|Table of Contents|

Calculation and risk analysis of liquid hydrogen leakage and diffusion in launching site(PDF)

《火箭推进》[ISSN:1672-9374/CN:CN 61-1436/V]

Issue:
2018年04期
Page:
78-84
Research Field:
推进剂技术
Publishing date:

Info

Title:
Calculation and risk analysis of liquid hydrogen leakage and diffusion in launching site
Author(s):
DING Peng1;  2;  CHEN Wei1;  2;  REN Huizhong2;  ZHOU Yu2
1. State Key Laboratory of Technology in Space Cryogenic Propellants, Beijing 100028, China; 2. School of Energy, Soochow University, Suzhou 215006, China
Keywords:
liquid hydrogen leakage;  leakage diffusion;  leakage computation;  hazard analysis
PACS:
V553-34
DOI:
-
Abstract:
Liquid hydrogen leakage from storage tank in the launching site is a complicated problem, which involves the issues of mass transfer and heat transfer of liquid, energy conservation, mass conservation and component conservation in the leakage process. The effect of the leakage pressure, leakage hole size and leakage hole location on the leakage process is analyzed emphatically in this paper by means of the simplified leakage diffusion model of liquid hydrogen in the storage tank. According to the simulation, it was found that the leakage velocity increases with increase of the pressure at the leakage hole, but which is not related to the leakage hole size when the flow coefficient at the leakage hole remain constant. Complete evaporation distance and complete evaporate time are positively correlated with leakage pressure and leakage hole size. The multi energy method TNO, associated with phase changing formular,is employed to performed the risk assessment of hydrogen explosion. It is found that the higher the leakage pressure and the larger the leakage hole diameter are, the more amount of hydrogen leakage becomes, which may cause more significant hazard from the vapor cloud explosion, when the leaked vapor cloud volume is smaller than restrained volume.

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