First experimental data of the cryogenic safety test facility PICARD

26th International Cryogenic Engineering Conference & International Cryogenic Materials Conference 2016

材料科学;物理学

Heidt, C.^1,2 ; Henriques, A.^3 ; Stamm, M.^1 ; Grohmann, S.^1,2

Karlsruhe Institute of Technology, Institute for Technical Physics, Hermann-von-Helmholtz-Platz 1, Eggenstein-Leopoldshafen

76344, Germany^1

Karlsruhe Institute of Technology, Institute for Technical Thermodynamics and Refrigeration, Kaiserstrasse 12, Karlsruhe

76131, Germany^2

European Organization for Nuclear Research (CERN), Geneva 23

CH-1211, Switzerland^3

关键词: Cryogenic fluids;    Cryogenic temperatures;    Flow coefficients;    Insulating vacuum;    Liquid helium;    Liquid helium temperature;    Pressure increase;    Realistic conditions;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/171/1/012044/pdf
DOI  :  10.1088/1757-899X/171/1/012044

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The test facility PICARD, which stands for Pressure Increase in Cryostats and Analysis of Relief Devices, has been designed and constructed for cryogenic safety experiments. With a cryogenic liquid volume of 100 L, a nominal design pressure of 16 bar(g) and the capacity of measuring helium mass flow rates through safety relief devices up to 4 kg/s, the test facility allows the systematic investigation of hazardous incidents in cryostats under realistic conditions. In the course of experiments, the insulating vacuum is vented with atmospheric air or gaseous nitrogen at ambient temperature under variation of the venting diameter, the thermal insulation, the cryogenic fluid, the liquid level and the set pressure in order to analyze the impact on the heat flux and hence on the process dynamics. A special focus will be on the occurrence and implications of two-phase flow during expansion and on measuring the flow coefficients of safety devices at cryogenic temperatures. This paper describes the commissioning and the general performance of the test facility at liquid helium temperatures. Furthermore, the results of first venting experiments are presented.