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Experimental investigation into unsteady effects on film cooling

Experimental investigation into unsteady effects on film cooling
Experimental investigation into unsteady effects on film cooling
The benefits of different film cooling geometries are typically assessed in terms of their time-averaged performance. It is known that the mixing between the coolant film and the main turbine passage flow is an unsteady process. The current study investigates the forms of unsteadiness that occur in engine-representative film cooling flows and how this unsteadiness affects the mixing with the mainstream flow. Cylindrical and fan-shaped cooling holes across a range of hole blowing ratios have been studied experimentally using particle image velocimetry and high speed photography. Coherent unsteadiness is found in the shear layer between the jet and the mainstream for both cylindrical and fan-shaped cooling holes. Its occurrence and sense of rotation is found to be controlled by the velocity difference between the mainstream flow and the jet, which is largely determined by the blowing ratio.
0889-504X
021015-1-021015-9
Fawcett, Richard J.
8ee84ddc-fbc7-4a97-8a95-5990632a1d83
Wheeler, Andrew P.S.
0f243ba3-3aae-470c-ba4a-46a8c4b9197a
He, Li
fed5e713-b34d-4f0a-ad5f-da317f5fed61
Taylor, Rupert
b54dea5c-5067-41e3-9f24-ac61df8ab0fe
Fawcett, Richard J.
8ee84ddc-fbc7-4a97-8a95-5990632a1d83
Wheeler, Andrew P.S.
0f243ba3-3aae-470c-ba4a-46a8c4b9197a
He, Li
fed5e713-b34d-4f0a-ad5f-da317f5fed61
Taylor, Rupert
b54dea5c-5067-41e3-9f24-ac61df8ab0fe

Fawcett, Richard J., Wheeler, Andrew P.S., He, Li and Taylor, Rupert (2012) Experimental investigation into unsteady effects on film cooling. Journal of Turbomachinery, 134 (2), 021015-1-021015-9. (doi:10.1115/1.4003053).

Record type: Article

Abstract

The benefits of different film cooling geometries are typically assessed in terms of their time-averaged performance. It is known that the mixing between the coolant film and the main turbine passage flow is an unsteady process. The current study investigates the forms of unsteadiness that occur in engine-representative film cooling flows and how this unsteadiness affects the mixing with the mainstream flow. Cylindrical and fan-shaped cooling holes across a range of hole blowing ratios have been studied experimentally using particle image velocimetry and high speed photography. Coherent unsteadiness is found in the shear layer between the jet and the mainstream for both cylindrical and fan-shaped cooling holes. Its occurrence and sense of rotation is found to be controlled by the velocity difference between the mainstream flow and the jet, which is largely determined by the blowing ratio.

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e-pub ahead of print date: 28 June 2011
Published date: March 2012
Organisations: Aeronautics, Astronautics & Comp. Eng

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Local EPrints ID: 334468
URI: https://eprints.soton.ac.uk/id/eprint/334468
ISSN: 0889-504X
PURE UUID: af390689-3c65-456d-99ba-9cf09fb8353c

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Date deposited: 08 Mar 2012 13:19
Last modified: 02 Dec 2019 20:59

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Contributors

Author: Richard J. Fawcett
Author: Andrew P.S. Wheeler
Author: Li He
Author: Rupert Taylor

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