| Numerical study on wake characteristics of high-speed trains | |
Yao SB(姚拴宝) ; Sun ZX(孙振旭); Guo DL(郭迪龙); Chen DW(陈大伟); Yang GW(杨国伟); Guo, DL (reprint author), Chinese Acad Sci, Inst Mech, Key Lab Mech Fluid Solid Coupling Syst, Beijing 100190, Peoples R China.
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| Source Publication | Acta Mechanica Sinica
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| 2013-12-25 | |
| Volume | 29Issue:6Pages:811-822 |
| ISSN | 0567-7718 |
| Abstract | Intensive turbulence exists in the wakes of high speed trains, and the aerodynamic performance of the trailing car could deteriorate rapidly due to complicated features of the vortices in the wake zone. As a result, the safety and amenity of high speed trains would face a great challenge. This paper considers mainly the mechanism of vortex formation and evolution in the train flow field. A real CRH2 model is studied, with a leading car, a middle car and a trailing car included. Different running speeds and cross wind conditions are considered, and the approaches of unsteady Reynold-averaged Navier-Stokes (URANS) and detached eddy simulation (DES) are utilized, respectively. Results reveal that DES has better capability of capturing small eddies compared to URANS. However, for large eddies, the effects of two approaches are almost the same. In conditions without cross winds, two large vortex streets stretch from the train nose and interact strongly with each other in the wake zone. With the reinforcement of the ground, a complicated wake vortex system generates and becomes strengthened as the running speed increases. However, the locations of flow separations on the train surface and the separation mechanism keep unchanged. In conditions with cross winds, three large vortices develop along the leeward side of the train, among which the weakest one has no obvious influence on the wake flow while the other two stretch to the tail of the train and combine with the helical vortices in the train wake. Thus, optimization of the aerodynamic performance of the trailing car should be aiming at reducing the intensity of the wake vortex system. |
| Keyword | Wake Flow Structures Urans Des High Speed Trains |
| Subject Area | 工业空气动力学 |
| URL | 查看原文 |
| Indexed By | SCI ; EI ; CSCD |
| Language | 英语 |
| WOS ID | WOS:000328853100007 |
| Funding Organization | National Key Technology RD Program [2009BAG12A03]; Major State Basic Research Development Program of China [2011CB711101] |
| Department | LMFS流固耦合与数值计算(LHO) |
| Classification | 二类 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/47725 |
| Collection | 流固耦合系统力学重点实验室 |
| Corresponding Author | Guo, DL (reprint author), Chinese Acad Sci, Inst Mech, Key Lab Mech Fluid Solid Coupling Syst, Beijing 100190, Peoples R China. |
| Recommended Citation GB/T 7714 | Yao SB,Sun ZX,Guo DL,et al. Numerical study on wake characteristics of high-speed trains[J]. Acta Mechanica Sinica,2013,29,6,:811-822. |
| APA | Yao SB,Sun ZX,Guo DL,Chen DW,Yang GW,&Guo, DL .(2013).Numerical study on wake characteristics of high-speed trains.Acta Mechanica Sinica,29(6),811-822. |
| MLA | Yao SB,et al."Numerical study on wake characteristics of high-speed trains".Acta Mechanica Sinica 29.6(2013):811-822. |
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