TY  - EJOU
AU  - Liu, Nan 
AU  - Hong, Chen 
AU  - Su, Xinchao 
AU  - Jin, Xing 
AU  - Jiang, Chen 
AU  - Shi, Yuqi 
AU  - Wang, Bingkun 

TI  - Numerical and Experimental Analysis of the Aerodynamic Torque for Axle-Mounted Train Brake Discs
T2  - Fluid Dynamics \& Materials Processing

PY  - 2024
VL  - 20
IS  - 8
SN  - 1555-2578

AB  - 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 significantly 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.
KW  - Axle-mounted train brake disc; aerodynamic torque; wind tunnel test; numerical simulation

DO  - 10.32604/fdmp.2024.047427