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
Your Session has timed out. Please sign back in to continue.



Grahic Jump Location
Figure 1

Mesh-fed film cooled turbine airfoil (16)

Grahic Jump Location
Figure 2

Schematic of test facility

Grahic Jump Location
Figure 3

Test surface with mesh-fed film

Grahic Jump Location
Figure 4

Full mesh geometry

Grahic Jump Location
Figure 5

Full and half mesh pedestal arrays

Grahic Jump Location
Figure 6

Infrared imaging of uncooled and cooled surfaces

Grahic Jump Location
Figure 7

Baseline 30-deg round axial hole film effectiveness distributions

Grahic Jump Location
Figure 8

Comparison of round hole data to literature cases

Grahic Jump Location
Figure 9

Full mesh film effectiveness distributions

Grahic Jump Location
Figure 10

Half mesh film effectiveness distributions

Grahic Jump Location
Figure 11

Comparison of film effectiveness distributions for common blowing ratio

Grahic Jump Location
Figure 12

Film slot test geometry for Hartnett (24)

Grahic Jump Location
Figure 13

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

Grahic Jump Location
Figure 14

Comparison of full and half mesh film curves

Grahic Jump Location
Figure 15

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




Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In