Date of Award
Master of Science
Department of Aeronautics and Astronautics
Jeffrey P. Bons, PhD
This work used scaled samples of actual turbine blade surfaces to characterize correlations between turbine surface roughness, friction coefficient, and convective heat transfer rate-parameters which affect an engine's efficiency and the blade's lifespan. For erosion/deposits, friction coefficients up to 250 times higher and convective heat transfer coefficients of up to 150 times higher were found when compared to a flat plate baseline. Other roughness types (pitting and fuel deposits) yielded less dramatic results. These results did not follow existing friction coefficient-to-heat transfer coefficient correlations, such as the Reynolds analogy. While these analytical and empirical correlations hold for flat plates, they may be inadequate to describe the highly irregular surface roughness found on real in-service turbine blades.
DTIC Accession Number
Drab, Jess W., "Turbine Blade Surface Roughness Effects on Shear Drag and Heat Transfer" (2001). Theses and Dissertations. 4600.