Abstract The propagation of laminar dust flames in suspensions of iron in gaseous oxidizers was studied in a low-gravity environment onboard a parabolic flight aircraft. The reduction of buoyancy-induced convective flows and particle settling permitted the measurement of fundamental combustion parameters, such as the burning velocity and the flame quenching distance over a wide range of particle sizes and in different gaseous mixtures. Experimentally measured flame speeds and quenching distances were found in good agreement with theoretical predictions of a simplified analytical model that assumes particles burning in a diffusive mode. However, the comparison of flame speeds in oxygen–argon and oxygen–helium iron suspensions indicates the possibility that fine micron-sized particles burn in the kinetic mode. Furthermore, when the particle spacing is large compared to the scale of the reaction zone, a theoretical analysis suggests the existence of a new so-called discrete flame propagation regime. Discrete flames are strongly dependent on particle density fluctuations and demonstrate directed percolation behavior near flame propagation limits. The experimental observation of discrete flames in particle suspensions will require low levels of gravity over extended periods available only on orbital platforms.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Laminar dust flames in a reduced-gravity environment


    Beteiligte:

    Erschienen in:

    Acta Astronautica ; 68 , 7-8 ; 656-666


    Erscheinungsdatum :

    2010-08-28


    Format / Umfang :

    11 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch




    Laminar dust flames in a reduced-gravity environment

    Goroshin, Samuel | Online Contents | 2011


    Laminar diffusion flames under micro-gravity conditions

    EDELMAN, RAYMOND / BAHADORI, YOUSEF / OLSON, SANDRA et al. | AIAA | 1988


    Effects of gravity on laminar gas jet diffusion flames

    Cochran, Thomas H. / Masica, William J. | TIBKAT | 1970


    Reduced Order Model of Laminar Premixed Inverted Conical Flames

    da Costa Ramos, Louise / Di Meglio, Florent / Da Silva, Luis Fernando F. et al. | AIAA | 2020


    EFFECTS OF PRESSURE AND GRAVITY IN LAMINAR COFLOW ETHYLENE DIFFUSION FLAMES

    Charest, M. / Groth, C. / Gulder, O. et al. | British Library Conference Proceedings | 2011