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The Dependence of Diffuser Performance upon Inlet Flow Conditions

Published online by Cambridge University Press:  04 July 2016

J. L. Livesey  and
J.T. Turner
J. L. Livesey
Affiliation:
University of Manchester
J.T. Turner
Affiliation:
University of Manchester
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Extract

It was recently stated by Cockrell, Diamond and Jones(1) that attempts to correlate diffuser loss coefficients with the inlet boundary layer momentum thickness were generally unsatisfactory. In particular, it had proved impossible to align various results from diffuser tests which had been made with differing inlet flow conditions. The two methods of thickening the diffuser inlet boundary layer, using either

(a) a length of parallel pipe, or

(b) screen rings at inlet to the diffuser

led to a corresponding variation in diffuser performance.

The conclusion was drawn that “the manner by which an inlet boundary layer has been thickened is as significant in determining diffuser performance as is the thickness of the layer. No satisfactory inlet flow parameter is at present known”.

Type
Research Article
Information
The Aeronautical Journal , Volume 69 , Issue 659 , November 1965 , pp. 794 - 795
Copyright
Copyright © Royal Aeronautical Society 1965

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References

1.Cockrell, D. J., Diamond, M. J. and Jones, G. D.The Diffuser Inlet Flow Parameter. Journal of the Royal Aeronautical Society, Vol. 69, pp 350–352, May 1965.CrossRefGoogle Scholar
2.Livesey, J. L. and Turner, J. T.The Effect of Velocity Profile Decay on Shear Flow in Diffusers. Int J Mech Sci,Vol. 6, pp 371–379, October 1964.Google Scholar
3.Livesey, J. L. and Turner, J. T.The Generation of Symmetrical Duct Velocity Profiles of High Uniform Shear. J Fluid Mech, Vol. 20, pp 201–208, October 1964.CrossRefGoogle Scholar
4.Livesey, J. L., Parker, E. and Jones, P. K.The Production of Velocity Profiles with High Peakiness. Journal of the Royal Aeronautical Society, Vol. 60, pp 415–417, June 1956.Google Scholar