Research Institute Co., Ltd., Qingdao, 266031, China
3 The State Key Laboratory of Heavy-Duty and Express High-Power Electric Locomotive, Central South University, Changsha, 410075, China
4 Key Laboratory of Traffic Safety on Track of Ministry of Education, School of Traffic & Transportation Engineering, Central South University, Changsha, 410075, China
5 National & Local Joint Engineering Research Center of Safety Technology for Rail Vehicle, Changsha, 410075, China
* Corresponding Author: Chen Jiang. Email: jiangchen2007@hotmail.com

Fluid Dynamics & Materials Processing https://doi.org/10.32604/fdmp.2024.047427

Received 05 November 2023; Accepted 25 March 2024; Published online 19 April 2024

Abstract

As the velocity of a train increases, the corresponding air pumping power consumption of the brake discs increases proportionally. In the present experimental study, a standard axle-mounted brake disc with circumferential pillars was analyzed using a 1:1 scale model and a test rig in a wind tunnel. In particular, three upstream velocities were selected on the basis of earlier investigations of trains operating at 160, 250, and 400 km/h, respectively. Moreover, 3D steady computational fluid dynamics (CFD) simulations of the flow field were conducted to compare with the wind tunnel test outcomes. The results for a 3-car train at 180 km/h demonstrated: (1) good agreement between the air resistance torques obtained from the wind tunnel tests and the related numerical results, with differences ranging from 0.95% to 5.88%; (2) discrepancies ranging from 3.2 to 3.8 N · m; (3) cooling ribs contributing more than 60% of the air resistance torque; (4) the fast rotation of brake discs causing a signifi- cantly different flow field near the bogie area, resulting in 25 times more air pumping power loss than that obtained in the stationary brake-disc case.

Keywords

Axle-mounted train brake disc; aerodynamic torque; wind tunnel test; numerical simulation

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