Hydrogen has attracted much attention from governments and enterprises around the world due to its zero pollution and recycling use. However, it may bring safety problems such as hydrogen jet fire due to its wide flammability range and low ignition energy. Therefore, the methods of preventing hydrogen jet fire need to be explored urgently. In order to investigate the effect of gaseous fire extinguishing agent on the hydrogen jet fire, a series of experiments were carried out to study the flame behaviors under the effects of nitrogen and carbon dioxide jets. The fire extinguishing agents were released through a jet nozzle with diameter of 3 mm at the pressure of 11 atm. The flame length, thermal radiant flux and total heat flux were analyzed. The results show that the reduction ratio of vertical flame length increases with the decrease of the installation height of the extinguishing agent nozzle. It indicates that when the fire extinguishing agent is injected at the root of hydrogen jet flame, the fire may be extinguished. Due to the reduction of flame size, the thermal radiant flux received by the radiometer decreases, which corresponds to the reduction of flame radiation fraction. The total heat flux received in the downstream region of deflected flame is determined by the joint action of thermal radiation and convection. The convective heat transfer of high-temperature gas may cause the value measured by the heat flux meter on the flow path of the deflected flame to increase. Besides, the extinguishing limit for hydrogen jet flame under the effects of nitrogen and carbon dioxide jets are analyzed.

氢气因其零污染和可循环利用的特点，备受世界各国政府和企业的关注。但由于其可燃范围广，点火能量低，可能会带来氢气喷射火灾等安全问题。因此，迫切需要探索防止氢气喷射火灾的方法。为了研究气体灭火剂对氢气射流火灾的影响，开展了一系列实验研究了氮气和二氧化碳射流作用下的火焰行为。灭火剂通过喷嘴释放直径为 3 毫米，压力为 11 个大气压。对火焰长度、热辐射通量和总热通量进行了分析。结果表明，随着灭火剂喷嘴安装高度的减小，垂直火焰长度的减小率增大。表示在氢气喷射火焰的根部注入灭火剂后，火灾可能会被扑灭。由于火焰尺寸的减小，辐射计接收的热辐射通量减少，这对应于火焰辐射分数的减少。偏转火焰下游区域接收的总热通量由热辐射和对流的共同作用决定。这高温气体的对流传热可能导致偏转火焰流道上的热通量计测得的值增大。此外，分析了氮气和二氧化碳射流作用下氢气射流火焰的熄灭极限。