SEDL / STP / STP1395-EB / STP12498S

A Fluid Flow Analysis of the Gaseous Impact Test

Ducrocq, J
Research Scientist, Air Liquide Group, Centre de Recherche Claude-Delorme, Jouy-en-Josas,

Barthelemy, H
Material Manager, Air Liquide Group, Paris,

Roy, D
Centre de Technologie et d'Expertises, Air Liquide, Le Blanc Mesnil,

Pages: 16    Published: Jan 2000

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Abstract

The Gaseous Impact Test is simulated using fluid dynamics numerical models. Pressure overshoots observed at Centre de Technologies et d'Expertises are matched by one-dimensional computations. Peak temperatures are evaluated when including irreversible processes. Formation of a temperature gradient within the hot gas plug has been identified and an explanation is provided. The influence of geometrical design parameters is studied. Temperature history requires use of a two-dimensional model for it enables description of vortex-induced mixing as a consequence of the reflected shock bifurcation at the test tube end. A cellular structure is formed in the pressure field. Skin temperature of different wall materials has also been evaluated. Short versus long test tube effects are discussed.