A ducted propeller is a propulsion device
consisting of a conventional open propeller surrounded by a duct
or nozzle. Ducted propellers find extensive applications in both
marine and aeronautical fields. The duct surrounding the
propeller may be used either to accelerate or to decelerate the
flow in the propeller plane. In marine applications the flow
accelerating duct is known as the "Kort Nozzle" and the
flow decelerating device is generally referred as the
The concept of surrounding the propeller by a
shroud is very old. Kort Nozzle ducted propellers have been
widely used in tugboats and trawelers where the propeller is
small and heavily loaded. The advantage of using a ducted
propeller for these vessels is that the flow is accelerated and
thus an improvement in propulsive efficiency is obtained In
addition the duct shares a fair proportion of the thrust and
thereby reduces the propeller loading. The flow accelerating
pump-jets find considerable applications for the propulsion of
submarines and torpedoes since the lower velocity in the
propeller plane helps to delay the cavitation induced noise. The
duct itself however will produce a negative thrust.
|Vortex Element Method -
Iterative - V. Balabaskaran
Comparison of measured
and predicted duct thrusts
Aerodynamic studies of a Kort Nozzle Ducted
BIBILIOGRAPHY ON DUCTED PROPELLERS
Bagley. J.A., Kirbyr N.B., Mareer, P.J.'A Method Calculating the Velocity Distribution on Annular Aerofoils in incompressible flow, 'ARC Technical Report, R and M No. 3146 (1961).
V. Balabaskaran, 'Aerodynamic Investigations of a Ducted Propeller', Ph.D. Thesis, Department of Mechanical Engineering, IIT, Madras, India (1982)
Young, C., 'An Investigation of Annular Aerofoils for Turbofan Engine cowls,' RAE Technical Report 69285 (1969).
Lewis. R.I., 'Ducted Propeller Propulsion Systems,' Internal Report Tb 15, Department of Mechanical Engineering University of Newcastle Upon Tyne (1971).
Lewis, R.I., 'Fluid Dynamic Design and Performance Analysis of Ducted Propellers,' Trans. Of North East Coast Institution of Engineers and Shipbuilders. Vol.88 (1972).
Sacks. A.H., Burnell. J.A., 'Ducted Propellers - A Critical Review of the state of Art'. Progress in Aeronautical Sciences. Vol-3 (1962), pp 85-135, Pergamon Press.
Weissinger. J., Maass, D., 'Theory of Ducted Propellers - A Review,' 7th Symposium on Naval Hydrodynamics, Rome. (August 1968) Office of Naval Research, Department of U.S. Navy.
Morgan, W.B., Caster. E.B. 'Comparison of Theory and Experiment on Ducted Propellers,' 7th Symposium on Naval Hydrodynamics. Rome,(August 1968), Office of Naval Research Department of U.S. Navy.
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Kuchemann., D., Weber, J., 'Aerodynamics of Propulsion,' Mc Graw Hill Publishing Co. Ltd. London (1957).
Hess, J.L. and Smith, A.M.0., 'Calculation of Potential Flow about Bodies., Progress ' Aeronautical Sciences, Vol.8 (1967) pp 1-138.
Lewis, R.I., Ryan, P.G., 'Surface Vorticity Theory for Axi-symmetric Potential Flow Past Annular Aerofoils and Bodies of Revolution with Application to Ducted Propellers and Cowls ' Jour. Mech.Engg. Sci., Vol.14p No.4 (1972). Ryan, P.G., Glover, E.J., 'A Ducted Propeller Design Method: A New Approach Using Surface Vorticity Distribution Techniques and Lifting Line Theory,' Trans. RINA, Vol.144, (1972).
Gibson, I.S., Lewis, R.I., 'Ducted Propeller Analysis by Surface Vorticity and actuator disc theory', RINA Symposium on Ducted Propellers, Paper No. 1 (1973)
Glover, E.J., 'Design Method for the heavily Loaded Marine Propeller' Trans. RINA, Vol. 116 (1974).
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Van Manen, J.D., 'Effect of Radial Load Distribution on the Performance of Shrouded Propellers,' Int. Shipb. Progress. V01.9, No.93 (May 1962) pp 185-196.
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Emersen, A. Sinclair, L., 'Experimental and Practical considerations in the design of a Ducted Propeller System,' RINA Symposium on Ducted Propellers (1973).
Lewis. R.I.. 'Turbomachinery Fluid Dynamic Problems and Techniques - A Review of some Recent Research,' Keynote Address,, Eighth National Conference on Fluid Mechanics and Fluid Power, Coimbatore,, InIia (1978).
Ryan, P.G., 'Surface Vorticity Distribution Techniques Applied to Ducted Propeller Flows', Ph.D. Thesis, Dept of Mech. Engg., University of Newcastle Upon Tyne (November 1970).
Lewis R.I., 'A Theory for Prediction of the Off Design Performance of Kort Nozzle Ducted Propellers,' Internal Report No. Tb 219 Department of Mechanical Engineering, University of Newcastle Upon Tyne (August 19i2).
Gibson, I.S.,'Application of Vortex Singularities to Ducted Propellers,' Ph.D. Thesis, Newcastle Upon Tyne (October 1972).
Oosterveld, M.W.C., 'Wake adapted Ducted Propeller,' Publication No 345, Netherlands Ship Model Basin, Wageningen (June 1970).
Jacobson, G.N., Discussions on the paper 'Experimental and Practical Considerations in the Design of a Ducted Propeller System', RINA Symposium on Ducted Propellers', Paper No.2, (1973).
Turbalt V.K., 'Theoretical Solution of the Problem on the Action of a Non-axisymmetrical Ducted Propeller System in a Non-Uniform Flow,,' RINA m.posium on Ducted Propellers, Paper No.2 (1973).
Hill, V.P., 'Surface Vorticity Theory for Propeller Ducts and Turbofan Engine Cowls in Non-Axisymmetric ':Incompressible Flow,' Jour. Mech.Engg.Sci, I.Mech.E. Vol.20, No.4 (1978) pp 201-217.
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Updated on 11 Sep 2001