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运用扩散点火理论对高压氢气泄漏到下游管道内的自燃点火情况进行了分析。利用激波管流动理论讨论了氢气射流前端激波加热区域的参数变化情况,分析了前沿激波强度、均匀区压力和温度与初始压力的关系,给出了高压氢气泄漏到下游管道后,预测前沿激波强度、均匀区压力和温度的数学方程,建立了判断高压氢气泄漏到下游管道内是否发生自燃点火的函数表达式。提出了理论点火临界压力的概念,计算发现氢气的理论点火临界压力明显低于其他几种常见的气体燃料。讨论了影响泄漏自燃发生的可能因素,结果可为预防高压储氢泄漏自燃提供科学依据。
The diffusion ignition theory was used to analyze the ignition of high pressure hydrogen gas leaking into the downstream pipe. Based on the shock tube flow theory, the variation of the front shock wave heating area of the hydrogen jet was discussed. The relationship between the front shock intensity, the uniform pressure and temperature and the initial pressure was analyzed. After the high pressure hydrogen leaked into the downstream pipe, Front shock intensity, uniform pressure and temperature of the mathematical equation to establish a high-pressure hydrogen leak to the downstream pipe ignition spontaneous combustion function formula. The concept of theoretical critical ignition pressure is proposed. The theoretical critical ignition pressure of hydrogen is obviously lower than that of several other common gaseous fuels. The possible factors that affect the occurrence of spontaneous combustion of the leaking were discussed. The results may provide a scientific basis for preventing spontaneous combustion of high pressure hydrogen storage leaking.