This article explores, theoretically and experimentally, Coanda effect and upper surface blowing over an annular wing. Also, presented are a simple mathematical/empirical model and an experimental strategy to evaluate lift generated by a blown-annular wing. It has been shown that the wing is capable of deflecting the flow by ∼90° with an efficiency of ∼61 per cent with reference to the undeflected horizontal thrust from the source. The analytical review and experimental data presented will enable an aircraft designer to deduce this particular powered-lift system for V/STOL applications at the preliminary design stage.
SaeedB.GrattonG.Exploring the aerodynamic characteristics of a blown annular wing for vertical/short take-off and landing applications. Proc. IMechE, Part G: J. Aerospace Engineering, 2011, 225(6), 689–707.
CoandaH.Device for deflecting a stream of elastic fluid projected into an elastic fluid. US Patent No. 2,052,869, USA, 1936.
5.
Yen, K. T. An analysis of the flow turning characteristics of upper surface blowing devices for STOL aircraft. Report no. NADC-82007-60, Naval Air Development Centre, 1982.
Raymond, D. V. Wind tunnel investigation of internally blown jet flap STOL airplane mode. NASA TN-D-8309, Langley Research Laboratory Centre, 1976.
8.
William, J., Buttler, S. F. J., and Wood, M. N. The aerodynamics of jet flaps. Aeronautical research council reports and memoranda, R.&M. No. 3304, Aeronautical Engineering, University of Cranfield, 1963.
9.
SpenceD. A.The lift coefficient of a thin, jet-flapped wing. Proc. R. Soc. Lond. Series A Math. Phys. Sci., 1956, 238(1212), 46–68.
10.
Phelps, A. E. and Smith, C. C. Wind-tunnel investigation of an upper surface blown jet-flap powered-lift configuration. NASA technical note, NASA TND-7399, NASA Ames Research Center, December 1973.
11.
Phelps, A. E. III, Johnson, J. L, Jr. and Margason, R.J. Summary of low-speed aerodynamic characteristics of upper-surface-blown jet-flap configurations. NASA technical note, NASA 406, NASA Ames Research Center, May 1976, pp. 63–87.
12.
Sleenman, W. C., Jr. and Hohlweg, W. Low-speed wind-tunnel investigation of a four-engine upper surface blown model having a swept wing and rectangular and D-shaped exhaust nozzles. NASA technical note, NASA TND-8061, NASA Ames Research Center, December 1975.
13.
HendersonC.WaltersM.High-lift STOL aerodynamics/stability and control techniques assessment. NASA technical note, report no. 81261-60, Naval Air Development Centre, March 1983.
14.
NewmanB. G.The deflexion of plane jets by adjacent boundaries– Coanda effect. In: LachmannG. V. (ed.) Boundary layer and flow control, 1961, Vol. 1, Oxford: Pergamon Press, pp. 232–264.
15.
FeketeG. I.Coanda flow of a two-dimensional wall jet on the outside of a circular cylinder. technical report no. 63-11, Mechanical Engineering Research Laboratories, McGill University, 1963.
16.
JuvetP. J. D.Control of high Reynolds number round jets. PhD Thesis, Department of Mechanical Engineering, Stanford University, 1993.
17.
Roberts, D. W. A zonal method for modeling powered-lift aircraft flow fields. NASA technical note, NASA CR-177521, NASA Ames Research Center, March 1989.
18.
GreenP. N.CarpenterP. W.The aeroacoustics and aerodynamics of high-speed Coanda devices, Part I: Conventional arrangement of exit nozzle and surface. J. Sound Vibration, 1997, 208, 777–801.
19.
GlauertM. B.The wall jet. J. Fluid Mech., 1956, 1(6), 625–643.
20.
RobertsL.A theory of turbulent curved wall jets. In Proceedings of the Circulation Control Workshop. AMES Research Center, Moffett Field, California, 99–11219–21 February 1986.
21.
Rodman, L. C., Wood, N. J., and Roberts, L. Experimental investigation of straight and curved annular wall jets. AIAA J., 1989, 27(8), 1059–1067.
22.
Proceedings of the Circulation-Control Workshop 1986. February 1986, NASA Ames Research Center, Moffett Field, California, 19–21.
23.
AbbottI. H.DoenhoffA. E.Theory of wing sections, New York: Dover Publications, Inc., 1959.
24.
iLoad Digital USB Integrated Load Sensor, Spec Sheet, Load Star Sensor, Inc., available form www.loadstarsensors.com (accessed 28 December 2008).
25.
Hot-wire anemometry spec sheet, available from www.dantecdynamics.com (accessed 20 October 2008).
26.
AsbergB.BlancoG.BoseP.Garcia-LopezJ.OvermarsM.WilfongG.ZhuB.Feasibility of design in stereolithography. Algorithmica. Special Issue on Computational geometry in manufacturing, 1997, 19(1/2), 61–83.
