Cavity effects on spontaneous ignition of pressurized hydrogen jets

Zhang，Jiaxin1; Huang，Jiaming2; Ba，Qingxin3,4,6; Zhou，Bo2; Christopher，David M.5; Gao，Ming6; Li，Xuefang1,4,6

2024-03-01

10.1016/j.fuel.2023.130495

Fuel   影响因子和分区

0016-2361

The release of pressurized hydrogen jets can lead to spontaneous ignition, which poses a major challenge to the safe utilization of hydrogen energy. Previous studies have primarily focused on the spontaneous ignition of pressurized hydrogen released into tubes. However, in real industrial scenarios, pressurized hydrogen is usually released into the atmosphere or a complex equipment environment. Therefore, the effect of obstacles on spontaneous ignition needs to be considered. In this study, the spontaneous ignition of sudden releases of pressurized hydrogen entering various cavity shapes was modeled using the standard k-ω turbulence model, the eddy dissipation concept (EDC) model and a detailed 21-step chemistry model. The effects of the cavities on the jet flow fields and the spontaneous ignition were analyzed for various cavity shapes and release pressures. For the pressures considered in this study, the cylindrical cavity did not lead to ignition. The highest hydrogen jet temperature occurred in the contact region due to the shock wave reflection, after which spontaneous ignition could not occur due to the flow divergence. The pressurized hydrogen entering hemispherical and conical cavities enhanced the hydrogen-air mixing which led to combustible regions and the formation of multidimensional shock waves, which significantly increased the spontaneous ignition probability. The cavities created a high-temperature region inside the cavity that experienced ignition but the flames did not spread out of the cavity. The conical cavity produced lower flame temperatures than the hemispherical cavity but prolonged the flame lifetime. Higher initial hydrogen release pressures resulted in more violent multidimensional shock wave interactions and higher contact surface temperatures, which lead to earlier ignition times but with little impact on the initial location of the spontaneous ignition. The results of this study provide a scientific foundation for hydrogen safety codes, safe equipment designs and the development of industry codes and standards.

Cavities Hydrogen jet Hydrogen safety Spontaneous ignition

SCI ; EI

英语

其他

ENGINEERING

2-s2.0-85178147556

Scopus

1.Institute of Thermal Science and Technology (Institute for Advanced Technology),Shandong University,Jinan,250061,China
2.Department of Mechanics and Aerospace Engineering,Southern University of Science and Technology,Shenzhen,518055,China
3.School of Mechanical Engineering,Shandong University,Jinan,250061,China
4.Centre for Hydrogen Energy,Shandong University,Jinan,250061,China
5.Key Laboratory of Thermal Science and Power Engineering of Ministry of Education,Tsinghua University,Beijing,100084,China
6.Shandong Engineering Research Center for High-efficiency Energy Storage and Hydrogen Energy Utilization,School of Energy and Power Engineering,Shandong University,Jinan,250061,China

Zhang，Jiaxin,Huang，Jiaming,Ba，Qingxin,et al. Cavity effects on spontaneous ignition of pressurized hydrogen jets[J]. Fuel,2024,359.

Zhang，Jiaxin.,Huang，Jiaming.,Ba，Qingxin.,Zhou，Bo.,Christopher，David M..,...&Li，Xuefang.(2024).Cavity effects on spontaneous ignition of pressurized hydrogen jets.Fuel,359.

Zhang，Jiaxin,et al."Cavity effects on spontaneous ignition of pressurized hydrogen jets".Fuel 359(2024).