Experimental measurements of an expansion deflection nozzle in open wake mode

N. V. Taylor, Tetsuya Satou

    Research output: Contribution to journalArticle

    7 Citations (Scopus)

    Abstract

    Expansion Deflection nozzles present an attractive proposition as a replacement for conventional nozzles on launch vehicles, due to their reduced length, and altitude compensating capability. However, it has long been speculated that they suffer in the latter regard due to aspiration of the low speed flow region inside the nozzle by the supersonic jet surrounding it. This effect is investigated in this paper by direct experimental measurement of base pressures, and found to have little effect on the base pressure of the nozzle within the range of operating conditions investigated. Wall pressures were also used to calculate the efficiency of the altitude compensation within the nozzle, which was found to be between 87 and 100% for the three operating pressure ratios examined. This represents a significant improvement over conventional nozzle performance, and further conformation that wake pressures are indeed close to ambient.

    Original languageEnglish
    Pages (from-to)377-386
    Number of pages10
    JournalJBIS - Journal of the British Interplanetary Society
    Volume60
    Issue number10
    Publication statusPublished - 2007 Oct

    Fingerprint

    deflection
    wakes
    nozzles
    Nozzles
    expansion
    base pressure
    wall pressure
    pressure ratio
    launch vehicles
    Launch vehicles
    replacement
    low speed
    Conformations
    vacuum
    effect

    Keywords

    • Expansion deflection
    • Experimental aerodynamics
    • Nozzles
    • Rocket propulsion

    ASJC Scopus subject areas

    • Engineering(all)

    Cite this

    Experimental measurements of an expansion deflection nozzle in open wake mode. / Taylor, N. V.; Satou, Tetsuya.

    In: JBIS - Journal of the British Interplanetary Society, Vol. 60, No. 10, 10.2007, p. 377-386.

    Research output: Contribution to journalArticle

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