摘要
高压氢气泄漏自燃直接威胁到储氢的安全,为了寻求安全的储氢方式,亟需获得高压氢气泄漏自燃的基本规律。以管内高压氢气为研究对象,通过数值模拟的手段研究了不同冲破压力和管径下氢气泄漏自燃的过程;基于详细动力学分析,得到了引起自燃着火的关键反应路径。研究结果表明,冲破压力的大小直接影响着火的难易程度及着火的位置,冲破压力增大,反应路径H-H02-OH得到明显增强,促进着火;随着管径逐渐减小,激波耗散增大,近壁区逐渐不易着火,直至气流前端出现旋涡,在管道中心形成高温区引发着火.相应基元反应的抑制手段和合理的压力释放方案以及管径控制是预防氢气高压泄漏自燃的关键,本文工作将为寻求安全的储氢手段提供理论依据.
The safety of hydrogen storage is directly threatened by the spontaneous ignition of high pressure hydrogen release,so that the basic understanding of high pressure hydrogen release sponta- neous ignition is desperately needed.The process of hydrogen spontaneous ignition under different release pressures and tube diameters was studied by numerical simulation.Based on the detailed kinetic mechanism,the reaction paths that cause spontaneous ignition were obtained.The results show that the release pressure has a direct impact on the appearance and the location of the flame. With the increase of release pressure,the reaction path of H-HO2-OH is enhanced,which promotes the ignition process.With the decrease of the diameter of the tube,the shock wave dissipation increases,and becomes gradually difficult for ignition near the wall area.As a consequence,it will not ignition until the formation of vortex in front of the flow,which leads to a high temperature region in the center of the tube.The suppression of the corresponding elementary reaction,the reasonable pressure release pattern and tube diameter are the keys to prevent spontaneous ignition of high pressure hydrogen leakage.This work will provide a theoretical basis for seeking safe hydrogen storage.
作者
卓小芳
王子君
禹进
苟小龙
ZHUO Xiao-Fang;WANG Zi-Jun;YU Jin;GOU Xiao-Long(College of power engineering,Chongqing University,Chongqing 400044,China)
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2018年第12期2799-2803,共5页
Journal of Engineering Thermophysics
基金
国家自然科学基金资助项目(No.51776023)
关键词
高压氢气
数值模拟
泄漏自燃
着火分析
pressurized hydrogen
numerical simulation
spontaneous ignition
kinetic mechanism
