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

Will F. Colban, Karen Ann Thole, David Bogard

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

    20 Scopus citations


    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 was 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 to 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)
    Title of host publication2008 Proceedings of the ASME Turbo Expo: Power for Land, Sea, and Air
    Number of pages16
    EditionPART A
    Publication statusPublished - 2008
    Event2008 ASME Turbo Expo - 2008 ASME Turbo Expo, Germany
    Duration: Jun 9 2008Jun 13 2008


    Other2008 ASME Turbo Expo
    City2008 ASME Turbo Expo


    All Science Journal Classification (ASJC) codes

    • Engineering(all)

    Cite this

    Colban, W. F., Thole, K. A., & Bogard, D. (2008). A film-cooling correlation for shaped holes on a flat-plate surface. In 2008 Proceedings of the ASME Turbo Expo: Power for Land, Sea, and Air (PART A ed., Vol. 4, pp. 65-80) https://doi.org/10.1115/GT2008-50121