Numerical Investigation of the Effects of Sand Collision on the Aerodynamic Behaviour of a High-Speed Train Subjected to Yaw Angles
In this paper, the aerodynamic performance of the head car of a CRH2 train running in sandstorms was investigated. A numerical simulation method based on Realizable k-ε turbulence model was used to explore the flow features around the high-speed train. The accuracy of mesh resolution and methodology...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Isfahan University of Technology
2019-01-01
|
| Series: | Journal of Applied Fluid Mechanics |
| Subjects: | |
| Online Access: | http://jafmonline.net/JournalArchive/download?file_ID=48401&issue_ID=254 |
| _version_ | 1818211113268936704 |
|---|---|
| author | J. Wang D. Liu G. Gao Y. Zhang Jie Zhang |
| author_facet | J. Wang D. Liu G. Gao Y. Zhang Jie Zhang |
| author_sort | J. Wang |
| collection | DOAJ |
| description | In this paper, the aerodynamic performance of the head car of a CRH2 train running in sandstorms was investigated. A numerical simulation method based on Realizable k-ε turbulence model was used to explore the flow features around the high-speed train. The accuracy of mesh resolution and methodology of CFD was validated by wind tunnel tests. A discrete phase model (DPM) was adopted to investigate the effects of sand particle properties (diameter and restitution coefficient) on the aerodynamic performance of the head car. Yaw angle effects with the sand-laden flow on the aerodynamic coefficient were also discussed. The results show that the drag force, lift force, lateral force, and overturning moment of the head car increase significantly due to the sand, and the sand particle properties have dominant effects on the aerodynamic performance of the head car. The impact probability of sand particles on the vehicle increases with the sand particle diameter and the yaw angle increasing. Larger restitution coefficients lead to lager forces of the head car, resulting in more contribution to the aerodynamic coefficients. Owing to the sand collision, a larger yaw angle causes more contribution to the aerodynamic performance of the head car, and the influence of sand properties on the drag force, lateral force and overturning moment are enhanced with the increase of the yaw angle. Using appropriate coatings around the high-speed train can not only reduce the energy consumption, but also improve the lateral stability and the critical operational speed of the high-speed train in the sandstorms. |
| first_indexed | 2024-12-12T05:27:20Z |
| format | Article |
| id | doaj.art-fbc110230eaf477dab41a15417bdd0da |
| institution | Directory Open Access Journal |
| issn | 1735-3572 |
| language | English |
| last_indexed | 2024-12-12T05:27:20Z |
| publishDate | 2019-01-01 |
| publisher | Isfahan University of Technology |
| record_format | Article |
| series | Journal of Applied Fluid Mechanics |
| spelling | doaj.art-fbc110230eaf477dab41a15417bdd0da2022-12-22T00:36:25ZengIsfahan University of TechnologyJournal of Applied Fluid Mechanics1735-35722019-01-01122379389.Numerical Investigation of the Effects of Sand Collision on the Aerodynamic Behaviour of a High-Speed Train Subjected to Yaw AnglesJ. Wang0D. Liu1G. Gao2Y. Zhang3Jie Zhang4Key Laboratory of Traffic Safety on Track of Ministry of Education, School of Traffic & Transportation Engineering, Central South University, Changsha 410075, ChinaKey Laboratory of Traffic Safety on Track of Ministry of Education, School of Traffic & Transportation Engineering, Central South University, Changsha 410075, ChinaKey Laboratory of Traffic Safety on Track of Ministry of Education, School of Traffic & Transportation Engineering, Central South University, Changsha 410075, ChinaKey Laboratory of Traffic Safety on Track of Ministry of Education, School of Traffic & Transportation Engineering, Central South University, Changsha 410075, ChinaKey Laboratory of Traffic Safety on Track of Ministry of Education, School of Traffic & TransportatiIn this paper, the aerodynamic performance of the head car of a CRH2 train running in sandstorms was investigated. A numerical simulation method based on Realizable k-ε turbulence model was used to explore the flow features around the high-speed train. The accuracy of mesh resolution and methodology of CFD was validated by wind tunnel tests. A discrete phase model (DPM) was adopted to investigate the effects of sand particle properties (diameter and restitution coefficient) on the aerodynamic performance of the head car. Yaw angle effects with the sand-laden flow on the aerodynamic coefficient were also discussed. The results show that the drag force, lift force, lateral force, and overturning moment of the head car increase significantly due to the sand, and the sand particle properties have dominant effects on the aerodynamic performance of the head car. The impact probability of sand particles on the vehicle increases with the sand particle diameter and the yaw angle increasing. Larger restitution coefficients lead to lager forces of the head car, resulting in more contribution to the aerodynamic coefficients. Owing to the sand collision, a larger yaw angle causes more contribution to the aerodynamic performance of the head car, and the influence of sand properties on the drag force, lateral force and overturning moment are enhanced with the increase of the yaw angle. Using appropriate coatings around the high-speed train can not only reduce the energy consumption, but also improve the lateral stability and the critical operational speed of the high-speed train in the sandstorms.http://jafmonline.net/JournalArchive/download?file_ID=48401&issue_ID=254High-speed train; Aerodynamic performance; Sand impact; Discrete phase model; Numerical simulation. |
| spellingShingle | J. Wang D. Liu G. Gao Y. Zhang Jie Zhang Numerical Investigation of the Effects of Sand Collision on the Aerodynamic Behaviour of a High-Speed Train Subjected to Yaw Angles Journal of Applied Fluid Mechanics High-speed train; Aerodynamic performance; Sand impact; Discrete phase model; Numerical simulation. |
| title | Numerical Investigation of the Effects of Sand Collision on the Aerodynamic Behaviour of a High-Speed Train Subjected to Yaw Angles |
| title_full | Numerical Investigation of the Effects of Sand Collision on the Aerodynamic Behaviour of a High-Speed Train Subjected to Yaw Angles |
| title_fullStr | Numerical Investigation of the Effects of Sand Collision on the Aerodynamic Behaviour of a High-Speed Train Subjected to Yaw Angles |
| title_full_unstemmed | Numerical Investigation of the Effects of Sand Collision on the Aerodynamic Behaviour of a High-Speed Train Subjected to Yaw Angles |
| title_short | Numerical Investigation of the Effects of Sand Collision on the Aerodynamic Behaviour of a High-Speed Train Subjected to Yaw Angles |
| title_sort | numerical investigation of the effects of sand collision on the aerodynamic behaviour of a high speed train subjected to yaw angles |
| topic | High-speed train; Aerodynamic performance; Sand impact; Discrete phase model; Numerical simulation. |
| url | http://jafmonline.net/JournalArchive/download?file_ID=48401&issue_ID=254 |
| work_keys_str_mv | AT jwang numericalinvestigationoftheeffectsofsandcollisionontheaerodynamicbehaviourofahighspeedtrainsubjectedtoyawangles AT dliu numericalinvestigationoftheeffectsofsandcollisionontheaerodynamicbehaviourofahighspeedtrainsubjectedtoyawangles AT ggao numericalinvestigationoftheeffectsofsandcollisionontheaerodynamicbehaviourofahighspeedtrainsubjectedtoyawangles AT yzhang numericalinvestigationoftheeffectsofsandcollisionontheaerodynamicbehaviourofahighspeedtrainsubjectedtoyawangles AT jiezhang numericalinvestigationoftheeffectsofsandcollisionontheaerodynamicbehaviourofahighspeedtrainsubjectedtoyawangles |