Journal ArticleDOI
Numerical study of blowing and suction control mechanism on NACA0012 airfoil
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In this paper, a jet with a width of 2.5% the chord length is placed on a NACA0012 airfoil upper surface simulating the blowing and suction control under Re = 5 × 10 5 and angle-of-attack 18-deg conditions.Abstract:
A jet with a width of 2.5% the chord length is placed on a NACA0012 airfoil’s upper surface simulating the blowing and suction control under Re =5 × 10 5 and angle-of-attack 18-deg conditions. Nearly 300 numerical simulations are conducted over a range of parameters (jet location, amplitude, and angle). The physical mechanisms that govern suction and blowing flow control are determined and analyzed, and the critical values of suction and blowing locations, amplitudes, and angles are discussed. The current successful large-scale numerical studies create a useful knowledge base for further exploration of multijet control system.read more
Citations
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Journal ArticleDOI
Performance of transition model for predicting low ReRe aerofoil flows without/with single and simultaneous blowing and suction
TL;DR: In this paper, the performance of transition and turbulence models is evaluated for predicting low R e number flows having laminar separation bubbles that are traditionally quite difficult to predict for RANS-based CFD methods.
Journal ArticleDOI
Application of flow control strategy of blowing, synthetic and plasma jet actuators in vertical axis wind turbines
TL;DR: In this paper, the upward-parabola blowing jet flow control strategy for VAWTs is proposed to suppress the flow separation in advance, which can significantly enhance the aerodynamic performance by using significantly low energy consumption.
Journal ArticleDOI
Numerical study of blowing and suction slot geometry optimization on NACA 0012 airfoil
TL;DR: In this article, the effects of jet width on blowing and suction flow control were evaluated for a NACA 0012 airfoil, and the results showed that when the blowing jet width increases, the lift-to-drag ratio rises continuously in tangential blowing and decreases quasi-linearly in perpendicular blowing.
Journal ArticleDOI
A direct numerical simulation investigation of the synthetic jet frequency effects on separation control of low-Re flow past an airfoil
Wei Zhang,Ravi Samtaney +1 more
TL;DR: In this paper, the authors present results of direct numerical simulations of a synthetic jet (SJ) based separation control of flow past a NACA-0018 (National Advisory Committee for Aeronautics) airfoil, at 10° angle of attack and Reynolds number 104 based on the air-foil chord length C and uniform inflow velocity U0.
Journal ArticleDOI
Three-dimensional suction flow control and suction jet length optimization of NACA 0012 wing
Kianoosh Yousefi,Reza Saleh +1 more
TL;DR: In this article, a three-dimensional suction flow control study was performed to investigate the aerodynamic characteristics of a rectangular wing with a NACA 0012 airfoil section, and the optimum suction jet length was determined.
References
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TL;DR: In this paper, two new two-equation eddy-viscosity turbulence models are presented, which combine different elements of existing models that are considered superior to their alternatives.
Journal ArticleDOI
The formation and evolution of synthetic jets
Barton L. Smith,Ari Glezer +1 more
TL;DR: In this article, a nominally plane turbulent jet is synthesized by the interactions of a train of counter-rotating vortex pairs that are formed at the edge of an orifice by the time-periodic motion of a flexible diaphragm in a sealed cavity.
ReportDOI
Aerodynamic characteristics of seven symmetrical airfoil sections through 180-degree angle of attack for use in aerodynamic analysis of vertical axis wind turbines
R E Sheldahl,P C Klimas +1 more
TL;DR: In this article, a wind tunnel test series was conducted at moderate values of Re in which 0 less than or equal to..cap alpha.. less than and equal to 180/sup 0/ force and moment data were obtained for four symmetrical blade-candidate airfoil sections (NACA-0009, -0012, −0012H, and -0015).
Turbulence Modeling Validation, Testing, and Development
TL;DR: In this paper, the authors provide accurate numerical solutions for selected flow fields and to compare and evaluate the performance of selected turbulence models with experimental results, including free shear flows, boundary layer flows, and axisymmetric shockwave/boundary layer interaction.
Airfoil section characteristics as affected by variations of the Reynolds number
Eastman N Jacobs,Albert Sherman +1 more
TL;DR: In this paper, the results of an investigation of a systematically chosen representative group of related airfoils conducted in the NACA variable-density wind tunnel over a wide range of Reynolds number extending well into the flight range are presented.