Aerodynamic effects of the gap spacing between adjacent vehicles on wind tunnel train models
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 distrib...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Taylor & Francis Group
2020-01-01
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| Series: | Engineering Applications of Computational Fluid Mechanics |
| Subjects: | |
| Online Access: | http://dx.doi.org/10.1080/19942060.2020.1773319 |
| _version_ | 1818562263860117504 |
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| author | Yutao Xia Tanghong Liu Houyu Gu Zijian Guo Zhengwei Chen Wenhui Li Li Li |
| author_facet | Yutao Xia Tanghong Liu Houyu Gu Zijian Guo Zhengwei Chen Wenhui Li Li Li |
| author_sort | Yutao Xia |
| collection | DOAJ |
| description | 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%. |
| first_indexed | 2024-12-14T01:01:25Z |
| format | Article |
| id | doaj.art-275a6e2705e340ac957969d0669aff5e |
| institution | Directory Open Access Journal |
| issn | 1994-2060 1997-003X |
| language | English |
| last_indexed | 2024-12-14T01:01:25Z |
| publishDate | 2020-01-01 |
| publisher | Taylor & Francis Group |
| record_format | Article |
| series | Engineering Applications of Computational Fluid Mechanics |
| spelling | doaj.art-275a6e2705e340ac957969d0669aff5e2022-12-21T23:23:14ZengTaylor & Francis GroupEngineering Applications of Computational Fluid Mechanics1994-20601997-003X2020-01-0114183585210.1080/19942060.2020.17733191773319Aerodynamic effects of the gap spacing between adjacent vehicles on wind tunnel train modelsYutao Xia0Tanghong Liu1Houyu Gu2Zijian Guo3Zhengwei Chen4Wenhui Li5Li Li6Key Laboratory of Traffic Safety on Track of Ministry of Education, School of Traffic & Transportation Engineering, Central South UniversityKey Laboratory of Traffic Safety on Track of Ministry of Education, School of Traffic & Transportation Engineering, Central South UniversityKey Laboratory of Traffic Safety on Track of Ministry of Education, School of Traffic & Transportation Engineering, Central South UniversityKey Laboratory of Traffic Safety on Track of Ministry of Education, School of Traffic & Transportation Engineering, Central South UniversityKey Laboratory of Traffic Safety on Track of Ministry of Education, School of Traffic & Transportation Engineering, Central South UniversityKey Laboratory of Traffic Safety on Track of Ministry of Education, School of Traffic & Transportation Engineering, Central South UniversityKey Laboratory of Traffic Safety on Track of Ministry of Education, School of Traffic & Transportation Engineering, Central South UniversityA 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%.http://dx.doi.org/10.1080/19942060.2020.1773319high-speed trainaerodynamic draggap spacingranspressure distributionboundary layer |
| spellingShingle | Yutao Xia Tanghong Liu Houyu Gu Zijian Guo Zhengwei Chen Wenhui Li Li Li Aerodynamic effects of the gap spacing between adjacent vehicles on wind tunnel train models Engineering Applications of Computational Fluid Mechanics high-speed train aerodynamic drag gap spacing rans pressure distribution boundary layer |
| title | Aerodynamic effects of the gap spacing between adjacent vehicles on wind tunnel train models |
| title_full | Aerodynamic effects of the gap spacing between adjacent vehicles on wind tunnel train models |
| title_fullStr | Aerodynamic effects of the gap spacing between adjacent vehicles on wind tunnel train models |
| title_full_unstemmed | Aerodynamic effects of the gap spacing between adjacent vehicles on wind tunnel train models |
| title_short | Aerodynamic effects of the gap spacing between adjacent vehicles on wind tunnel train models |
| title_sort | aerodynamic effects of the gap spacing between adjacent vehicles on wind tunnel train models |
| topic | high-speed train aerodynamic drag gap spacing rans pressure distribution boundary layer |
| url | http://dx.doi.org/10.1080/19942060.2020.1773319 |
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