This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Narrow-Band Excitation of Vortex Flows
Technical Paper
2015-01-2572
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
At high angles of attack, the flow over a swept wing generates counter-rotating vortical features. These features can amplify into a nearly sinusoidal fluctuation of velocity components. The result is excitation of twin-fin buffeting, driven at clearly predictable frequencies, or at nearby lock-in frequencies of the fin structure. This is distinct from the traditional model of fin buffeting as a structural resonant response to broadband, large-amplitude excitation from vortex core bursting. Hot-film anemometry was conducted ahead of the vertical fins of a 1:48 scale model of the F-35B aircraft, in the angle of attack range between 18 and 30 degrees. Auto spectral density functions from these data showed a sharp spectral peak in the flow ahead of the fins for angles of attack between 20 and 28 degrees. Small fences placed on the top surface of the wing eliminated the spectral peak, leaving only a broadband turbulent spectrum. Spectra obtained at small yaw angles showed the same phenomeon. The paper sets these measurements in the context of prior work on the generation of Gortler vortices by the interaction of a conical vortex flow with a solid surface. Measurements over wings of several geometries were correlated to develop predictive relations based on wing sweep, flow speed, geometric scale and angle of attack.
Authors
Topic
Citation
Thorell, N., Motahari, N., and Komerath, N., "Narrow-Band Excitation of Vortex Flows," SAE Technical Paper 2015-01-2572, 2015, https://doi.org/10.4271/2015-01-2572.Also In
References
- Moses R. W. NASA Langley Research Center's Contributions To International Active Buffeting Alleviation Programs DTIC Document, Technical Report 2000
- Ozgoren M. , Sahin B. , and Rockwell D. Vortex Breakdown From A Pitching Delta Wing Incident Upon A Plate: Flow Structure As The Origin Of Buffet Loading Journal Of Fluids And Structures 16 3 295 316 2002
- Farokhi S. , Mauk C. S. , and Locke J. E. Stochastic Modeling Of Antisymmetric Buffet Loads On Horizontal Stabilizers In Massively Separated Flows DTIC Document, Technical Report 1996
- Farokhi S. , Mirsaan S. , Sherwood T. , and Ewing M. Prediction Of Antisymmetric Buffet Loads On Horizontal Stabilizers In Massively Separated Flows Phase II. DTIC Document, Technical Report 1999
- Gursul I. Interaction of Vortex Breakdown with Flexible Fin And Its Control, Phase-3 DTIC Document, Technical Report 2001
- Lambert C. and Gursul I. Characteristics Of Fin Buffeting Over Delta Wings Journal of Fluids And Structures 19 3 307 319 2004
- Sheta E. F. Prediction And Control Of Twin-Tail Buffet Of Fighter Aircraft CFD Research Corporation, DTIC Document 2002
- -- Buffet Alleviation Of F/A-18 Aircraft Using LEX Fences AIAA Paper 20031888 7 10 2003
- - Alleviation Of Vertical Tail Buffeting Of F/A-18 Aircraft Journal Of Aircraft 41 2 322 330 2004
- Wolfe S. Impingement Of A Streamwise Vortex From A Delta Wing On A Thin Plate: A Source Of Turbulent Buffeting Ph.D. Dissertation Lehigh University 1994
- Pototzky A. S. and Moses R. W. A Method To Analyze Tail Buffet Loads Of Aircraft RTO AVT Symposium On Flow- Induced Unsteady Loads And The Impact On Military Applications 2005 25 29
- Josyula E. and Gordnier R. E. Computational Simulation Of The F-22 Aircraft JournalOf Aircraft 36 3 614 616 1999
- Ashley H. , Rock S. , Digumarthi R. , and Chaney K. Further Study Of Active Control For Fin Buffet Alleviation, With Application To F-22 WL-TR-97-3073, Tech. Rep. July 1997
- Wray W. R. Jr F-22 Structural Coupling Lessons Learned, DTIC Document Technical Report 2000
- Moses R. W. and Huttsell L. Fin Buffeting Features Of An Early F-22 Model AIAA Paper, No. 2000-1695 2000
- Moses R. W. , Wieseman C. D. , Bent A. A. , and Pizzochero A. E. Evaluation Of New Actuators In A Buffet Loads Environment SPIE 8th Annual International Symposium On Smart Structures And Materials International Society For Optics And Photonics 2001 10 21
- Kandebo S. W. Investigators Scrutinizing F-22 Vertical Tall Buffet Aviation Week & Space Technology 156 18 2626 2002
- Wood N. J. , Michie S. , and Evans R. E. A Simple Technique For The Evaluation Of Buffet Excitation Parameter AIAA Paper 2003-1891 2003
- Black C. L. , Patel S. R. , and Anderson W. D. Low Speed Wind Tunnel Buffet Testing On The F/A-22 Journal Of Aircraft 43 4 879 885 2006
- Black C.L. , Patel S.R. , Zapata F. Buffet Fatigue Sequence Generation From F-22 Flight Test Data Using Frequency Domain Methods 48 th AIAA/ ASME/ASCE/ AHS/ASC Structures, Structural Dynamics And Materials Conference 2007
- Komerath N. , Liou S. , Schwartz R. , and Kim J. Flow Over A Twin-Tailed Aircraft At Angle Of Attack. I -Spatial Characteristics Journal of Aircraft 29 3 413 420
- Kwon O. J. and Sankar L. N. Viscous Flow Simulation Of A Fighter Aircraft Journal Of Aircraft 29 5 886 891 1992
- Triplett W. E. Pressure Measurements On Twin Vertical Tails In Buffeting Flow Journal of Aircraft 20 11 920 925 1983
- Colvin B. , Mullans R. , Paul R. , Roos H. F-15 Vertical Tail Vibration Investigations McDonnell-Douglas Corporation, MDC Report A6114 September 1979
- Lemay S. Experimental Investigation Of The F-15 AIAA Paper 94-0070, AIAA Aerospace Sciences Meeting Reno, NV January 1994
- Ashley H. , Rock S. M. , Digumarthi R. , Chaney K. , Eggers A. J. Jr Active Control For Fin Buffet Alleviation DTIC Document, Technical Report 1994
- Hauch R. , Jacobs J. , Dima C. , Ravindra K. Reduction Of Vertical Tail Buffet Response Using Active Control Journal of Aircraft 33 3 617 622 1996
- De Noyer M. P. B. Tail Buffet Alleviation Of High Performance Twin Tail Aircraft Using Offet Piezoceramic Stack Actuators And Acceleration Feedback Control Ph.D. Dissertation Georgia Institute Of Technology 1999
- Hanagud S. F-15 Tail Buffet Alleviation: A Smart Structure Approach DTIC Document, Tech. Rep. 1998
- Hanagud S. , De Noyer M. B. OffSet Piezoceramic Stack Actuators And Acceleration Feedback Control For Tail Buffet Alleviation Of A High Performance Twin Tail Aircraft: Robustness Issues DTIC Document, Technical Report 2001
- Ferman M. , Huttsell L. , Turner E. Experiments With Tangential Blowing To Reduce Buffet Response On An F-15 Model Journal Of Aircraft 41 4 903 910 2004
- Komerath N. M. , Hubner J. , Dixon C. Quasi-Periodicity In Vortex flows DTIC Document, Final Technical Report, Final Technical Rept Nov 92 Sep 95 October 1995
- Komerath N. , Schwartz R. , and Kim J. Flow Over A Twin-Tailed Aircraft At Angle Of Attack. II-Temporal Characteristics Journal of Aircraft 29 4 553 558 1992
- Komerath N. and Hubner J. Development Of Narrow-Band Velocity Fluctuations In Vortex Flows 26th AIAA Fluid Dynamics Conference, AIAA Paper No. 95-2304 San Diego, CA June 19 22 1995
- Hubner J. P. and Komerath N. M. Spectral Mapping Of Quasiperiodic Structures In A Vortex Flow Journal Of Aircraft 32 3 493 500 1995
- Hubner J. P. An Investigation Of Quasiperiodic Structures In The Vortical Flow Over A Delta Wing Configuration PhD Thesis Georgia Institute of Technology, School of Aerospace Engineering 1995
- Hubner J. and Komerath N. Counter-Rotating Structures Over A Delta Wing AIAA Journal 34 9 1958 1960 1996
- Klein M. and Komerath N. Reduction Of Narrow-Band Velocity Fluctuations Over An Aircraft Model AIAA Paper, No. 97-31740, 15th AIAA Applied Aerodynamics Conference Atlanta, GA June 23 25 1997
- Zhang Q. and Ye Z.-Y. Novel Method Based On Inflatable Bump For Vertical Tail Buffeting Suppression Journal of Aircraft 1 5 2014
- Kumar , V. , Hiremath , N. , Shukla , D. , Thorell , N. , Komerath , N. Control of Centrifugal Instability in Vortex-Surface Interaction Paper IMECE2015-52306, Proceedings of the International Mechanical Engineering Congress & Exposition November 2015 Houston, USA