Journal article
Numerical investigation of flow deflectors for the improvement of condensing air flux through the air-conditioning unit on high-speed trains
Building and environment, v 215, p108949
01 May 2022
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
It has been observed that the condensing air flux through the air-conditioning (AC) unit on a running high-speed train significantly decreases due to the shear stream flowing over the train roof. Insufficient condensing air may put the AC under a risk of overheating. In this study, four shapes of flow deflectors that are able to alleviate the flux drop are designed and investigated using experimentally validated Delayed Detached Eddy Simulation (DDES). Numerical results show that the air flux drop mainly depends on the cross-sectional shape of deflectors, which changes the flow conditions above AC condensing outlets, including the properties of the negative pressure region and the incident angle of the high-speed shear flow produced by the train operation. Meanwhile, the extra aerodynamic drag brought by the installation of deflectors is computed and analyzed. The results presented in this paper can be applied to the design of the AC system, as well as other equipment requiring active convective cooling, on higher speed trains.
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Details
- Title
- Numerical investigation of flow deflectors for the improvement of condensing air flux through the air-conditioning unit on high-speed trains
- Creators
- Xueliang Li - EY TechnologiesFan Wu - EY TechnologiesYu Tao - National & Local Joint Engineering Research Center of Safety Technology for Rail Vehicle, Changsha, 410075, Hunan, ChinaMingzhi Yang - National & Local Joint Engineering Research Center of Safety Technology for Rail Vehicle, Changsha, 410075, Hunan, ChinaRenze Xu - National & Local Joint Engineering Research Center of Safety Technology for Rail Vehicle, Changsha, 410075, Hunan, ChinaDmitri Vainchtein - Drexel University
- Publication Details
- Building and environment, v 215, p108949
- Publisher
- Elsevier
- Number of pages
- 14
- Grant note
- 52072413 / National Science Foundation of China; National Natural Science Foundation of China (NSFC) K2020J003 / China National Railway Group Limited
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- C. and J. Nyheim Plasma Institute
- Web of Science ID
- WOS:000774217000002
- Scopus ID
- 2-s2.0-85126147315
- Other Identifier
- 991019169539504721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Construction & Building Technology
- Engineering, Civil
- Engineering, Environmental