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Velocities Induced by The Vortex Wake of a Propeller in a Duct

Published online by Cambridge University Press:  04 July 2016

Robert Hickling
Robert Hickling*
Affiliation:
General Motors Research Laboratories, Warren, Michigan
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Extract

If it is assumed that the effect of radial flow can be neglected, then the vortices which are shed from the trailing edge of a propeller blade can be said to lie approximately on helical lines. These vortices form a vortex sheet which for practical purposes is assumed to extend unaltered downstream to infinity. If the propeller blade is approximated by a lifting-line of bound vorticity, then the velocities at the blade induced by the trailing vortex system can be derived from the simple flow conditions in the hypothetical far wake where the vortex sheets extend equally to infinity in both directions. Results are already well-known for the case where the vortex sheets exist in free space. It is the purpose here to examine the effect of adjacent boundaries, such as the hub and the duct wall of a ducted propeller. The results also relate to a test propeller in a tunnel.

Type
Technical Notes
Information
The Aeronautical Journal , Volume 67 , Issue 635 , November 1963 , pp. 731 - 733
Copyright
Copyright © Royal Aeronautical Society 1963

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References

1.Lerbs, H. W.Moderately Loaded Propellers with a Finite Number of Blades and an Arbitrary Distribution of Circulation. Proc. Soc. Nav. Arch, and Marine Eng. (New York), November 1952.Google Scholar
2.Siestrunck, R. and Fabri, J.Comptes Rendus. Acad. Sci., Vol. 226, p. 1430, 1948.Google Scholar
3.Busemann, A. Theory of the Propeller in Compressible Flow. Third Mid-Western Conference on Fluid Mechanics (Minneapolis), March 1953.Google Scholar