Journal of Experiental Mechanicals

氮气射流抑制氢气喷射火的实验研究

Experimental study of the mitigation of nitrogen jets for hydrogen jet flames

Received:February 16, 2022 Revised:April 29, 2022

英文关键词:hydrogen safety hydrogen jet flame flame mitigation nitrogen jet

基金项目:国家自然科学基金(项目号：52171348)；中央高校基本科研业务费专项资金(项目号：PA2020GDGP0052)；安徽省重点研发计划项目(S202104b11020035)；兖矿集团2019年技术研发支持计划项目(编号：YKZB 2020-173)资助

Author Name	Affiliation
WU Yue	1.School of Civil Engineering, Hefei University of Technology, Hefei 230009, Anhui, China 2.Anhui International Joint Research Centeron Hydrogen Safety, Hefei 230009, Anhui, China
YU Xing	1.School of Civil Engineering, Hefei University of Technology, Hefei 230009, Anhui, China 2.Anhui International Joint Research Centeron Hydrogen Safety, Hefei 230009, Anhui, China
WANG Wei	Yanzhou Nengyuan Yulin Nenghua Co., Ltd., Yulin 719099, Shaanxi, China
WANG Zongcheng	1.School of Civil Engineering, Hefei University of Technology, Hefei 230009, Anhui, China 2.Anhui International Joint Research Centeron Hydrogen Safety, Hefei 230009, Anhui, China
ZHAO Yanqiu	1.School of Civil Engineering, Hefei University of Technology, Hefei 230009, Anhui, China 2.Anhui International Joint Research Centeron Hydrogen Safety, Hefei 230009, Anhui, China
WANG Changjian*	1.School of Civil Engineering, Hefei University of Technology, Hefei 230009, Anhui, China 2.Engineering Research Center of Safety Critical Industrial Measurement and Control Technology, Ministry of Education, Hefei 230009, Anhui, China
SHEN Zhihe	1.School of Civil Engineering, Hefei University of Technology, Hefei 230009, Anhui, China 2.Engineering Research Center of Safety Critical Industrial Measurement and Control Technology, Ministry of Education, Hefei 230009, Anhui, China
LI Bing	National Engineering Research Center of Coal Gasification and Coal-Based Advanced Materials, Jinan 250000, Shandong, China

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中文摘要:

为了探究抑制氢气喷射火的有效方法，并揭示氮气射流对氢气喷射火焰的影响规律，开展了一系列氮气作用下氢气喷射火实验。采用喷嘴直径为3mm、滞止压力为10atm的氮气射流，并改变氮气喷射高度和水平喷射距离，对氢气喷射火进行抑制。选择2种典型的氢喷射火，分别为喷嘴直径为3mm、滞止压力为0.1atm的过膨胀亚音速火焰和喷嘴直径为1mm、滞止压力为8atm的欠膨胀超音速火焰。实验结果表明，在氮气射流作用下火焰发生偏转，氢气喷射火长度衰减率随氮气喷射高度增大而减小。当氮气作用于火焰根部时，能有效地扑灭氢气喷射火。随氮气喷射距离增加，氢喷射火长度衰减率减小。另外，欠膨胀超音速氢气喷射火存在火焰抬升现象，氮气更易使喷射火熄灭，且在较大的水平喷射距离下仍能使火焰熄灭；过膨胀亚音速氢气喷射火由于抬升高度不明显，氮气射流灭火效果较差，仅能够在较小的水平喷射距离下使火焰熄灭。

英文摘要:

In order to explore an effective method to suppress hydrogen jet fires and to reveal the effects of nitrogen jets on hydrogen jet fires, a series of experiments were carried out for hydrogen jet fires under nitrogen jets. The nitrogen jet with a stagnation pressure of 10atm and nozzle diameter of 3mm were used to suppress the hydrogen jet fires at different vertical heights and horizontal distances. Two typical hydrogen jet flames were selected, an over-expanded subsonic flame with a nozzle diameter of 3mm and stagnation pressure of 0.1atm and an under-expanded supersonic flame with a nozzle diameter of 1mm and stagnation pressure of 8atm. The results show that the flame deflects due to the injection of the nitrogen jet. The reduction rate of hydrogen jet flame length decreases with the increase of vertical injection distance of nitrogen. When the nitrogen jet is injected at the root of the flame, it can extinguish the hydrogen jet flame more effectively. The reduction rate of hydrogen jet flame length decreases with the increase of horizontal injection distance of nitrogen. In addition, due to the lift-off phenomenon of under-expanded hydrogen jet fire, the jet flame is easier to be extinguished by a high-pressure nitrogen jet, and the nitrogen jet can extinguish the flame for a larger injection distance. On the contrary, the nitrogen jet cannot effectively extinguish the over-expanded subsonic hydrogen jet flame since the lift-off of the latter is not significant.

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