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Performance of a Diffuser with Fully-Developed Pipe Flow at Entry

Published online by Cambridge University Press:  04 July 2016

P. Bradshaw
P. Bradshaw*
Affiliation:
National Physical Laboratory, Teddington, Middlesex
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Extract

Cockrell and Markland have found that the static-pressure recovery coefficient of a conical diffuser, which is well known to decrease as the (turbulent) boundary layer thickness at entry increases, actually rises again when the inlet boundary layer is so thick as to approximate to fully-developed pipe flow. It may be noted that this is not a consequence of the definition of the pressure coefficient because, for typical pipe flow velocity profiles, the pressure coefficient based on mean velocity, , is very nearly the same as that based on momentum flux .

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

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References

1.Cockrell, D. J. and Markland, E.The Effects of Inlet Conditions on Incompressible Fluid Flow Through Conical Diffusers. Journal of the Royal Aeronautical Society, Vol. 66, p. 51, January 1962.Google Scholar
2.Reid, J. The Effects of a Cylindrical Shroud on the Performance of a Stationary Convergent Nozzle. ARC R & M 3320, 1963.Google Scholar