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AN EXPERIMENTAL STUDY OF AIRFOIL AND ENDWALL HEAT TRANSFER IN A LINEAR TURBINE BLADE CASCADE − SECONDARY FLOW AND SURFACE ROUGHNESS EFFECTS

DOI: 10.1615/ICHMT.2009.HeatTransfGasTurbSyst.410
18 pages

Marco Lorenz
Institut fuer Thermische Stroemungsmaschinen, Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany

Achmed Schulz
Institut fuer Thermische Stroemungsmaschinen (ITS), Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany

Hans-Jorg Bauer
Institut fuer Thermische Stroemungsmaschinen (ITS), Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany

要約

The present study is part of a comprehensive heat transfer analysis on a highly loaded turbine blade and endwall with varying surface roughness. In this paper a smooth airfoil with an endwall of varying surface roughness is considered in order to investigate secondary flow and surface roughness effects on airfoil and endwall heat transfer. The measurements have been conducted in a linear cascade with low pressure blades at several freestream turbulence levels (Tu1 = 1.4% to 10.1%) and varying inlet Reynolds numbers (Re1,c = 50 000 to 250 000). Aerodynamic measurements on the airfoil at midspan have been carried out and complemented by oil paint visualization on airfoil and platform. Heat transfer on both the full-span suction and pressure surfaces of the airfoil and endwall is shown for smooth surfaces. Moreover, rough endwall surfaces are compared to the smooth reference case showing a maximum increase of local heat transfer of up to 240% due to surface roughness.

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