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Low Reynolds Number Laminar Separation Bubble Control Using a Backward Facing Step
ISSN: 0148-7191, e-ISSN: 2688-3627
Published September 01, 1993 by SAE International in United States
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A backward facing step is used to increase the lift to drag ratio of an airfoil with a separation bubble. Three airfoils are tested leading to the conclusion that the step works better for airfoils that have large separation bubbles near the mid-chord. It does not work well for separation bubbles near the leading edge, but has a positive effect for a separation bubble closerto the trailing edge. Results are preliminary and indicate that research is needed to characterize the size and location of the step, as well as the effect of freestream turbulence and Reynolds number.
CitationRodriguez, J. and Rothan, D., "Low Reynolds Number Laminar Separation Bubble Control Using a Backward Facing Step," SAE Technical Paper 932572, 1993, https://doi.org/10.4271/932572.
- Liebeck R.H. “Laminar Separation Bubbles and Airfoil Design at Low Reynolds Numbers” paper AIAA-92-2735-CP 10th AIAA Applied Aerodynamics Conference 1992
- Gad-el-Hak M. “Control of Low-Speed Airfoil Aerodynamics” AIAA Journal 28 9 September 1990
- Kerho M. Hutcherson S. Blackwelder R.F. Liebeck R.H. “Vortex Generators Used to Control Laminar Separation Bubbles” J. of Aircraft 30 3 May 1993
- Bradshaw P. Wong F.Y.F. “The reattachment and relaxation of a turbulent shear layer” J. of Fluid Mechanics 52 1972
- Adams E.W. Johnston J.P. “Effects of the separating shear layer on the reattachment flow structure. Part:2 Reattachment length and wall shear stress” Experiments in Fluids 6 1988
- Drela M. “XFOIL: An Analysis and Design System for Low Reynolds Number Airfoils” Low Reynolds Number Aerodynamics, Notes in Eng 54 1989
- Pfenninger W. Vemeru C.S. “Design of Low Reynolds Number Airfoils-I” paper AIAA 88-2572 6th AIAA Applied Aerodynamics Conference June 1988
- Rothan D. “Low Reynolds Number Laminar Separation Bubble Control Using A Backward Facing Step” M.S. Thesis, Embry-Riddle Aeronautical University April 1993
- Drela G. Giles M.B. “Viscous-lnviscid Analysis of Transonic and Low Reynolds Number Airfoils” AIAA Journal 25 10 October 1987
- Evangelista R. McGhee R.J. Walker B.S. “Correlation of Theory to Wind-Tunnel Data at Reynolds Numbers Below 500,000” Low Reynolds Number Aerodynamics, Notes in Eng 54 1989
- Liebeck R.H. “Low Reynolds Number Airfoil Design For Subsonic Compressible Flow” Low Reynolds Number Aerodynamics, Notes in Eng 54 1989
- Siddiqi S. Kwa T-S “The Design and Testing of a Long Endurance RPV” Proc. of the Intl. Council of Aeronautical Sciences, Stockholm, Sweden September 1990
- Pfenninger W. Vemeru C.S. Chandra S. “Optimization of Natural Laminar Flow Airfoils for High Section Lift to Drag Ratios in the Lower Reynolds Number Range” AIAA Paper 89-0539 1989
- McGhee R.J. Walker B.S. “Performance Measurements of an Airfoil at Low Reynolds Numbers” Low Reynolds Number Aerodynamics, Notes in Eng 54 1989