STP1395

    A Fluid Flow Analysis of the Gaseous Impact Test

    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.

    Keywords:

    gaseous impact test, adiabatic compression, oxygen compatibility, fluid flow, pressure waves, computer simulation, hot spot formation, skin temperature, design sensitivity


    Author Information:

    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,


    Paper ID: STP12498S

    Committee/Subcommittee: G04.01

    DOI: 10.1520/STP12498S


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