A parametric investigation has been made of thrust augmentation of a 1 inch diameter pulsed detonation tube by ejectors. A set of ejectors was used which permitted variation of the ejector length, diameter, and nose radius, according to a statistical design of experiment scheme. The maximum augmentations for each ejector were fitted using a polynomial response surface, from which the optimum ejector diameters, and nose radius, were found. Thrust augmentations above a factor of 2 were measured. In these tests, the pulsed detonation device was run on approximately stoichiometric air-hydrogen mixtures, at a frequency of 20 Hz. Later measurements at a frequency of 40 Hz gave lower values of thrust augmentation. Measurements of thrust augmentation as a function of ejector entrance to detonation tube exit distance showed two maxima, one with the ejector entrance upstream, and one downstream, of the detonation tube exit. A thrust augmentation of 2.5 was observed using a tapered ejector.


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    Title :

    Parametric Investigation of Thrust Augmentation by Ejectors on a Pulsed Detonation Tube


    Contributors:
    J. Wilson (author) / A. Sgondea (author) / D. E. Paxson (author) / B. N. Rosenthal (author)

    Publication date :

    2005


    Size :

    20 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English






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