风洞尺寸对高速列车气动性能的影响OA北大核心CSTPCD
Influence of wind tunnel size on aerodynamic performance of high-speed train
采用单因素变量法则,研究风洞尺寸对高速列车气动性能的影响.基于DDES湍流模拟方法采用不可压缩Navier-Stokes方程求解三维非定常流场,得到不同风洞尺寸下1꞉8缩比的高速列车气动性能,并通过与风洞试验结果的对比验证仿真结果的可靠性.研究结果表明:随着风洞尺寸的减小,风洞的阻塞比增大,列车周围气流加速效应更加明显,导致列车表面正负压强均增大,涡强度增加,所受气动阻力、升力增大,当风洞阻塞比从0.61%增加到4.17%时,列车气动阻力增加15%.为获得更好的试验结果,应尽量在大尺寸风洞中进行风洞试验,以减小风洞阻塞效应对实验结果的干扰.
The influence of wind tunnel dimensions on the aerodynamic performance of high-speed trains was investigated by single-factor variable method.The unsteady flow fields were analyzed by three-dimensional,incompressible Navier-Stokes equation based on the detached eddy simulation(DDES)method,and the aerodynamic performance of high-speed train at 1꞉8 scale model in different wind tunnel sizes was obtained.The reliability of the method was validated through comparison with wind tunnel test result.The results indicate that as the wind tunnel dimensions decrease and the blockage ratio between the model and the wind tunnel increases,the airflow acceleration around the train becomes more pronounced.As a result,the positive and negative pressures on the train surface increase,which enhances the vortex strength,and leads to an increase in aerodynamic forces on the train.Specifically,when the wind tunnel blockage ratio increases from 0.61%to 4.17%,the aerodynamic drag on the train increases by 15%.To obtain more accurate test results,wind tunnel experiments for high-speed trains should preferably be conducted in larger-sized wind tunnels,to reduce the interference of the wind tunnel blockage effect on the test results.
张业;杜健;尚克明
中车青岛四方机车车辆股份有限公司,山东青岛,266111
交通运输
高速列车气动特性风洞尺寸分离涡方法(DES)
high speed trainaerodynamic performancewind tunnel sizedetached eddy simulation(DES)
《中南大学学报(自然科学版)》 2024 (005)
1880-1888 / 9
国家自然科学基金资助项目(52372369)(Project(52372369)supported by the National Natural Science Foundation of China)
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