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传热学

DOI: 10.1615/HeatTransRes.2012004228
pages 523-538

Experimental Investigation of Thermal Response on High-Vacuum-Multilayer-Insulation (HVMLI) Cryogenic Tank after Sudden, Catastrophic Loss of Insulation Vacuum (SCLIV)

Ming Zhu
Department of Mechanics & Power, Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, No. 800,Dongchuan Road, Shanghai 200240, PR China
C. Ding
Department of Mechanics & Power, Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, No. 800,Dongchuan Road, Shanghai 200240, PR China
R. S. Wang
Department of Mechanics & Power, Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, No. 800,Dongchuan Road, Shanghai 200240, PR China

ABSTRACT

This paper was to experimentally investigate the thermal response of high-vacuum-multilayer-insulation (HVMLI) cryogenic tank after sudden, catastrophic loss of insulation vacuum (SCLIV). The venting and no-venting experiments were conducted with the breakdown of the insulating vacuum with nitrogen. There was a great temperature gradient in the thickness direction of the MLI in both the venting and no-venting experiments. Temperature jump appeared on the external wall of the inner vessel after gas was introduced into the insulation vacuum jacket. Thermal stratification in liquid nitrogen (LN2) was serious with 25 K axial temperature difference in the no-venting experiment. The no-venting experiment included four stages. The fourth stage was the most dangerous and must be strictly avoided because the pressure of the tank full of superheated LN2 could surpass the safety pressure in a few minutes and the tank could blast at any moment.