Detailed measurements of the heat transfer coefficient (htc) distributions on the internal surfaces of a novel gas turbine blade cooling configuration were carried out using a transient liquid crystal technique. The cooling geometry, in which a series of racetrack passages are connected to a central plenum, provides high heat transfer coefficients in regions of the blade in good thermal contact with the outer blade surface. The Reynolds number changes along its length because of the ejection of fluid through a series of 19 transfer holes in a staggered arrangement, which are used to connect ceramic cores during the casting process. Heat transfer coefficient distributions on these holes surface are particularly important in the prediction of blade life, as are heat transfer coefficients within the hole. The results at passage inlet Reynolds numbers of 21,667, 45,596, and 69,959 are presented along with in-hole htc distributions at , 12,479, 19,147; and suction ratios of 0.98, 1.31, 2.08, and 18.67, respectively. All values are engine representative. Characteristic regions of high heat transfer downstream of the transfer holes were observed with enhancement of up to 92% over the Dittus–Boelter level. Within the transfer holes, the average htc level was strongly affected by the cross-flow at the hole entrance. htc levels were low in these short holes fed from regions of developed boundary layer.
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April 2010
Research Papers
Detailed Heat Transfer Measurements in a Model of an Integrally Cast Cooling Passage
Ioannis Ieronymidis,
Ioannis Ieronymidis
Department of Engineering Science,
University of Oxford
, Parks Road, Oxford OX1 3PJ, UK
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David R. H. Gillespie,
David R. H. Gillespie
Department of Engineering Science,
e-mail: david.gillespie@eng.ox.ac.uk
University of Oxford
, Parks Road, Oxford OX1 3PJ, UK
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Peter T. Ireland,
Peter T. Ireland
Rolls-Royce plc.
, P.O. Box 3, Filton, Bristol BS34 7QE, UK
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Robert Kingston
Robert Kingston
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Ioannis Ieronymidis
Department of Engineering Science,
University of Oxford
, Parks Road, Oxford OX1 3PJ, UK
David R. H. Gillespie
Department of Engineering Science,
University of Oxford
, Parks Road, Oxford OX1 3PJ, UKe-mail: david.gillespie@eng.ox.ac.uk
Peter T. Ireland
Rolls-Royce plc.
, P.O. Box 3, Filton, Bristol BS34 7QE, UK
Robert Kingston
J. Turbomach. Apr 2010, 132(2): 021002 (9 pages)
Published Online: December 31, 2009
Article history
Received:
June 9, 2006
Revised:
June 21, 2006
Online:
December 31, 2009
Published:
December 31, 2009
Citation
Ieronymidis, I., Gillespie, D. R. H., Ireland, P. T., and Kingston, R. (December 31, 2009). "Detailed Heat Transfer Measurements in a Model of an Integrally Cast Cooling Passage." ASME. J. Turbomach. April 2010; 132(2): 021002. https://doi.org/10.1115/1.3140283
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