An experimental study is conducted to determine the effect of gravity changes on the natural convection smolder characteristics of flexible polyurethane foam. Gravity, and consequently buoyancy, is expected to affect smoldering because it induces convective transport of mass and heat to and from the reaction zone. The overall objective of the work is to provide information about the potential onset of a smolder-initiated fire in a space-based facility. Experiments are conducted in an aircraft following parabolic trajectories that provide up to 25 s of low gravity (KC-135A) and up to 20 s (Learjet Model 25), with a pull-up and pull-out of approximately 2 g per parabola. Measurements are performed, during a series of parabolas, of the temperature histories of the polyurethane foam at several locations along the fuel sample interior, both for upward and downward propagation. The measurements show that gravity plays a significant role in the competition between the supply of oxidizer to, and the transfer of heat to and from, the reaction zone.


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    Titel :

    Experimental observations of the effect of gravity changes on smoldering combustion


    Beteiligte:
    Torero, J. L. (Autor:in) / Fernandez-Pello, A. C. (Autor:in) / Urban, D. (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    1994-05-01



    Medientyp :

    Sonstige


    Format :

    Keine Angabe


    Sprache :

    Englisch




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