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TECHNICAL PAPERS

Large-Scale Testing to Validate the Influence of External Crossflow on the Discharge Coefficients of Film Cooling Holes

[+] Author and Article Information
D. A. Rowbury

Rolls-Royce plc, Bristol, United Kingdom

M. L. G. Oldfield

Department of Engineering Science, University of Oxford, Oxford, United Kingdom

G. D. Lock

Department of Mechanical Engineering, University of Bath, Bath, United Kingdom

J. Turbomach 123(3), 593-600 (Feb 01, 2000) (8 pages) doi:10.1115/1.1375171 History: Received February 01, 2000
Copyright © 2001 by ASME
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References

Figures

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Cross section through a CHTT vane, illustrating the locations of film cooling rows 7 and 8
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Definition of film cooling hole flow angles
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Illustration of inlet separation and coolant “jetting,” as highlighted by the velocity ration, uh/um, contours for flow through a 35 deg inclined hole, at zero orientation and a blowing ratio of 1.25 [7]
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Illustration of how the location of the emerging jet influences the magnitude of the local pressure: (a) coolant emerging from the upstream portion of the hole; (b) coolant emerging from downstream portion of the hole
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Pressure tapping locations around: (a) “leading edge,” and (b) “normal” film cooling hole outlets. Numbering is to aid presentation of results.
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Close-up view of large-scale leading edge holes, illustrating the static pressure tapping locations
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Pressure coefficient, Cp=(ps−pm)/(p0m−pm)=(ps−pm)/0.5ρμ2, around the cylinder surface for two different tunnel velocities (or Reynolds numbers). The inviscid prediction is shown for comparison.
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Static pressure around a normal hole, with no external crossflow, measured relative to atmospheric pressure. As in all subsequent figures, numbering refers to Fig. 5.
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Static presssure around a leading edge film cooling hole, with external crossflow (I=65.9), measured relative to the static pressure calculated from the pressure coefficient
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Static pressure around a normal hole, with external crossflow (I=2.78), measured relative to the static pressure calculated from Cp
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Average difference in static pressure around leading edge hole, with external crossflow (I=67.5) versus angle from the cylinder leading edge
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Cd,crossflow/Cd,no crossflow for leading edge hole, with I∼67.5, calculated using the external static pressure as either expected or “measured”
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Cd,crossflow/Cd,no crossflow for leading edge hole, with I∼2.50, calculated using the external static pressure as either expected or “measured”
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Cd,crossflow/Cd,no crossflow for normal hole, with I∼82.0, calculated using the external static pressure as either expected or measured
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Cd,crossflow/Cd,no crossflow for normal hole, with I∼2.80, calculated using the external static pressure as either expected or measured

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