摘要
介绍了高压氢气泄漏自燃的研究现状,对基于扩散点火机理的高压氢气泄漏自燃的研究方法、手段及主要成果进行了初步分析。指出目前对于该机理的研究主要借助于管道内高压氢气突然扩散传播与喷射时的自燃现象进行分析。从初始压力和温度、管道几何尺寸和管口形状等方面讨论了引发这种自燃现象的主导因素及各因素的相互关系,并对实验和计算机模拟的研究方法和结果进行了讨论。最后对高压氢气泄漏自燃的研究进行了展望,可以针对更为复杂的工况进行研究,系统全面地分析各类因素的影响及其相互关系。
The authors of this paper cherish their intention to briefly review the up-to-date advances on the research about serf-ignition of high-pressure hydrogen leaks with their rudimentarily analysis over the methods, measures and achievements of the investigation of diffusion ignition mechanisms. Compressed hydrogen is one of the main options in processing the storage, transportation and application of hydrogen. Hydrogen has a greater propensity to leak than other gaseous fuel. As a result, the potential fire and explosion hazards in the event of any accidental release would be a great barrier to the wide use of compressed hydrogen tank and pipe. In addition, hydrogen tends to serfignite, which makes us see the need of experimental and numerical demonstration of the diffusion ignition as one of the ignition mechanisms. It is also necessary to point out that most of the current researches are devoted to the spontaneous ignition of pressurized hydrogen jet through a tube or nozzle into air. The main parameters that lead to the spontaneous ignition are the initial pressure, local temperature, downstream geometry of tube and nozzle shape, etc., which also requires us to mention some numerical and experimental methods that are useful to study the above mentioned parameters to reduce unexpected accidents. A lot of experimental investigations has been carried out by the present authors with some achievements obtained. For example, the present study suggests that the probability of serf-ignition tends to increase with the increase of the initial pressure of the tube length, initial temperature and area of cress sections. Inability to do enough experiments has also made us feel the need to do numerical simulations to investigate the micro structure of the fluid field and parameters that were beyond be experimental tests. Therefore, the research prospect in the future will be shifted into the diffusion ignition mechanism. In addition, more work would be turned to explore more complicated conditions in order to identify the main
出处
《安全与环境学报》
CAS
CSCD
北大核心
2009年第4期125-129,共5页
Journal of Safety and Environment
关键词
安全技术及工程
高压氢气
泄漏
自燃
激波
safety technology and engineering
high-pressure hydro- gen
leak
autoignition
shock wave
