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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

Sharma et al., 1998, private communication.
Matsunuma, T., Abe, H., Tsutsui, Y., and Murata, K., 1998, “Characteristics of an Annular Turbine Cascade at Low Reynolds Numbers,” ASME Paper No. 98-GT-518.
Matsunuma, T., Abe, H., and Tsutsui, Y., 1999, “Influence of Turbulence Intensity on Annular Turbine Stator Aerodynamics at Low Reynolds Num- bers,”ASME Paper No. 99-GT-151.
Helton, D., 1997, private communication.
Lin, J. C., Howard, F. G., Bushnell, D. M., and Selby, G. V., 1990, “Investigation of Several Passive and Active Methods of Turbulent Flow Separation Control,” AIAA Paper No. 90-1598.
Compton,  D. A., and Johnston,  J. P., 1992, “Streamwise Vortex Production by Pitched and Skewed Jets in a Turbulent Boundary Layer,” AIAA J. 30, No. 3, Mar.
Henry,  F. S., and Pearcey,  H. H., 1994, “Numerical Model of Boundary-Layer Control Using Air-Jet Generated Vortices,” AIAA J. 32, No. 12, Dec.
Hsiao,  F., Liu,  C., and Shyu,  J., 1990, “Control of Wall-Separated Flow by Internal Acoustic Excitation,” AIAA J. 28, No. 8, pp. 1440–1446.
Amitay, M., Kibens, V., Parekh, D., and Glezer, A., 1999, “The Dynamics of Flow Reattachment Over a Thick Airfoil Controlled by Synthetic Jet Actuators,” AIAA Paper No. 99-1001.
Weaver, D., McAlister, K., and Tso, J., 1998, “Suppression of Dynamic Stall by Steady and Pulsed Upper-Surface Blowing,” AIAA Paper No. 98-2413.
Wu,  J., Lu,  X., Denny,  A., Fan,  M., and Wu,  J., 1998, “Post-stall Flow Control on an Airfoil by Local Unsteady Forcing,” J. Fluid Mech., 371, pp. 21–58.
Seifert,  A., Bachar,  T., Koss,  D., Shepshelovich,  M., and Wygnanski,  I., 1993, “Oscillatory Blowing: A Tool to Delay Boundary-Layer Separation,” AIAA J., 31, No. 11, pp. 2052–2060.
Kwong,  A., and Dowling,  A., 1994, “Active Boundary-Layer Control in Diffusers,” AIAA J. 32, No. 12, Dec.
McManus, K., Legner, H., and Davis, S., 1994, “Pulsed Vortex Generator Jets for Active Control of Flow Separation,” AIAA Paper No. 94-2218.
Raghunathan, S., Watterson, J., Cooper, R., and Lee, S., 1999, “Short Wide Angle Diffuser With Pulse Jet Control,” AIAA Paper No. 99-0280.
Johari, H., and McManus, K., 1997, “Visualization of Pulsed Vortex Generator Jets for Active Control of Boundary Layer Separation,” AIAA Paper No. 97-2021.
Sondergaard, R., Bons, J., and Rivir, R., 2000, “Control of Low-Presure Turbine Separation Using Vortex Generator Jets,” submitted for publication in J. Propul. Power.
Bons, J., Sondergaard, R., and Rivir, R., 1999, “Control of Low-Pressure Turbine Separation Using Vortex Generator Jets,” AIAA Paper No. 99-0367.

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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