A film-cooling correlation for shaped holes on a flat-plate surface

Will F. Colban, Karen Ann Thole, David Bogard

    Research output: Contribution to journalArticle

    78 Citations (Scopus)

    Abstract

    A common method of optimizing coolant performance in gas turbine engines is through the use of shaped film-cooling holes. Despite widespread use of shaped holes, existing correlations for predicting performance are limited to narrow ranges of parameters. This study extends the prediction capability for shaped holes through the development of a physics-based empirical correlation for predicting laterally averaged film-cooling effectiveness on a flat-plate downstream of a row of shaped film-cooling holes. Existing data were used to determine the physical relationship between film-cooling effectiveness and several parameters, including blowing ratio, hole coverage ratio, area ratio, and hole spacing. Those relationships were then incorporated into the skeleton form of an empirical correlation, using results from the literature to determine coefficients for the correlation. Predictions from the current correlation, as well as existing shaped-hole correlations and a cylindrical hole correlation, were compared with the existing experimental data. Results show that the current physics-based correlation yields a significant improvement in predictive capability, by expanding the valid parameter range and improving agreement with experimental data. Particularly significant is the inclusion of higher blowing ratio conditions (up to M=2.5) into the current correlation, whereas the existing correlations worked adequately only at lower blowing ratios (M≈0.5).

    Original languageEnglish (US)
    Article number011002
    JournalJournal of Turbomachinery
    Volume133
    Issue number1
    DOIs
    StatePublished - Jan 31 2011

    Fingerprint

    Blow molding
    Cooling
    Physics
    Coolants
    Gas turbines
    Turbines

    All Science Journal Classification (ASJC) codes

    • Mechanical Engineering

    Cite this

    @article{25877a16b0a8484594732fcc60b3c542,
    title = "A film-cooling correlation for shaped holes on a flat-plate surface",
    abstract = "A common method of optimizing coolant performance in gas turbine engines is through the use of shaped film-cooling holes. Despite widespread use of shaped holes, existing correlations for predicting performance are limited to narrow ranges of parameters. This study extends the prediction capability for shaped holes through the development of a physics-based empirical correlation for predicting laterally averaged film-cooling effectiveness on a flat-plate downstream of a row of shaped film-cooling holes. Existing data were used to determine the physical relationship between film-cooling effectiveness and several parameters, including blowing ratio, hole coverage ratio, area ratio, and hole spacing. Those relationships were then incorporated into the skeleton form of an empirical correlation, using results from the literature to determine coefficients for the correlation. Predictions from the current correlation, as well as existing shaped-hole correlations and a cylindrical hole correlation, were compared with the existing experimental data. Results show that the current physics-based correlation yields a significant improvement in predictive capability, by expanding the valid parameter range and improving agreement with experimental data. Particularly significant is the inclusion of higher blowing ratio conditions (up to M=2.5) into the current correlation, whereas the existing correlations worked adequately only at lower blowing ratios (M≈0.5).",
    author = "Colban, {Will F.} and Thole, {Karen Ann} and David Bogard",
    year = "2011",
    month = "1",
    day = "31",
    doi = "10.1115/1.4002064",
    language = "English (US)",
    volume = "133",
    journal = "Journal of Turbomachinery",
    issn = "0889-504X",
    publisher = "American Society of Mechanical Engineers(ASME)",
    number = "1",

    }

    A film-cooling correlation for shaped holes on a flat-plate surface. / Colban, Will F.; Thole, Karen Ann; Bogard, David.

    In: Journal of Turbomachinery, Vol. 133, No. 1, 011002, 31.01.2011.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - A film-cooling correlation for shaped holes on a flat-plate surface

    AU - Colban, Will F.

    AU - Thole, Karen Ann

    AU - Bogard, David

    PY - 2011/1/31

    Y1 - 2011/1/31

    N2 - A common method of optimizing coolant performance in gas turbine engines is through the use of shaped film-cooling holes. Despite widespread use of shaped holes, existing correlations for predicting performance are limited to narrow ranges of parameters. This study extends the prediction capability for shaped holes through the development of a physics-based empirical correlation for predicting laterally averaged film-cooling effectiveness on a flat-plate downstream of a row of shaped film-cooling holes. Existing data were used to determine the physical relationship between film-cooling effectiveness and several parameters, including blowing ratio, hole coverage ratio, area ratio, and hole spacing. Those relationships were then incorporated into the skeleton form of an empirical correlation, using results from the literature to determine coefficients for the correlation. Predictions from the current correlation, as well as existing shaped-hole correlations and a cylindrical hole correlation, were compared with the existing experimental data. Results show that the current physics-based correlation yields a significant improvement in predictive capability, by expanding the valid parameter range and improving agreement with experimental data. Particularly significant is the inclusion of higher blowing ratio conditions (up to M=2.5) into the current correlation, whereas the existing correlations worked adequately only at lower blowing ratios (M≈0.5).

    AB - A common method of optimizing coolant performance in gas turbine engines is through the use of shaped film-cooling holes. Despite widespread use of shaped holes, existing correlations for predicting performance are limited to narrow ranges of parameters. This study extends the prediction capability for shaped holes through the development of a physics-based empirical correlation for predicting laterally averaged film-cooling effectiveness on a flat-plate downstream of a row of shaped film-cooling holes. Existing data were used to determine the physical relationship between film-cooling effectiveness and several parameters, including blowing ratio, hole coverage ratio, area ratio, and hole spacing. Those relationships were then incorporated into the skeleton form of an empirical correlation, using results from the literature to determine coefficients for the correlation. Predictions from the current correlation, as well as existing shaped-hole correlations and a cylindrical hole correlation, were compared with the existing experimental data. Results show that the current physics-based correlation yields a significant improvement in predictive capability, by expanding the valid parameter range and improving agreement with experimental data. Particularly significant is the inclusion of higher blowing ratio conditions (up to M=2.5) into the current correlation, whereas the existing correlations worked adequately only at lower blowing ratios (M≈0.5).

    UR - http://www.scopus.com/inward/record.url?scp=79251514608&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=79251514608&partnerID=8YFLogxK

    U2 - 10.1115/1.4002064

    DO - 10.1115/1.4002064

    M3 - Article

    AN - SCOPUS:79251514608

    VL - 133

    JO - Journal of Turbomachinery

    JF - Journal of Turbomachinery

    SN - 0889-504X

    IS - 1

    M1 - 011002

    ER -