An analytical and experimental program has been initiated to improve the prediction of external heat transfer coefficients on turbine airfoils. Boundary layer codes have been employed throughout the gas turbine community to predict external heat transfer coefficients on turbine airfoils and the predictions from these codes have been compared to data that was generally obtained from two-dimensional cascade tests. The ability to accurately predict the data has been mixed. Of primary interest to the airfoil cooling designer is the ability to predict the heat transfer coefficients for the engine environment. The engine environment produces a complex flow structure within the airfoil passages resulting from turbulence generated by the combustion process, vane wakes, rotation, secondary flows, etc. Improved empirical models need to be developed to account for these engine effects in the boundary layer codes. As a result, several test programs have been initiated to define the engine environment effect on airfoil heat transfer levels. The first experimental test program was conducted in a two-dimensional cascade to obtain baseline heat transfer coefficients. The airfoil cross-section tested duplicated the mid-span of a turbine blade that is being instrumented for an engine test. The engine test data will enable the determination of heat transfer coefficients which can be directly compared to the cascade data to quantify the engine environment effects. This technical paper will present a comparison of the measured and predicted heat transfer coefficients for the cascade test and present plans for obtaining data to quantify the engine environmental effects.


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    Title :

    Design code verification of external heat transfer coefficients


    Additional title:

    Ueberpruefung der aeusseren Waermeuebergangskoeffizienten in den Konstruktionsvorschriften


    Contributors:

    Published in:

    AIAA-Papers ; Jul ; 1-5


    Publication date :

    1988


    Size :

    5 Seiten, 14 Bilder, 3 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English






    Nonuniform Heat Transfer Coefficients for Heat Exchanger Thermal Design

    Shah, R. K. / Assembly of World Conferences on Experimental Heat Transfer, Fluid Mechanics and Thermodynamics / American Society of Mechanical Engineers | British Library Conference Proceedings | 1993


    Nonuniform Heat Transfer Coefficients for Heat Exchanger Thermal Design

    Shah, R. K. / Assembly of World Conferences on Experimental Heat Transfer, Fluid Mechanics and Thermodynamics / American Society of Mechanical Engineers | British Library Conference Proceedings | 1993