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Research Papers

Experimental Validation of Quasisteady Assumption in Modeling of Unsteady Film-Cooling

[+] Author and Article Information
Stefan Bernsdorf

 MAN TURBO, Hardstrasse 319, CH-8023 Zürich, Switzerland

Martin G. Rose, Reza S. Abhari

Institute of Energy Technologies, Department of Mechanical Engineering, Swiss Federal Institute of Technology-ETHZ, CH-8092 Zürich, Switzerland

J. Turbomach 130(1), 011022 (Jan 28, 2008) (12 pages) doi:10.1115/1.2720878 History: Received September 11, 2006; Revised October 30, 2006; Published January 28, 2008

This paper reports on the validation of the assumption of quasisteady behavior of pulsating cooling injection in the near hole flow region. The respective experimental data are taken in a flat plate wind tunnel at ETH Zürich. The facility simulates the film cooling row flow field on the pressure side of a turbine blade. Engine representative nondimensionals are achieved, providing a faithful model at a larger scale. Heating the free stream air and strongly cooling the coolant gives the required density ratio between coolant and free-stream. The coolant is injected with different frequency and amplitude. The three-dimensional velocities are recorded using nonintrusive PIV, and seeding is provided for both air streams. Two different cylindrical hole geometries are studied, with different angles. Blowing ratio is varied over a range to simulate pressure side film cooling. The general flow field, the jet trajectory, and the streamwise circulation are utilized in the validation of the quasisteady assumption.

Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic of the test rig

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Figure 2

Sketch of the test section

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Figure 3

Definition of the coordinates and dimensions

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Figure 4

Schematic of the injection arrangement

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Figure 5

Mounting of the PIV system

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Figure 6

BR variation for periodic cooling injection

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Figure 7

Velocity field at X=4, case 1 and case 11, phase 4∕12

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Figure 8

Velocity field at X=4, case 1 and case 11, phase average

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Figure 9

Velocity field at X=4, case 7 and case 14-phase 0∕12

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Figure 10

Velocity field at X=4, case 7 and case 14-phase average

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Figure 11

Velocity field at X=4, case 3 and case 11-phase 1∕12

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Figure 12

Time resolved isovelocity contour for case 11

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Figure 13

Comparison between new correlation and unsteady experimental data

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Figure 14

Trajectory at maximum and minimum blowing ratio for α=30deg, BR=1, fr=0.38

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Figure 15

Comparison between the new correlation and unsteady experimental data

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Figure 16

Trajectory at the maximum and minimum blowing ratio for 50deg, BR=1, fr=1.88

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Figure 17

Illustration of the area of circulation

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Figure 18

Typical circulation of the kidney vortex

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Figure 19

Influence of pulsating on the axial circulation; α=50deg, DR=1.0, BR=1.0

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