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TECHNICAL PAPERS

Separation Control on Low-Pressure Turbine Airfoils Using Synthetic Vortex Generator Jets

[+] Author and Article Information
Ralph J. Volino

Department of Mechanical Engineering, United States Naval Academy, Annapolis, MD 21402e-mail: volino@usna.edu

J. Turbomach 125(4), 765-777 (Dec 01, 2003) (13 pages) doi:10.1115/1.1626686 History: Received December 01, 2002; Revised March 01, 2003; Online December 01, 2003
Copyright © 2003 by ASME
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References

Figures

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Schematic of the test section
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Drawing of suction side airfoil with cavity and VGJ’s: (a) full airfoil, (b) cross section of VGJ holes
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Time trace of jet velocity and speaker input voltage, F+=0.65
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Cp profiles, F+=0.65, various blowing ratios
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Cp profiles, Bmax≈5, various F+
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Cp profiles, comparison of baseline, passive bar, and present jet case with Bmax=4.7 and F+=0.65
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Station 7–11 dimensionless time averaged profiles; comparison of baseline, passive bar and present jet cases: (a) mean velocity, (b) ū, (c) turbulent shear stress
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Time averaged shape factor and momentum thickness verses streamwise location; comparison of baseline, passive bar and present jet cases: (a) H, (b) θ
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Ensemble averaged dimensionless mean velocity (Ũ/Ue) profiles
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Ensemble averaged rms value of dimensionless streamwise fluctuating velocity (ũ/Ue) profiles
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Ensemble averaged dimensionless turbulent shear stress (−ũ/Ue2) profiles
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Time-space plot of ensemble averaged ũ/Ue at y/Ls=0.0004
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Time-space plot of ensemble averaged −ũ/Ue2 at y/Ls=0.0128
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Time-space plot of ensemble averaged dimensionless free-stream velocity Ũ/Ue
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Time-space plot of ensemble averaged Thwaites acceleration parameter λθ
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Time-space plot of ensemble averaged momentum thickness θ in mm
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Time-space plot of ensemble averaged shape factor H
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Time-space plot of ensemble averaged skin friction coefficient Ct; white areas with dots indicate separated flow

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