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Forward Facing Flap for Delta Wing Performance Improvement

Noor Ahmed(1*)

(1) Department of Mechanical Engineering Science, Johannesburg University, South Africa
(*) Corresponding author



In the present study, the concept of forward facing flap mounted on a slender delta wing, originally proposed by Hurley is considered. The test model resulted in surfaces that deflected from the basic delta to form a simple X-configuration. With this configuration, force balance measurements were conducted at low speed in a low speed open circuit wind tunnel. The lift produced was found to be dependent on both the flap deflection angle and thickness. Overall, the results obtained are very promising as they show definitive trends in the lift performance improvement of the X-configuration over conventional base delta wing at low angles of attack.
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Delta Wing; Vortical Flow; Forward Facing Flap

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Aziz, M., Elsayed, A., CFD Investigations for UAV and MAV Low Speed Airfoils Characteristics, (2015) International Review of Aerospace Engineering (IREASE), 8 (3), pp. 95-100.

Tebbal, A., Saidi, F., Noureddine, B., Imine, B., Hamoudi, B., Numerical Study of the Roughness Influence on NACA 63-430 Profile Aerodynamic Performance, (2016) International Review of Mechanical Engineering (IREME), 10 (4), pp. 231-238.

Sharma, D., Poddar, K., Muthukumar, A., Reddy, K., Effect of Boundary Layer Mixing Devices on Hysteresis Behavior of Flow Past a Pitching Airfoil, (2015) International Journal on Engineering Applications (IREA), 3 (1), pp. 14-20.

Bekka, N., Bessaïh, R., Sellam, M., Numerical Study of Transonic Flows Using Various Turbulence Models, (2015) International Review of Aerospace Engineering (IREASE), 8 (6), pp. 216-224.

Kumaravel, G., Jeyajothiraj, P., Rathakrishnan, E., Transonic Shock Wave Patterns Over an Airfoil in an Accelerated Flow, (2015) International Review of Aerospace Engineering (IREASE), 8 (2), pp. 56-70.

Al-Garni, A., Kassem, A., Abdallah, A., Aerodynamic-Shape Optimization of Supersonic-Missiles Using Monte-Carlo, (2016) International Journal on Engineering Applications (IREA), 4 (1), pp. 7-15.

Defromont, T., Rathakrishnan, E., Supersonic Jet Control with Air-Tabs, (2016) International Review of Aerospace Engineering (IREASE), 9 (2), pp. 37-42.

Y.Y.Zheng, N.A.Ahmed and W.Zhang,, ‘Impact Analysis of Varying Strength Counter-flow Jet Ejection on a Blunt Shaped Body in A Supersonic Flow’, Advances and Applications in Fluid Mechanics, vol 12, no.2, pp 119-129, (2012)

Houghton, E.L. and Carpenter, P.W., ‘Aerodynamics for Engineering Students’, Butterworth-Heinemann, (2017)

Nazari, A., Ahmed, S., Separation Control by Using Rotating Cylinders, (2017) International Review of Mechanical Engineering (IREME), 11 (1), pp. 10-15.

N.A.Ahmed, and R.D.Archer, ‘Performance Improvement of a Bi-plane with Endplates’, AIAA Journal of Aircraft, vol.38, no.2, pp 398-400, March-April, (2001)

N.A.Ahmed, and R.D.Archer, ‘Post-Stall Behaviour of A Wing under Externally Imposed Sound’, AIAA Journal of Aircraft, vol 38, no.5, pp961-963, (2001)

R.G.Simpson, N.A.Ahmed and R.D.Archer, (2002), ‘Near Field Study of Vortex Attenuation using Wing Tip Blowing’, The Aeronautical Journal of the Royal Aeronautical Society, vol. 102, pp117-120, (2002)

R.G.Simpson, N.A.Ahmed and R.D.Archer, ‘Improvement of a Wing Performance using Coanda Tip Jets’, AIAA Journal of Aircraft, vol 37, no 1, pp183-184, (2001)

Aloui, F., Kourta, A., Ben Nasrallah, S., Experimental Study of Synthetic Jets with Cross Flow in Boundary Layer, (2016) International Review of Aerospace Engineering (IREASE), 9 (1), pp. 13-21.

P. Arun Kumar, S. B. Verma, E. Rathakrishnan. (2015) Experimental Study of Subsonic and Sonic Jets Controlled by Air Tabs. Journal of Propulsion and Power 31:5, 1473-1481.

Marchman, J. F., ‘Aerodynamics of inverted leading-edge flaps on delta wings’, Journal of Aircraft, vol. 18, no. 12, Dec., pp. 1051-1056, (1981)

Rao, D. M. and Johnson, T. D., ‘Investigation of delta wing leading-edge devices’, Journal of Aircraft, vol. 18, no. 3, March, pp. 161-167, (1996)

Hurley, D. G., ‘The use of boundary layer control to establish free stream-line flows’, in Lachmann, G. V., Boundary Layer and Flow Control Volume 1, Pergamon Press, pp. 295-341, (1961)

A.Pissasale and N.A.Ahmed, ‘Development of a functional relationship between port pressures and flow properties for the calibration and application of multi-hole probes to highly three-dimensional flows’, Experiments in Fluids, vol 36, no.3, March, pp 422-436, (2004)

N.A.Ahmed and D.J.Wagner, “Vortex shedding and transition frequencies associated with flow around a circular cylinder”, AIAA Journal, vol. 41, no.3, March, 2003,, pp 542-544, (2003)

Adebayo, D., Rona, A., PIV Study of the Flow Across the Meridional Plane of Rotating Cylinders with Wide Gap, (2015) International Review of Aerospace Engineering (IREASE), 8 (1), pp. 26-34.


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