Abstract: The simulation of the ground effect has always been a technical difficulty in wind tunnel tests of high-speed trains. In this paper, large eddy simulation and the curl acoustic integral equation were used to simulate the flow-acoustic field results of high-speed trains under four ground simulation systems (GSSs): “moving ground+rotating wheel”, “stationary ground+rotating wheel”, “moving ground+stationary wheel”, and “stationary ground+stationary wheel”. By comparing the fluid-acoustic field results of the four GSSs, the influence laws of different GSSs on the flow field structure, aero-acoustic source, and far-field radiation noise characteristics were investigated, providing guidance for the acoustic wind tunnel testing of high-speed trains. The calculation results of the aerodynamic noise of a 350 km/h high-speed train show that the moving ground and rotating wheel affect mainly the aero-acoustic performance under the train bottom. The influence of the rotating wheel on the equivalent sound source power of the whole vehicle was not more than 5%, but that of the moving ground slip was more than 15%. The average influence of the rotating wheel on the sound pressure level radiated by the whole vehicle was 0.3 dBA, while that of the moving ground was 1.8 dBA.

地面效应对高速列车流场结构及气动噪声的影响

[1]KouroussisG, ZhuSY, VogiatzisK, 2021. Noise and vibration from transportation. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 22(1):1-5.

[2]KwonHB, ParkYW, LeeDH, et al., 2001. Wind tunnel experiments on Korean high-speed trains using various ground simulation techniques. Journal of Wind Engineering and Industrial Aerodynamics, 89(13):1179-1195.

[3]LiangXF, LiuHF, DongTY, et al., 2020. Aerodynamic noise characteristics of high-speed train foremost bogie section. Journal of Central South University, 27(6):1802-1813.

[4]LiuJL, ZhangJY, ZhangWH, 2013. Study of computational method of far-field aerodynamic noise of a high-speed train considering ground effect. Chinese Journal of Computational Mechanics, 30(1):94-100 (in Chinese).

[5]LiuW, GuoD, ZhangZ, et al., 2019. Effects of bogies on the wake flow of a high-speed train. Applied Sciences, 9(4):759.

[6]PazC, SuárezE, GilC, 2017. Numerical methodology for evaluating the effect of sleepers in the underbody flow of a high-speed train. Journal of Wind Engineering and Industrial Aerodynamics, 167:140-147.

[7]WangSB, BurtonD, HerbstA, et al., 2018. The effect of bogies on high-speed train slipstream and wake. Journal of Fluids and Structures, 83:471-489.

[8]TanXM, LiuHF, YangZG, et al., 2018. Characteristics and mechanism analysis of aerodynamic noise sources for high-speed train in tunnel. Complexity, 2018:5858415.

[9]TyllJS, LiuD, SchetzJA, et al., 1996. Experimental studies of magnetic levitation train aerodynamics. AIAA Journal, 34(12):2465-2470.

[10]XiaC, ShanXZ, YangZG, 2016. Influence of ground configurations in wind tunnels on the slipstream of a high-speed train. The 8th International Colloquium on Bluff Body Aerodynamics and Applications.

[11]XiaC, ShanXZ, YangZG, 2017. Comparison of different ground simulation systems on the flow around a high-speed train. Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit, 231(2):135-147.

[12]YiSH, ZouJJ, WuGF, et al., 1997. Experimental investigation for ground effects of the high speed train models on a plate with uniform boundary layer suction. Experiments and Measurements in Fluid Mechanics, 11(2):95-100 (in Chinese).

[13]ZhangJ, LiJJ, TianHQ, et al., 2016. Impact of ground and wheel boundary conditions on numerical simulation of the high-speed train aerodynamic performance. Journal of Fluids and Structures, 61:249-261.

[14]ZhuJY, HuZW, ThompsonDJ, 2017. The effect of a moving ground on the flow and aerodynamic noise behaviour of a simplified high-speed train bogie. International Journal of Rail Transportation, 5(2):110-125.