Effect of simplifying metro train bottom geometric structure on flow and motor heat dissipation

被引：0
|
作者：
Ma, Jiangchuan [1 ,2 ]
Yang, Mingzhi [1 ,2 ]
Qian, Bosen [1 ,2 ]
机构：
[1] Key Laboratory of Traffic Safety on Track, Ministry of Education, School of Traffic & Transportation Engineering, Central South University, Changsha,410075, China
[2] Joint International Research Laboratory of Key Technology for Rail Traffic Safety, Central South University, Changsha,410075, China
来源：
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2024年 / 55卷 / 05期
关键词：
In numerical simulation; the simplification of geometrical structures can effectively improve the computational efficiency and reduce the computational cost. In this study; a three-dimensional; constant; compressible Reynolds-averaged Navier-stokes (RANS) equation-based model with thermal radiation was used to investigate the effects of three simplified models (A; B and C) of the bottom structure on the bottom flow field of a subway train as well as on the surface temperature distribution of the linear motors; and evaluate the computational accuracy and efficiency of the simplified models. The results show that the simplification of the bottom structure reduces the wake area behind the motor; which enhances the bottom flow. The more simplified the model; the higher the flow rate of the cooling air; and the circulation of the traveling air can be affected by the simplified geometric structure. The increase of cooling air flow affects the convective heat transfer of the motors; and compared with the original model; the three simplified models make the average value of the temperature of each motor decrease by 1.2%; 2.4%; and; 7.5%; respectively. In order to improve the calculation efficiency on the premise of guaranteeing the calculation accuracy; considering the flow field distribution law and the temperature field calculation results of the underbody; only the structure of wheel axle; brake disk; transverse tie rod and suspension device of the bogie of the original model should be simplified. © 2024 Central South University of Technology. All rights reserved;
D O I：
10.11817/j.issn.1672-7207.2024.05.006
中图分类号：
学科分类号：
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页码：1723 / 1733
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