Abstract: The application prospect and risk of leakage are elaborated. The research status on gas diffusion characteristic and jet fire ignition and propagation behavior of cryogenic hydrogen release is reported. The methods and conclusions on gas diffusion and jet flame of cryogenic hydrogen release are summarized and analyzed. The methods include experimental investigation and numerical simulation. Most of the researches focus on the gas diffusion characteristic. The conditions and influencing factors of the ignition and propagation behavior of the jet flame are not yet fully understood. In the future, the prediction model of gas diffusion characteristic during cryogenic hydrogen release should be developed, and the mechanism and influencing factors of cryogenic hydrogen ignition and jet flame propagation behavior should be further studied to establish an effective prediction model on gas diffusion characteristic and jet flame propagation behavior of cryogenic hydrogen release.

Key words: hydrogen safety, cryogenic hydrogen, release, gas diffusion, jet fire