首页 | 本学科首页   官方微博 | 高级检索  
     


Physics of spontaneous ignition of high-pressure hydrogen release and transition to jet fire
Authors:MV Bragin  VV Molkov
Affiliation:HySAFER Centre, University of Ulster, Shore Road, Newtownabbey BT37 0QB, UK
Abstract:The aim of this study is to gain an insight into the physical phenomena underlying the spontaneous ignition of hydrogen following a sudden release from high-pressure storage and transition to sustained jet fire. The modelling and large-eddy simulation (LES) of the spontaneous ignition dynamics in a tube with a non-inertial rupture disk separating the high-pressure hydrogen storage and the atmosphere is described. Numerical experiments confirmed that due to the stagnation conditions a chemical reaction first commences in the tube boundary layer, and subsequently propagates throughout the tube cross-section. The dynamics of flame formation outside the tube, simulated by the LES model, has reproduced the combustion patterns, including vortex induced “flame separation”, which have been experimentally observed by high-speed photography. It is concluded that the LES model can be applied for hydrogen safety engineering, e.g. for the development of innovative pressure relief devices.
Keywords:Spontaneous ignition  High-pressure release  Hydrogen  Large-eddy simulation  Boundary layer  Validation
本文献已被 ScienceDirect 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号