Annals of the Assembly for International Heat Transfer Conference 13

ISBN 1-56700-225-0 / CD 1-56700-226-9

Year 2006

H. P. Kissel
University of Stuttgart, Stuttgart, Germany

Bernhard Weigand
Institute of Aerospace Thermodynamics (ITLR), University of Stuttgart, Pfaffenwaldring 31, 70569 Stuttgart, Germany

J. von Wolfersdorf
Institute of Aerospace Thermodynamics, University of Stuttgart, Germany

A. Ungewickell
Rolls-Royce Deutschland Ltd & Co KG, Dahlewitz, Germany

This paper presents an experimental investigation into film cooling performance over a flat plate using thermochromic liquid crystals. Film cooling is a method used to cool turbine blades in gas turbine engines. The film cooling air flows through passages inside the blade; it is then exhausted through the film cooling holes onto the blade surface. The influence of the flow Reynolds number in the internal passages (cooling channel) on the heat transfer coefficient and film cooling effectiveness on the external surface (hot gas channel) is investigated for two hot gas channel Reynolds number (Re_d=6000, Re_d=20000). Experiments are conducted at constant blowing ratio, pressure ratio and film cooling hole mass flux. Furthermore, the effects of 45° angled ribs introduced into the cooling channel are discussed and compared to previously published literature. The transient liquid crystal method is used to determine the wall surface temperature T_w and a numerical regression method is presented to solve for the two unknowns h (heat transfer coefficient) and η (adiabatic film cooling effectiveness).

EQP-21 pages DOI: 10.1615/IHTC13.p22.210 Download article

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