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TECHNICAL PAPERS

Turbine Separation Control Using Pulsed Vortex Generator Jets

[+] Author and Article Information
Jeffrey P. Bons

Air Force Insitute of Technology

Rolf Sondergaard, Richard B. Rivir

Air Force Research Laboratory, Wright-Patterson AFB, OH 44135

J. Turbomach 123(2), 198-206 (Feb 01, 2000) (9 pages) doi:10.1115/1.1350410 History: Received February 01, 2000
Copyright © 2001 by ASME
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References

Figures

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Pressure loss coefficient versus Reynolds number (from 1)
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Low-speed linear cascade test facility
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ASC blade geometry and pulsed valve configuration; inset shows VGJ configuration (free-stream into page)
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Pressure coefficient versus axial chord for uncontrolled blade. Re=100k, 50k, and 25k and Tu=1 percent versus VBI prediction. Re=50k and 25k data over limited portion of suction surface only.
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Boundary layer profiles of streamwise velocity normalized by midchannel velocity at three chordwise stations: 68, 73, and 77 percent axial chord. Re=25k, Tu=1 percent, and B=0.
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Wake loss coefficient profiles at 0.64 axial chord lengths downstream of trailing edge. Re=100k, 50k, and 25k and Tu=1 percent, Wakes from blades 4, 5, and 6 with B=0.
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Integrated wake loss coefficient (γint) normalized by loss coefficient for B=0 versus mean blowing ratio (B). Data for pulsed blowing at 10 Hz and 50 percent duty cycle versus steady blowing at Re=25k.
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Pressure coefficient versus axial chord for B=0,B=2 (steady blowing), and B=0.2 (pulsed blowing at 10 Hz and 50 percent duty cycle). VGJs at 63 percent Cx and Re=25k. (VBI prediction also indicated.)
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Boundary layer profiles of u normalized by mid-channel velocity and local turbulence level. Profiles at 3 chordwise stations: 68, 77, and 87 percent axial chord. Re=25 k. Pulsed VGJs at 63 percent Cx with B=0.2, 10 Hz and 50 percent duty cycle. (a) Mean streamwise velocity (u/U) boundary layer profiles. (b)Turbulence (u/u) boundary layer profiles.
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Instantaneous streamwise velocity measurements near the wall and at boundary layer edge for the 77 percent Cx profile. Pulsed blowing at 63 percent Cx with B=0.2 at 10 Hz. five-forcing periods evident. Re=25k.
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Power spectral density plots at midboundary layer on the 68 percent Cx profile. Data for B=0,B=2 (steady blowing), and B=0.2 (pulsed blowing at 10 Hz and 50 percent duty cycle). VGJs at 63 percent Cx. Re=25k.
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Power spectral density plots for B=0.2 (10 Hz pulsed) with VGJs at 63 percent Cx. Data at y=δ/2 on the 60 percent Cx profile, y=δ on the 81 percent Cx profile, and y=2δ on the 96 percent Cx profile. Re=25k [d≡δ in legends].
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Instantaneous jet exit blowing ratios for various duty cycles all at 10 Hz. Data taken with subminiature hotfilm probe in VGJ exit at 63 percent Cx. Re=25k.
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Normalized integrated wake loss coefficient (γintint0 versus pulsing duty cycle for constant maximum blowing ratio (Bmax=2, see Fig. 13). Data for pulsed blowing at 10 Hz. Re =25k.
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Boundary layer profiles of u normalized by mid-channel velocity and local turbulence level. Profiles at 68 percent Cx and 3 spanwise stations spaced 5d apart (VGJ spacing is 10d). Re=25k. Pulsed VGJs at 63 percent Cx with B=0.2, 10 Hz and 50 percent duty cycle. (a) Mean streamwise velocity (u/U) bounday layer profiles. (b) Turbulence (u/u) boundary layer profiles.
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Boundary layer profiles of u normalized by midchannel velocity and local turbulence level. Profiles at 77 percent Cx for three different cases: pulsed VGJs at B=0.2 and 10 Hz (50 percent duty cycle), steady VGJs at B=2, and 1-m diam. trip all at 45 percent Cx. Re=25k. (a) Mean streamwise velocity (u/U) boundary layer profiles. (b) Turbulence (u/u) boundary layer profiles.

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