TY - JOUR
T1 - Numerical comparisons of the aerodynamic performances of wind-tunnel train models with different inter-carriage gap spacings under crosswind
AU - Xia, Yutao
AU - Liu, Tanghong
AU - Li, Wenhui
AU - Dong, Xiao
AU - Chen, Zhengwei
AU - Guo, Zijian
N1 - Funding Information:
The authors acknowledge the computational resources provided by the High-Speed Train Research Center of Central South University, China. This work was supported by the National Railway Administration of China (Grant No. 18T043 ), the National Railway Administration of China (Grant No. 2018Z035 ), and the Fundamental Research Funds for the Central Universities of Central South University (Grant No. 2021zzts0163 and 2021zzts0170 ).
Funding Information:
The authors acknowledge the computational resources provided by the High-Speed Train Research Center of Central South University, China. This work was supported by the National Railway Administration of China (Grant No. 18T043), the National Railway Administration of China (Grant No. 2018Z035), and the Fundamental Research Funds for the Central Universities of Central South University (Grant No. 2021zzts0163 and 2021zzts0170).
Publisher Copyright:
© 2021 Elsevier Ltd
PY - 2021/7
Y1 - 2021/7
N2 - Reasonable gap spacings between adjacent train vehicle models are of great significance for the data accuracy during a wind tunnel test. In this research, crosswind flows around 1/8th-scale high-speed train models with inter-carriage gap spacings of 0, 5, 8, 10, and 20 mm are studied using improved delayed detached eddy simulation (IDDES) with the SST (shear-stress transport) k-omega model. The numerical methodology is first validated against the wind tunnel experiment data. Then, the effects of gap spacings on aerodynamic loads and the flow field around the train are investigated. The results indicate that the side force of the tail car significantly increases with the gap spacing, in which the maximum difference occurs at 20 mm compared with the zero gap spacing, whereas the difference in the drag decreases. When the gap spacing is greater than 10 mm, the time-averaged pressure distribution, flow pattern and transient flow structures around the inter-carriage gap regions observe a significant difference from other gap spacings. Considering the overall aerodynamic effects induced by gap spacings and the practical handleability during a wind tunnel test, a gap spacing between 5 mm and 10 mm is therefore recommended for adjacent train vehicles with a 1/8th scale.
AB - Reasonable gap spacings between adjacent train vehicle models are of great significance for the data accuracy during a wind tunnel test. In this research, crosswind flows around 1/8th-scale high-speed train models with inter-carriage gap spacings of 0, 5, 8, 10, and 20 mm are studied using improved delayed detached eddy simulation (IDDES) with the SST (shear-stress transport) k-omega model. The numerical methodology is first validated against the wind tunnel experiment data. Then, the effects of gap spacings on aerodynamic loads and the flow field around the train are investigated. The results indicate that the side force of the tail car significantly increases with the gap spacing, in which the maximum difference occurs at 20 mm compared with the zero gap spacing, whereas the difference in the drag decreases. When the gap spacing is greater than 10 mm, the time-averaged pressure distribution, flow pattern and transient flow structures around the inter-carriage gap regions observe a significant difference from other gap spacings. Considering the overall aerodynamic effects induced by gap spacings and the practical handleability during a wind tunnel test, a gap spacing between 5 mm and 10 mm is therefore recommended for adjacent train vehicles with a 1/8th scale.
KW - Aerodynamic performances
KW - Crosswind
KW - High-speed train
KW - Inter-carriage gap
KW - Wind tunnel test
UR - http://www.scopus.com/inward/record.url?scp=85107132533&partnerID=8YFLogxK
U2 - 10.1016/j.jweia.2021.104680
DO - 10.1016/j.jweia.2021.104680
M3 - Journal article
AN - SCOPUS:85107132533
SN - 0167-6105
VL - 214
JO - Journal of Wind Engineering and Industrial Aerodynamics
JF - Journal of Wind Engineering and Industrial Aerodynamics
M1 - 104680
ER -