Material flammability is an important factor in determining the pressure and composition (fraction of oxygen and nitrogen) of the atmosphere in the habitable volume of exploration vehicles and habitats. The method chosen in this work to quantify material flammability is by its ease of ignition and the minimum (critical) radiant heat flux for ignition. Piloted ignition delay tests were conducted in the Forced Ignition and Spread Test (FIST) apparatus subject to various atmospheric pressures and oxygen concentrations. The ignition delay time was measured as the time it takes a combustible material to ignite after it has been exposed to an external heat flux. In these tests, polymethylmethacylate (PMMA) was exposed to an oxidizer flow velocity of 1 m/s and a range of externally applied heat flux levels from 8 to 14 kW/m2. Tests were conducted at standard atmospheric pressure and oxygen concentration as well as at the proposed exploration environment of lower pressure (58.6 kPa) and high oxygen concentration (32%). It was found that the ignition time in the proposed space exploration atmosphere was reduced by 27% compared to standard conditions. This finding indicates that materials will be more susceptible to ignition (shorter ignition delay) in exploration atmospheres when an external heat flux is applied.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Ignition Delay of Combustible Materials in Space Exploration Atmospheres


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Fernandez-Pello, Carlos (Autor:in) / Urban, David (Autor:in) / Ruff, Gary (Autor:in) / McAllister, Sara (Autor:in)

    Kongress:

    International Conference On Environmental Systems ; 2008



    Erscheinungsdatum :

    29.06.2008




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Ignition Delay of Combustible Materials in Space Exploration Atmospheres

    McAllister, S. / Fernandez-Pello, C. / Ruff, G. et al. | British Library Conference Proceedings | 2008


    Ignition Delay of Combustible Materials in Normoxic Equivalent Environments

    Fernandez-Pello, Carlos / Urban, David / Ruff, Gary et al. | SAE Technical Papers | 2009


    More About Hazard-Response Robot For Combustible Atmospheres

    Stone, Henry W. / Ohm, Timothy R. | NTRS | 1995