Speaker
Description
Helium cryogenic system has been widely used in large-scale scientific engineering fields utilizing superconducting technology, such as nuclear fusion, high-energy accelerator, and high-energy particle detector. Once suffering from vacuum insulation failure, magnet quenching, material defect, mechanical fatigue, external impact, electrical joint failure, etc., the protective devices and key components of helium cryogenic system could rupture and fail. The cryogenic helium will then leak into surrounding environment, posing severe threat to the safety of personnel, equipment, and building. Previous studies mainly evaluated the potential hazards of extremely low temperature, hypoxia, and overpressure induced by the accidental leakage of cryogenic helium into confined space from macroscopic perspective, while rarely focused on the dispersion characteristics of cryogenic helium vapor cloud in confined space. In the present work, CFD numerical model predicting the leakage and dispersion of cryogenic helium in confined space is developed firstly. Then, the spread and evolution laws of cryogenic helium cloud, the helium concentration distribution characteristics, and the cloud turbulent disturbance characteristics are investigated from microscopic perspective. The work provides guidance for the prediction and safe protection of the leakage and dispersion of cryogenic helium in confined space, which helps to improve the safety of helium cryogenic system further.
| Submitters Country | China |
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