TY - JOUR
T1 - Aerodynamic effects of the gap spacing between adjacent vehicles on wind tunnel train models
AU - Xia, Yutao
AU - Liu, Tanghong
AU - Gu, Houyu
AU - Guo, Zijian
AU - Chen, Zhengwei
AU - Li, Wenhui
AU - Li, Li
N1 - Funding Information:
This work was supported by the National Key R&D Program of China [grant number 2016YFB1200504] and the National Natural Science Foundation of China [grant number 51575538]. The authors acknowledge the computational resources provided by the High-Speed Train Research Centre of Central South University, China.
Publisher Copyright:
© 2020, © 2020 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.
PY - 2020/1/1
Y1 - 2020/1/1
N2 - A certain gap spacing between adjacent vehicles is usually inevitable in wind tunnel force tests of high-speed trains under no crosswind, which may affect the wind tunnel test results. Thus, to understand the influence of gap spacings on the train aerodynamics, the aerodynamic drag, pressure distributions and airflow structures of 1/8th-scale high-speed train models with gap spacings of 0, 5, 8, 10, 20, and 30 mm were studied using RANS based on SST k-ω turbulence model. The simulation method was verified by the wind tunnel experiment data. The results show that the gap spacing significantly affects the airflow structure around inter-car gap and aerodynamic resistances of train models. For the high-speed train model scaled at 1/8th at zero yaw, compared with gap spacing of 0 mm, the gap spacings lead to a significant reduction in the aerodynamic drag of the head car and an increase in that of the tail car, whereas which of the middle car is not significant. The maximum difference of the drag coefficient of the entire train model is smaller than 2.0%. When the gap spacing does not exceed 8 mm, the discrepancies of the drag coefficients of three cars are within 6.15%.
AB - A certain gap spacing between adjacent vehicles is usually inevitable in wind tunnel force tests of high-speed trains under no crosswind, which may affect the wind tunnel test results. Thus, to understand the influence of gap spacings on the train aerodynamics, the aerodynamic drag, pressure distributions and airflow structures of 1/8th-scale high-speed train models with gap spacings of 0, 5, 8, 10, 20, and 30 mm were studied using RANS based on SST k-ω turbulence model. The simulation method was verified by the wind tunnel experiment data. The results show that the gap spacing significantly affects the airflow structure around inter-car gap and aerodynamic resistances of train models. For the high-speed train model scaled at 1/8th at zero yaw, compared with gap spacing of 0 mm, the gap spacings lead to a significant reduction in the aerodynamic drag of the head car and an increase in that of the tail car, whereas which of the middle car is not significant. The maximum difference of the drag coefficient of the entire train model is smaller than 2.0%. When the gap spacing does not exceed 8 mm, the discrepancies of the drag coefficients of three cars are within 6.15%.
KW - aerodynamic drag
KW - boundary layer
KW - gap spacing
KW - High-speed train
KW - pressure distribution
KW - RANS
UR - http://www.scopus.com/inward/record.url?scp=85087480556&partnerID=8YFLogxK
U2 - 10.1080/19942060.2020.1773319
DO - 10.1080/19942060.2020.1773319
M3 - Journal article
AN - SCOPUS:85087480556
SN - 1994-2060
VL - 14
SP - 835
EP - 852
JO - Engineering Applications of Computational Fluid Mechanics
JF - Engineering Applications of Computational Fluid Mechanics
IS - 1
ER -