Effects of purge jet momentum on sealing effectiveness

Kenneth Clark, Michael David Barringer, Karen Ann Thole, Carey Clum, Paul Hiester, Curtis Memory, Christopher Robak

    Research output: Contribution to journalArticle

    4 Citations (Scopus)

    Abstract

    Driven by the need for higher cycle efficiencies, overall pressure ratios for gas turbine engines continue to be pushed higher thereby resulting in increasing gas temperatures. Secondary air, bled from the compressor, is used to cool turbine components and seal the cavities between stages from the hot main gas path. This paper compares a range of purge flows and two different purge hole configurations for introducing the purge flow into the rim cavities. In addition, the mate face gap leakage between vanes is investigated. For this particular study, stationary vanes at engine-relevant Mach and Reynolds numbers were used with a static rim seal and rim cavity to remove rotational effects and isolate gas path effects. Sealing effectiveness measurements, deduced from the use of CO2 as a flow tracer, indicate that the effectiveness levels on the stator and rotor side of the cavity depend on the mass and momentum flux ratios of the purge jets relative to the swirl velocity. For a given purge flow rate, fewer purge holes resulted in better sealing than the case with a larger number of holes.

    Original languageEnglish (US)
    Article number031904
    JournalJournal of Engineering for Gas Turbines and Power
    Volume139
    Issue number3
    DOIs
    StatePublished - Mar 1 2017

    Fingerprint

    Momentum
    Seals
    Gases
    Turbine components
    Stators
    Mach number
    Gas turbines
    Compressors
    Reynolds number
    Turbines
    Rotors
    Flow rate
    Fluxes
    Engines
    Air
    Temperature

    All Science Journal Classification (ASJC) codes

    • Nuclear Energy and Engineering
    • Fuel Technology
    • Aerospace Engineering
    • Energy Engineering and Power Technology
    • Mechanical Engineering

    Cite this

    Clark, Kenneth ; Barringer, Michael David ; Thole, Karen Ann ; Clum, Carey ; Hiester, Paul ; Memory, Curtis ; Robak, Christopher. / Effects of purge jet momentum on sealing effectiveness. In: Journal of Engineering for Gas Turbines and Power. 2017 ; Vol. 139, No. 3.
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    Effects of purge jet momentum on sealing effectiveness. / Clark, Kenneth; Barringer, Michael David; Thole, Karen Ann; Clum, Carey; Hiester, Paul; Memory, Curtis; Robak, Christopher.

    In: Journal of Engineering for Gas Turbines and Power, Vol. 139, No. 3, 031904, 01.03.2017.

    Research output: Contribution to journalArticle

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    AU - Clark, Kenneth

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    AU - Thole, Karen Ann

    AU - Clum, Carey

    AU - Hiester, Paul

    AU - Memory, Curtis

    AU - Robak, Christopher

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