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Mean Flow and Pressure in a Straight Suction Duct with Deflected Inflow

Published online by Cambridge University Press:  07 June 2016

F M Burrows
F M Burrows*
Affiliation:
University College of North Wales, Bangor
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Summary

The momentum analysis of the mean flow of an incompressible fluid in a straight suction duct with porous walls dealt with in a previous paper is extended to account for deflection of the inflow towards a direction parallel with the axis of the duct. Ducts with a continuous distribution of porosity and ducts with a relatively small number of rather large ports are considered and the results are applicable to regions where the velocity and pressure can be assumed to be distributed uniformly across planes normal to the mean flow inside them. Some measurements made with a one-quarter full-size scale model of the straight and more or less regularly obstructed suction duct used in the boundary layer control system of a high-lift research aircraft show that at least part of the theory permits a reasonable prediction of pressures.

Type
Research Article
Information
Aeronautical Quarterly , Volume 23 , Issue 3 , August 1972 , pp. 238 - 252
Copyright
Copyright © Royal Aeronautical Society. 1972

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References

1. Burrows, F M Mean now and pressure in a straight suction duct with porous walls. Aeronautical Quarterly, Vol XXI, p 101, May 1970.Google Scholar
2. Head, M R Clark, D G Flight experiments on suction for high lift. Journal of Aircraft, Vol 4, No 2, pp 81-89, March/April 1967.CrossRefGoogle Scholar
3. Burrows, F M On some problems concerning high lift suction aircraft. PhD dissertation, University of Cambridge, 1961.Google Scholar
4. Hoerner, S F Fluid-dynamic Drag. Hoerner, New York, 1958.Google Scholar
5. Preston, J H The three-quarter radius pitot-tube flowmeter. The Engineer, Vol 190, p 400, 1950.Google Scholar