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Effects of small-scale, high intensity inlet turbulence on flow in a two-dimensional diffuserThe flow through a 2D experimental diffuser with channel width 2.60 cm and divergence angle (2 theta) 9 or 20 deg is investigated experimentally for inlet Reynolds number 78,300 and velocity 43.9 m/s, with and without vertical rods to generate inlet turbulence in excess of the limits defined by Hoffmann (1981) and Hoffmann and Gonzales (1983). Measurements are obtained using a thermal wall-flow-direction probe and a single hot-wire velocity probe, and the results are presented graphically. Significant increases in the pressure-recovery coefficient of the diffuser (10 percent at 9 deg and 22 percent at 20 deg) are attributed to the action of turbulence to reduce distortion and delay separation, thus creating an altered flow condition with symmetrical velocity profiles.
Document ID
19840055573
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Hoffmann, J. A.
(California Polytechnic State University San Luis Obispo, CA, United States)
Gonzalez, G.
(California Polytechnic State Univ. San Luis Obispo, CA, United States)
Date Acquired
August 12, 2013
Publication Date
June 1, 1984
Publication Information
Publication: ASME, Transactions, Journal of Fluids Engineering
Volume: 106
ISSN: 0098-2202
Subject Category
Aerodynamics
Accession Number
84A38360
Funding Number(s)
CONTRACT_GRANT: NSG-2391
Distribution Limits
Public
Copyright
Other

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