IMECH-IR  > 流固耦合系统力学重点实验室
Numerical Investigation on the Influence of the Streamlined Structures of the High-Speed Train's Nose on Aerodynamic Performances
Sun ZX(孙振旭)1; Yao SB(姚拴宝)2; Wei LY(魏涟漪)1; Yao YF(姚永芳)1; Yang GW(杨国伟)1
Source PublicationAPPLIED SCIENCES-BASEL
2021
Volume11Issue:2Pages:22
Abstract

The structural design of the streamlined shape is the basis for high-speed train aerodynamic design. With use of the delayed detached-eddy simulation (DDES) method, the influence of four different structural types of the streamlined shape on aerodynamic performance and flow mechanism was investigated. These four designs were chosen elaborately, including a double-arch ellipsoid shape, a single-arch ellipsoid shape, a spindle shape with a front cowcatcher and a double-arch wide-flat shape. Two different running scenes, trains running in the open air or in crosswind conditions, were considered. Results reveal that when dealing with drag reduction of the whole train running in the open air, it needs to take into account how air resistance is distributed on both noses and then deal with them both rather than adjust only the head or the tail. An asymmetrical design is feasible with the head being a single-arch ellipsoid and the tail being a spindle with a front cowcatcher to achieve the minimum drag reduction. The single-arch ellipsoid design on both noses could aid in moderating the transverse amplitude of the side force on the tail resulting from the asymmetrical vortex structures in the flow field behind the tail. When crosswind is considered, the pressure distribution on the train surface becomes more disturbed, resulting in the increase of the side force and lift. The current study reveals that the double-arch wide-flat streamlined design helps to alleviate the side force and lift on both noses. The magnitude of side force on the head is 10 times as large as that on the tail while the lift on the head is slightly above that on the tail. Change of positions where flow separation takes place on the streamlined part is the main cause that leads to the opposite behaviors of pressure distribution on the head and on the tail. Under the influence of the ambient wind, flow separation occurs about distinct positions on the train surface and intricate vortices are generated at the leeward side, which add to the aerodynamic loads on the train in crosswind conditions. These results could help gain insight on choosing a most suitable streamlined shape under specific running conditions and acquiring a universal optimum nose shape as well.

DOI10.3390/app11020784
Indexed BySCI
Language英语
WOS IDWOS:000611042400001
Classification二类
Ranking1
ContributorSun, Zhenxu
Citation statistics
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/86144
Collection流固耦合系统力学重点实验室
Affiliation1.Chinese Acad Sci, Inst Mech, Key Lab Mech Fluid Solid Coupling Syst, Beijing 100190, Peoples R China;
2.CRRC Qingdao Sifang Co Ltd, Qingdao 266111, Peoples R China
Recommended Citation
GB/T 7714
Sun ZX,Yao SB,Wei LY,et al. Numerical Investigation on the Influence of the Streamlined Structures of the High-Speed Train's Nose on Aerodynamic Performances[J]. APPLIED SCIENCES-BASEL,2021,11(2):22.
APA Sun ZX,Yao SB,Wei LY,Yao YF,&Yang GW.(2021).Numerical Investigation on the Influence of the Streamlined Structures of the High-Speed Train's Nose on Aerodynamic Performances.APPLIED SCIENCES-BASEL,11(2),22.
MLA Sun ZX,et al."Numerical Investigation on the Influence of the Streamlined Structures of the High-Speed Train's Nose on Aerodynamic Performances".APPLIED SCIENCES-BASEL 11.2(2021):22.
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