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TECHNICAL PAPERS

The Fluid Dynamics of LPT Blade Separation Control Using Pulsed Jets

[+] Author and Article Information
Jeffrey P. Bons

Air Force Institute of Technology, Wright-Patterson AFB, OH 45433

Rolf Sondergaard, Richard B. Rivir

Air Force Research Laboratory, Wright-Patterson AFB, OH 45433

J. Turbomach 124(1), 77-85 (Feb 01, 2001) (9 pages) doi:10.1115/1.1425392 History: Received February 01, 2001
Copyright © 2002 by ASME
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References

Figures

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Low-speed linear cascade test facility
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Pulsed VGJ blade geometry, inset showing VGJ configuration (freestream into page)
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Loss coefficient γint versus inlet Reynolds number; Tuin=1 percent,Tuin=4 percent, and VBI prediction
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Integrated wake loss coefficient (γint) profiles normalized by loss coefficient for B=0 versus mean blowing ratio (B); data for pulsed blowing at 10 Hz (F+=0.31) and 50 percent duty cycle versus steady blowing at Re=25k and 63 percent Cx
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Instantaneous jet exit blowing ratios for various duty cycles all at 10 Hz (F+=0.31); 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 (B2max, see Fig. 5); data for pulsed blowing at 10 Hz (F+=0.31); Re=25k
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Normalized integrated wake loss coefficient (γintint0) versus dimensionless forcing frequency (F+) for two duty cycles and at constant mean blowing ratio (B=0.2 for 10 percent duty cycle and B=0.75 for 50 percent duty cycle); Re=25k
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Each figure includes a streamwise velocity (m/s) raster plot (y versus t) of wakes 5 and 6 over one VGJ pulse period (on the right) and a time history of jet exit velocity (with added time offset) and θdef (on the left); green lines indicate B=0 and B=2 limits; data for F+=0.012 (a), 0.031 (b), F+=0.12 (c), and 0.31 (d), 50 percent duty cycle, and mean B=0.75
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Each figure includes a streamwise velocity (m/s) raster plot (y versus t) of wakes 5 and 6 over one VGJ pulse period (on the right) and a time history of jet exit velocity (with added time offset) and θdef (on the left); green lines indicate B=0 & 2 limits; data for (a) F+=0.012, 4 percent duty cycle, and mean B=0.05 and (b) F+=0.031, 10 percent duty cycle, and mean B=0.2
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Boundary layer measurement stations on Blade 5
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Snapshots of flow over blade suction surface for F+=0.012 and 4 percent duty cycle (mean B=0.05); boundary layer profile positions indicated in Fig. 10; jet exit time history shown at top

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