0
Research Papers

Influence of Coolant Density on Turbine Blade Platform Film-Cooling

[+] Author and Article Information
Diganta P. Narzary, Kuo-Chun Liu

Turbine Heat Transfer Laboratory, Department of Mechanical Engineering,  Texas A&M University, College Station, TX 77843-3123

Je-Chin Han

Turbine Heat Transfer Laboratory, Department of Mechanical Engineering,  Texas A&M University, College Station, TX 77843-3123jc-han@tamu.edu

J. Thermal Sci. Eng. Appl 4(2), 021002 (Apr 16, 2012) (10 pages) doi:10.1115/1.4005732 History: Received April 25, 2011; Revised November 03, 2011; Published April 16, 2012; Online April 16, 2012

Detailed parametric study of film-cooling effectiveness was carried out on a turbine blade platform of a five-blade linear cascade. The parameters chosen were freestream turbulence intensity, upstream stator-rotor purge flow rate, discrete-hole film-cooling blowing ratio, and coolant-to-mainstream density ratio. The measurement technique adopted was temperature sensitive paint (TSP) technique. Two turbulence intensities of 4.2% and 10.5%; three purge flows between the range of 0.25% and 0.75% of mainstream flow rate; three blowing ratios between 1.0 and 1.8; and three density ratios between 1.1 and 2.2 were investigated. Purge flow was supplied via a typical double-toothed stator-rotor seal, whereas the discrete-hole film-cooling was accomplished via two rows of cylindrical holes arranged along the length of the platform. The inlet and the exit Mach numbers were 0.27 and 0.44, respectively. Reynolds number of the mainstream flow was 7.5 * 105 based on the exit velocity and chord length of the blade. Results indicated that platform film-cooling effectiveness decreased with turbulence intensity, increased with purge flow rate and density ratio, and possessed an optimum blowing ratio value.

FIGURES IN THIS ARTICLE
<>
Copyright © 2012 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 1

Schematic of (a) experimental facility and (b) linear cascade

Grahic Jump Location
Figure 2

Schematic of (a) purge slot and (b) discrete film-cooling holes

Grahic Jump Location
Figure 3

A basic TSP setup

Grahic Jump Location
Figure 4

TSP calibration curve

Grahic Jump Location
Figure 5

(a) Turbulence intensity and (b) velocity profiles at the inlet of the cascade with and without the turbulence grid

Grahic Jump Location
Figure 6

Sample temperature maps on the platform surface

Grahic Jump Location
Figure 7

Adiabatic effectiveness distribution at two different freestream turbulence intensities

Grahic Jump Location
Figure 8

Adiabatic effectiveness distribution at three different purge flow rates

Grahic Jump Location
Figure 9

Adiabatic effectiveness distribution at three different blowing ratios

Grahic Jump Location
Figure 10

Adiabatic effectiveness distribution at three different density ratios

Grahic Jump Location
Figure 11

Laterally averaged adiabatic effectiveness as a function of (a) turbulence intensity, (b) purge flow rate, (c) blowing ratio, and (d) density ratio

Tables

Errata

Discussions

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