The shock-wave mechanism of spontaneous ignition of hydrogen under conditions of sudden efflux from reservoir at high pressure
The shock-wave mechanism of spontaneous ignition of hydrogen under conditions of sudden efflux from reservoir at high pressure
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DOI：
10.1134/s0018151x07050148
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发表时间：
2007-10-01
期刊：
影响因子：
1
通讯作者：
Ivanov, M. F.
中科院分区：
文献类型：
--
作者：
Bazhenova, T. V.;Bragin, M. V.;Ivanov, M. F.
分析了在膨胀冷气流前空气中出现起动激波导致氢气自燃的条件。冲击波后的温度上升导致可燃气体与空气的混合物点燃，其形成在接触表面上。自燃的条件是混合物在高温下有足够的时间进行混合和着火。氢射流的自发点火的计算是基于一个模型，该模型考虑了粘性气体的气体动力学传输，氢的氧化动力学，多组分扩散，和热导率。压力的范围在储存器中确定，在储存器减压期间，在空气中形成的冲击波表现出足以点燃在压缩氢气的传播射流的前部后面的氢气-空气混合物的强度。分析结果给出了点火条件对贮氢器中氢气压力、出口尺寸以及氢气和空气初始温度的依赖关系。
Analysis is made of the conditions of spontaneous ignition of hydrogen as a result of emergence of a starting shock wave in air before an expanding cold flow of gas. The rise of temperature behind the shock wave causes ignition of the mixture of combustible gas with air, which forms on the contact surface. The condition for spontaneous ignition is the sufficient time of residence of mixture at high temperature for mixing and ignition. The calculations of spontaneous ignition of hydrogen jet are based on a model which takes into account the gasdynamic transport of viscous gas, the kinetics of oxidation of hydrogen, multicomponent diffusion, and thermal conductivity. The range of pressures is determined in a reservoir, during whose depressurization the shock wave forming in air exhibits intensity sufficient for igniting the hydrogen-air mixture behind the front of propagating jet of compressed hydrogen. Results of analysis are given of the dependence of conditions of ignition on the pressure of hydrogen in the reservoir, on the size of the outlet opening, and on the initial temperature of hydrogen and air.