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AUTHOR(S):

Mehdi.Banafi, Mehrdad.Banafi

 

TITLE

An Experimental research on wake behind airfoil Naca0012 under various angles

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ABSTRACT

The aim of this article is investigation of the wake of an airfoil Naca0012 in the wind tunnel. The measurement has been done at different angles of attach of airfoil α= 0, 5, 10, 15 degrees and locate in test section of wind tunnel a turbulence maker net with intensity of 5% in the entrance of test section. The wind tunnel which is used in this experimental has area section of 1600 mm2 and 2000 mm length; with minimum free turbulence level less than 0.1% without any net and maximum speed is 30 m/s. For measuring favorite parameters in this test we apply hot wire anemometer, In this paper we focus on wake turbulence behind the airfoil in the angles of 0,5,10,15 degrees and in X/C=0,0.05,0.01,0.15,0.2(that X means distance behind airfoil and C means airfoil thickness). To comparison data wake results in a certain degree for various stations. On the other hand, in certain stations for various degrees, we tried our test in 20m/s velocity. From the diagram at the certain angles can conclude that on the certain angle whatever approach to the farther stations we have increasing on velocity and diagram goes to flatten. We can conclude from diagram at certain stations with increasing in angle the velocity is decrease. Also with increasing in angle the diagram of velocity shifts toward negative and with increasing of airfoil angle from station x/c = 0.5 to the next velocity defect increases

KEYWORDS

Wake- Experimental- wind tunnel- hot wire- airfoil Naca0012

REFERENCES

[1] Yachen Li, Jinjun Wang and Panfeng Zhang, Effects of Gurney Flaps on a Naca0012 Airfoil, Flow, Turbulence and Combustion 68: 27–39, 2002.

[2] Dalibar Dvorak, Effects of angle of attack profiles in flapping foil propulsion, Journal of fluid and structures, 2004.

[3] Andre Luiz Amarante Mesquita, Experimental analysis or airfoil high of attack, Revista Virtural de Iniciação Acadêmica da UFPA, Julho, 2001.

[4] Ph. Devinant, T. Laverne, J. Hureau, Experimental study of wind-turbine airfoil aerodynamics in high turbulence, Journal of Wind Engineering and Industrial Aerodynamics 90,2002,pp. 689–707.

[5] Lasse Gilling , Niels N. Sørensen, Lars Davidson, Detached Eddy Simulations of an Airfoil in Turbulent Inflow, 47th AIAA Aerospace Sciences Meeting Including The New Horizons Forum and Aerospace Exposition 5 - 8 January 2009, Orlando, Florida.

[6] G. Martinat_, M.Braza, Y.Hoarau, G.Harran, Turbulence modelling of the flow past a pitching NACA0012 airfoil at105 and 106 Reynolds numbers, Journal of Fluids and Structures24,2008,pp.1294–1303.

[7] Zhou Y, Md. Mahbub Alam, Yang H.X, Guo H, Wood D.H, Fluid forces on a very low Reynolds number airfoil and their prediction, International Journal of Heat and Fluid Flow, 2010.

[8] J. Soria, T.H. New, T.T. Lim, K. Parker, Multigrid CCDPIV measurements of accelerated flow past an airfoil at an angle of attack of 30, Experimental Thermal and Fluid Science 27, 2003, pp. 667–676.

[9] F.S. Hover, Φ. Haugsdal, M.S. Triantafyllou, Effect of angle of attack profiles in flapping foil propulsion, Journal of Fluids and Structures 19, 2004, pp. 37–47.

[10] T. K. Sengupta, S. DE, K. Gupta, Effect of free-stream turbulence on flow over aerofoil section at high incidence, Journal of Fluids and Structures, 2000.1) 00, 000}000

[11] Qiang Zhang, Phillip M. Ligran, Wake Turbulence Structure Downstream of a Cambered Airfoil in Transonic Flow: Effects of Surface Roughness and Freestream Turbulence Intensity, International Journal of Rotating Machinery, 2006, pp. 1–12.

Cite this paper

Mehdi.Banafi, Mehrdad.Banafi. (2017) An Experimental research on wake behind airfoil Naca0012 under various angles. International Journal of Theoretical and Applied Mechanics, 2, 164-169

 

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