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TECHNICAL PAPERS

Leading-Edge Film-Cooling Physics—Part III: Diffused Hole Effectiveness

[+] Author and Article Information
William D. York, James H. Leylek

Department of Mechanical Engineering, Clemson University, Clemson, SC 29634

J. Turbomach 125(2), 252-259 (Apr 23, 2003) (8 pages) doi:10.1115/1.1559899 History: Received October 10, 2001; Online April 23, 2003
Copyright © 2003 by ASME
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References

Figures

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View of the computational domain with dimensions in film-hole diameters (D=6.32 mm). The transparent side boundaries are periodic planes.
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Schematic of (a) the cylindrical (REF) film-hole, and (b) the conical diffuser (CDIFF) hole in the three orthogonal planes
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View of the film-hole and leading edge surface mesh at the Row2 hole breakout. The extremely dense grid in this region was necessary to achieve a y+ of unity or less along the walls while maintaining high quality cells.
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Contours of adiabatic effectiveness on the leading edge with CDIFF holes for (a) M=1.0, and (b) M=2.0
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Plots of predicted laterally averaged effectiveness for the CD, FF, and REF geometries of blowing ratios of (a) M=1.0, (b) M=1.5, (c) M=2.0, and (d) M=2.5
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Contours of Vy on the FHEP of the Row1 conical diffuser hole at M=2.0 show a fairly low, uniform coolant flow
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Lines of constant θ on three planes of constant z-coordinate between Row1 hole centerlines at the blowing ratio M=2.0. Note the extremely low trajectory of the coolant jet.
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Contours of Vy on a plane through the centerline of the Row2 film hole (from upstream to downstream edge) at M=2.0 shows the development of a jetting region
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Lines of constant Vy on the Row2 FHEP for (a) M=1.0, and (b) M=2.0 show the highly nonuniform velocity field at the diffuser exit
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Contours of θ on three planes of constant x-coordinate aft of the Row2 film hole for the blowing ratio M=2.0. The dashed lines mark the extent of the region on the surface in which θ≤0.3.
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Velocity vectors sized by in-plane velocity magnitude on the x/D=4.5 plane (just aft of the Row2 hole) at M=2.0 showing a relatively strong secondary flow. The gray line marks the θ=0.5 isotherm.
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Pathlines of the coolant from Row1 and Row2 for the case of M=2.0 show the strong interaction between rows
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Paths of massless particles released in the crossflow boundary layer just upstream of Row2 for M=2.0 show the vortex that brings crossflow below the FHEP
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Contours of θ on the FHEP of the Row2 conical diffuser hole for the cases of (a) M=1.0, and (b) M=2.0
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Lines of constant θ on the film-hole walls inside the Row2 CDIFF hole at blowing ratios of (a) M=1.0, and (b) M=2.0 reveal the severe heating of the metal surface near the TE

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