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Research Papers

A Study of Mesh-Fed Slot Film Cooling

[+] Author and Article Information
R. S. Bunker

 General Electric Global Research Center, Niskayuna, NY 12309

J. Turbomach 133(1), 011022 (Sep 24, 2010) (8 pages) doi:10.1115/1.4000548 History: Received July 10, 2009; Revised July 14, 2009; Published September 24, 2010; Online September 24, 2010

This investigation demonstrates the potential improvement in adiabatic film effectiveness that can be achieved through the use of mesh-fed surface slot film cooling. Mesh, or in-wall network, cooling is composed of fairly compact arrays of pedestals sized to fit within the limited wall thickness of a turbine airfoil. When the coolant discharge from such a mesh is along a shallow ramp to the airfoil aerodynamic surface (i.e., like an angled film hole), the resulting film effectiveness from this combined geometry can be very high. The in-wall mesh network acts as the structural means for obtaining the slot geometry. In this study, flat plate warm wind tunnel testing has been conducted on two mesh-fed film geometries and compared against data for a row of axial round film holes, as well as a row of shaped diffuser film holes. The mesh-fed geometries are composed of pedestal arrays with height-to-diameter ratios of 0.2 exiting onto 20-deg inclines to the surface. The mesh slot exit film blowing ratios tested ranged from M=0.1 to M=0.7, while round and shaped film hole conditions covered 0.5 to 1.2. The mesh-fed film effectiveness results indicate a performance greater than that of shaped diffuser holes, but less than that of a more idealistic two-dimensional slot film geometry. The mesh-fed film effectiveness was as much as 25% higher than that for shaped holes in the near-hole region of x/Ms<50, and up to 100% greater in the downstream region of x/Ms>50.

Copyright © 2011 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Mesh-fed film cooled turbine airfoil (16)

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Figure 2

Schematic of test facility

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Figure 3

Test surface with mesh-fed film

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Figure 4

Full mesh geometry

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Figure 5

Full and half mesh pedestal arrays

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Figure 6

Infrared imaging of uncooled and cooled surfaces

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Figure 7

Baseline 30-deg round axial hole film effectiveness distributions

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Figure 8

Comparison of round hole data to literature cases

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Figure 9

Full mesh film effectiveness distributions

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Figure 10

Half mesh film effectiveness distributions

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Figure 11

Comparison of film effectiveness distributions for common blowing ratio

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Figure 12

Film slot test geometry for Hartnett (24)

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Figure 13

Full mesh film cooling compared with slot film in Ref. 24

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Figure 14

Comparison of full and half mesh film curves

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Figure 15

Comparison of full mesh, round hole, and shaped hole film curves

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