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Analytical investigation of conical diffusersA study was made to determine if existing data for straight-channel single-plane divergence diffusers together with boundary-layer methods could be practically employed to predict conical diffuser performance in the high-speed flow regime. A semiempirical correlation technique, which uses the experimental performance of a straight-channel single-plane divergence diffuser, and a momentum integral boundary-layer method were employed to predict conical diffuser performance. Neither of these methods is applicable when the boundary layer separates. The momentum integral method was used to study the relative importance of various boundary layer parameters in correlating unstalled diffuser performance. Other investigators have found that the best diffuser performance occurs when the diffuser is operating in the transitory stall regime. Since the analytical methods presented in this report are not applicable after the point of boundary-layer separation, a criterion was established from examination of experimental tests which allows the designer to ascertain approximate diffuser performance in the transitory stall regime.
Document ID
19720020645
Document Type
Technical Memorandum (TM)
Authors
Means, J. L. (NASA Lewis Research Center Cleveland, OH, United States)
Glance, P. C. (NASA Lewis Research Center Cleveland, OH, United States)
Klassen, H. A. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 2, 2013
Publication Date
August 1, 1972
Subject Category
FLUID MECHANICS
Report/Patent Number
NASA-TM-X-2605
E-6908
Funding Number(s)
PROJECT: RTOP 132-15
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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