Research Papers: Gas Turbines: Heat Transfer

Unsteady Heat Transfer Measurements from Transonic Turbine Blades at Engine Representative Conditions in a Transient Facility

[+] Author and Article Information
W. D. Allan

Department of Mechanical Engineering, Royal Military College of Canada, Kingston, ON, K7K 7B4, Canadabilly.allan@rmc.ca

R. Ainsworth, S. Thorpe

 University of Oxford, Oxford OX1 2JD, United Kingdom

J. Eng. Gas Turbines Power 130(4), 041901 (Apr 23, 2008) (12 pages) doi:10.1115/1.2898836 History: Received December 04, 2006; Revised November 29, 2007; Published April 23, 2008

The unsteady heat transfer measurements about a transonic turbine blade at engine representative Mach and Reynolds numbers are presented. High density, fast-response thin film gauges are employed at the midheight streamline. A description of the novel development of gold gauges together with a brief overview of their calibration and signal processing is presented. Detailed time and phase-averaged measurements have been obtained, providing insight into the role of upstream nozzle guide vane (NGV) wakes and shock features. These heat transfer results compliment recent fast-response aerodynamic results on this and similar transonic profiles, which highlight the dominance of the upstream vane-rotor interaction over convected wake segments, particularly in light of unsteady turbine blade loading. From a heat transfer standpoint, however, while the periodic shock events contributed to abrupt, localized heat transfer enhancements, the influence of NGV wake segments on the boundary layer could not be discounted when duration of unsteadiness was considered.

Copyright © 2008 by American Society of Mechanical Engineers
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Figure 1

The negative jet effect of a wake segment in a rotor passage

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Figure 2

Formation of passage vortex around a stator

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Figure 3

The horseshoe (passage) vortex

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Figure 4

The stator trailing vortices

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Figure 21

Rotor midheight phase-averaged unsteady heat transfer

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Figure 22

Rotor midheight phase-averaged unsteady heat transfer pressure surface

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Figure 23

Rotor passage Schlieren flow visualization of shock activity (Doorly and Oldfield (5))

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Figure 24

Unsteady heat transfer measurements: run 6551 midheight Gauges 3–8

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Figure 6

Mask for photoetched thin film gauges

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Figure 7

Microscope photograph of a photoetched thin film gauge

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Figure 11

Rotor mean heat transfer rate: midheight streamline

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Figure 12

Rotor midheight Nusselt number

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Figure 13

Typical rotor relative gas-to-wall temperature ratio

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Figure 14

Rotor midheight mean heat transfer rate: comparison to 2D cascade/wake simulation results

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Figure 15

Demonstration of streamwise differences in unsteady heat-transfer-processed results

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Figure 16

Demonstration of streamwise differences in unsteady heat-transfer-repeated phase-averaged results

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Figure 19

Phase averaging: reliability between runs

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Figure 20

“Unsteadiness level” variations

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Figure 8

Midspan thin film gauges

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Figure 9

Data points averaged for mean heat transfer value

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Figure 10

Typical rotor speed versus time plot

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Figure 17

Rotor revolution-to-revolution variations in unsteady heat transfer

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Figure 18

Rotor revolution-to-revolution variations in phase-averaged unsteady heat transfer rate



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