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中南大学学报(英文版)

Journal of Central South University

Vol. 27    No. 1    January 2020

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Numerical simulatim of rainwater accumulation and flow characteristics over windshield of high-speed trains
DU Jian(杜健)1, 2, LIANG Xi-feng(梁习锋)1, 3, LI Gui-bo(李桂波)2, TIAN Hong-lei(田洪雷)2, YANG Ming-zhi(杨明智)1

1. Key Laboratory of Traffic Safety on Track of the Ministry of Education, Changsha 410075, China;
2. China Railway Rolling Stock Corporation Qingdao Sifang Co., Ltd., Qingdao 266111, China;
3. National & Local Joint Engineering Research Center of Safety Technology for Rail Vehicle,Changsha 410075, China

Abstract:In this paper, a Euler-Lagrangian particle/fluid film/VOF coupled multiphase flow model is presented. Numerical simulations are conducted, and the rainwater accumulation and flow characteristics over two types of windshields are studied based on the presented model. The results show that an uneven water film is formed over the windshield, with rain water accumulation occurring for the concave windshield but not for the convex windshield. At low speeds, the average fluid-film thickness for a concave windshield is larger than that of a convex windshield; however, a minor difference occurs between these two values at high speeds, and a critical velocity is observed for the two types of windshields. When the train velocity is less than the critical velocity, the fluid film at the lower part of the windshield and the train nose flows downward, and beyond the critical velocity, the fluid film over the entire windshield and train nose flows upward.

 

Key words: high-speed train; windshield; rainwater accumulation; aerodynamic characteristics

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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