Experiment and simulation were conducted to study the development process of jet fire and explosion induced by the high-pressure hydrogen spontaneous ignition. The pressurized hydrogen was released under different tube length and release pressure in the experiment. The overpressure generated by the leading shock and the light signal of the flame with different conditions were recorded. The propagation of the external jet flame was captured by a high-speed camera. Different parameters including velocity, temperature, and concentration distribution were analyzed based on the simulated results. It is revealed that the jet fire and explosion, which are induced by hydrogen self-ignition, must go through a series of specific stages of development, and this process has no significant correlation with pipe length and release pressure. This process consists of several stages, including the formation of the combustion zone downstream of the Mach disk; the flame chases the top of the jet along the shear layer; the flow velocity at the top of the jet decreases causing the ring vortex to disappear and the combustible gas to accumulate; the shear layer flame propagates to the top of the jet causing the explosion. Besides, the explosion will inevitably occur along with the jet fire, which is caused by the spontaneous ignition induced by the sudden release of high-pressure hydrogen and is developed in the open space.

通过实验和仿真研究高压氢自燃引起的喷射火和爆炸的发展过程。在实验中，加压氢气在不同的管长和释放压力下释放。记录在不同条件下由超前冲击产生的超压和火焰的光信号。外部喷射火焰的传播是由高速相机捕获的。根据模拟结果分析了不同的参数，包括速度，温度和浓度分布。揭示了由氢自燃引起的喷射火和爆炸必须经历一系列特定的发展阶段，并且该过程与管道长度和释放压力没有显着相关性。该过程包括几个阶段，包括在马赫盘下游形成燃烧区。火焰沿着剪切层追赶射流的顶部；射流顶部的流速降低，导致环涡消失，可燃气体积聚；剪切层火焰传播到射流的顶部，引起爆炸。此外，爆炸会不可避免地与喷射火一起发生，这是由于高压氢气突然释放引起的自燃而引起的，并在空旷的空间中展开。射流顶部的流速降低，导致环涡消失，可燃气体积聚；剪切层火焰传播到射流的顶部，引起爆炸。此外，爆炸会不可避免地与喷射火一起发生，这是由于高压氢气突然释放引起的自燃而引起的，并在空旷的空间中展开。射流顶部的流速降低，导致环涡消失，可燃气体积聚；剪切层火焰传播到射流的顶部，引起爆炸。此外，爆炸会不可避免地与喷射火一起发生，这是由于高压氢气突然释放引起的自燃而引起的，并在空旷的空间中展开。