摘要
在数值模拟中,几何结构的简化可以有效提升计算效率,降低计算成本。采用基于三维、定常、可压缩的雷诺平均纳维斯托克斯方程(RANS)模型,并充分考虑热辐射,研究3种底部结构简化模型(A、B、C)对地铁列车底部流场以及直线电机表面温度分布的影响,从而评估简化模型的计算精度和效率。研究结果表明:简化底部结构可减小电机后方的尾流面积,使底部流动增强;模型越简化,冷却空气的流量越高,通过简化几何结构可以影响走行风的流通性;冷却风量增加可影响电机的对流换热,相比于原始模型,这3种简化模型使得各电机的温度的平均值分别降低1.2%、2.4%和7.5%;若要在保证计算精度的前提下提高计算效率,考虑到车底的流场分布规律和温度场计算结果,则需对原始模型的转向架的轮轴、刹车盘、横向拉杆和悬挂装置等结构进行简化。
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.
作者
马江川
杨明智
钱博森
MA Jiangchuan;YANG Mingzhi;QIAN Bosen(Key Laboratory of Traffic Safety on Track of Ministry of Education,School of Traffic&Transportation Engineering,Central South University,Changsha 410075,China;Joint International Research Laboratory of Key Technology for Rail Traffic Safety,Central South University,Changsha 410075,China)
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2024年第5期1723-1733,共11页
Journal of Central South University:Science and Technology
基金
国家自然科学基金资助项目(52202453)
国家重点研发项目(2022YFB4301203)
中国科协青年托举项目(2021QNRC001)
中南大学自主探索创新项目(2023ZZTS0339)。
关键词
地铁列车
简化模型
车底流动
散热
subway train
simplified model
underbody flow
heat dissipation
