EFFECTS OF VARIOUS PARAMETERS ON DYNAMIC STALL BEHAVIOR AND AERODYNAMIC COEFFICIENTS OF A NACA0012 AIRFOIL

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ABDIZADEH GHOLAM REZA; AHMADVAND HAMID; JAFARI MOHAMMAD MEHDI

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Journal: Modares Mechanical Engineering Year:2017 | Volume:17 | Issue:4 Page(s): 359-368

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Title

EFFECTS OF VARIOUS PARAMETERS ON DYNAMIC STALL BEHAVIOR AND AERODYNAMIC COEFFICIENTS OF A NACA0012 AIRFOIL

Author(s)

ABDIZADEH GHOLAM REZA | AHMADVAND HAMID | JAFARI MOHAMMAD MEHDI | Issue Writer Certificate

Keywords

OSCILLATING AIRFOILQ2

DYNAMIC STALLQ1

FLOW STRUCTUREQ1

VORTEXQ2

Abstract

Dynamic stall behavior of a NACA0012 airfoil undergoing pitching motion has been studied by a numerical approach. The turbulence intensity, oscillation frequency and amplitude and the Reynolds number were found to be the major contributors in DYNAMIC STALL. The flow field structure and the associated vortices for this airfoil as well as the impact of the oscillation frequency on aerodynamic efficiency were also studied. The simulations were two dimensional and the k-w SST turbulence model was utilized for the present analysis. The results show that increasing the oscillation frequency and amplitude and the turbulence intensity, postpones the DYNAMIC STALL to higher angles of attack.Furthermore, as the Reynolds number is increased, both the lift coefficient and the width of the associated hysteresis loop decrease. The airfoil aerodynamic efficiency variation with oscillation frequency has been shown to have a maximum point for all angles of attack considered. The flow field structure revealed that the main cause of the DYNAMIC STALL is a series of low pressure vortices formed at the leading edge which shed into downstream and separate from the surface. A secondary VORTEX will then appear and increase the lift coefficient dramatically. The present simulation results are in a good agreement with those found in the literature.

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APA: Copy

ABDIZADEH, GHOLAM REZA, AHMADVAND, HAMID, & JAFARI, MOHAMMAD MEHDI. (2017). EFFECTS OF VARIOUS PARAMETERS ON DYNAMIC STALL BEHAVIOR AND AERODYNAMIC COEFFICIENTS OF A NACA0012 AIRFOIL. MODARES MECHANICAL ENGINEERING, 17(4 ), 359-368. SID. https://sid.ir/paper/178869/en

Vancouver: Copy

ABDIZADEH GHOLAM REZA, AHMADVAND HAMID, JAFARI MOHAMMAD MEHDI. EFFECTS OF VARIOUS PARAMETERS ON DYNAMIC STALL BEHAVIOR AND AERODYNAMIC COEFFICIENTS OF A NACA0012 AIRFOIL. MODARES MECHANICAL ENGINEERING[Internet]. 2017;17(4 ):359-368. Available from: https://sid.ir/paper/178869/en

IEEE: Copy

GHOLAM REZA ABDIZADEH, HAMID AHMADVAND, and MOHAMMAD MEHDI JAFARI, “EFFECTS OF VARIOUS PARAMETERS ON DYNAMIC STALL BEHAVIOR AND AERODYNAMIC COEFFICIENTS OF A NACA0012 AIRFOIL,” MODARES MECHANICAL ENGINEERING, vol. 17, no. 4 , pp. 359–368, 2017, [Online]. Available: https://sid.ir/paper/178869/en

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