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.

Copyright © 2012 by American Society of Mechanical Engineers
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Figure 1

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

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Figure 2

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

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Figure 3

A basic TSP setup

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Figure 4

TSP calibration curve

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Figure 5

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

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Figure 6

Sample temperature maps on the platform surface

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Figure 7

Adiabatic effectiveness distribution at two different freestream turbulence intensities

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Figure 8

Adiabatic effectiveness distribution at three different purge flow rates

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Figure 9

Adiabatic effectiveness distribution at three different blowing ratios

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Figure 10

Adiabatic effectiveness distribution at three different density ratios

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Figure 11

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



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