We investigate by means of laboratory experiments crater evolution in a bed of loose particles caused by an impinging subsonic jet. Attending physical considerations, which may apply to rocket-propelled vehicles during landing and take-off operations, are based on a simple force balance between the fluid forces and particle weight and account for the effects of bed permeability on cratering. Three bed materials were used with mean diameter ranging from 134-μm to 6-mm and particle density ranging from 0.9 g cm–3 to 2.65 g cm–3. We show that the equilibrium crater depth is weakly influenced by permeability of the bed material and introduce a Reynolds number, based on bed permeability, which captures this effect. Finally, we provide an empirical means to the estimate the maximum crater sidewall slopes and evolving crater depth as a function of jet strength.


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    Title :

    Crater Evolution Due to a Jet Impinging on a Bed of Loose Particles


    Contributors:

    Conference:

    11th Biennial ASCE Aerospace Division International Conference on Engineering, Science, Construction, and Operations in Challenging Environments ; 2008 ; Long Beach, California, United States


    Published in:

    Publication date :

    2008-09-04




    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English




    Cratering by a Subsonic Jet Impinging on a Bed of Loose Particles

    Haehnel, R. B. / Cushman-Roisin, B. / Dade, W. B. et al. | British Library Conference Proceedings | 2006


    Cratering by a Subsonic Jet Impinging on a Bed of Loose Particles

    Haehnel, R. B. / Cushman-Roisin, B. / Dade, W. B. et al. | British Library Conference Proceedings | 2006