Investigation of sand blocking within impingement and film-cooling holes

N. D. Cardwell, Karen Ann Thole, S. W. Burd

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    1 Scopus citations

    Abstract

    Gas turbines are not generally designed for operation with a particle laden inlet flow but, in fact, are commonly operated in unclean environments resulting in dirt, sand, and other debris ingestion. In addition to the negative effects within the main gas path, for aeroengines these particles are pulled into the coolant system where they can clog cooling passages and erode internal surfaces. Unlike previous research that focused on deposition and erosion within the main gas path, this study evaluated blocking in a double wall liner whereby both impingement and film-cooling holes were simulated. Double wall liners are commonly used in the combustor and turbine for combined internal and external cooling of metal components. Specifically, sand blockages were evaluated through comparisons of measured flowrates for a particular pressure ratio across the liner. Four liner geometries were tested whereby the coolant hole size and orientation were varied in test coupons. At ambient temperature, blocking was shown to be a function of the impingement flow area. A significant rise in blocking was observed as sand and metal temperatures were increased. The overlap between the impingement and film-cooling holes was also found to have a significant effect.

    Original languageEnglish (US)
    Title of host publication2008 Proceedings of the ASME Turbo Expo
    Subtitle of host publicationPower for Land, Sea, and Air
    Pages1147-1159
    Number of pages13
    Volume4
    EditionPART B
    DOIs
    StatePublished - Dec 1 2008
    Event2008 ASME Turbo Expo - Berlin, Germany
    Duration: Jun 9 2008Jun 13 2008

    Other

    Other2008 ASME Turbo Expo
    Country/TerritoryGermany
    CityBerlin
    Period6/9/086/13/08

    All Science Journal Classification (ASJC) codes

    • Engineering(all)

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