We have studied the influence of a tangential blowing jet in dynamic stall of a NACA0012 airfoil at Reynolds number of 1 × 106, for active flow control (AFC) purposes. The airfoil was oscillating between angles of attack (AOA) of 5 and 25 deg about its quarter-chord with a sinusoidal motion. We have utilized computational fluid dynamics to investigate the impact of jet location and jet velocity ratio on the aerodynamic coefficients. We have placed the jet location upstream of the counter-clockwise (CCW) vortex which was formed during the upstroke motion near the leading-edge; we have also considered several other locations nearby to perform sensitivity analysis. Our results showed that placing the jet slot within a very small range upstream of the CCW vortex had tremendous effects on both lift and drag, such that maximum drag was reduced by 80%. There was another unique observation: placing the jet at separation point led to an inverse behavior of drag hysteresis curve in upstroke and downstroke motions. Drag in downstroke motion was significantly lower than upstroke motion, whereas in uncontrolled case the converse was true. Lift was significantly enhanced during both upstroke and downstroke motions. By investigating the pressure coefficients, it was found that flow control had altered the distribution of pressure over the airfoil upper surface. It caused a reduction in pressure difference between upper and lower surfaces in the rear part, while substantially increased pressure difference in the front part of the airfoil.
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January 2018
Research-Article
Active Flow Control of Dynamic Stall by Means of Continuous Jet Flow at Reynolds Number of 1 × 106
Mehran Tadjfar,
Mehran Tadjfar
Mem. ASME
Turbulence Laboratory,
Department of Aerospace Engineering,
Amirkabir University of Technology,
Tehran 15916-34312, Iran
e-mail: mtadjfar@aut.ac.ir
Turbulence Laboratory,
Department of Aerospace Engineering,
Amirkabir University of Technology,
Tehran 15916-34312, Iran
e-mail: mtadjfar@aut.ac.ir
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Ehsan Asgari
Ehsan Asgari
Turbulence Laboratory,
Department of Aerospace Engineering,
Amirkabir University of Technology,
Tehran 15916-34312, Iran
e-mail: e.asgari@aut.ac.ir
Department of Aerospace Engineering,
Amirkabir University of Technology,
Tehran 15916-34312, Iran
e-mail: e.asgari@aut.ac.ir
Search for other works by this author on:
Mehran Tadjfar
Mem. ASME
Turbulence Laboratory,
Department of Aerospace Engineering,
Amirkabir University of Technology,
Tehran 15916-34312, Iran
e-mail: mtadjfar@aut.ac.ir
Turbulence Laboratory,
Department of Aerospace Engineering,
Amirkabir University of Technology,
Tehran 15916-34312, Iran
e-mail: mtadjfar@aut.ac.ir
Ehsan Asgari
Turbulence Laboratory,
Department of Aerospace Engineering,
Amirkabir University of Technology,
Tehran 15916-34312, Iran
e-mail: e.asgari@aut.ac.ir
Department of Aerospace Engineering,
Amirkabir University of Technology,
Tehran 15916-34312, Iran
e-mail: e.asgari@aut.ac.ir
1Corresponding author.
Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received April 30, 2017; final manuscript received August 8, 2017; published online October 4, 2017. Assoc. Editor: Moran Wang.
J. Fluids Eng. Jan 2018, 140(1): 011107 (10 pages)
Published Online: October 4, 2017
Article history
Received:
April 30, 2017
Revised:
August 8, 2017
Citation
Tadjfar, M., and Asgari, E. (October 4, 2017). "Active Flow Control of Dynamic Stall by Means of Continuous Jet Flow at Reynolds Number of 1 × 106." ASME. J. Fluids Eng. January 2018; 140(1): 011107. https://doi.org/10.1115/1.4037841
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