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Experiments on the flow and acoustic properties of a moderate-Reynolds-number supersonic jetFlow and acoustic properties of a jet at Reynolds number of 70,000 were studied at Mach 2.1. Measurements in a free jet test facility were made with pitot tubes and hot-wire anemometry. Center-line Mach number distributions for natural and excited jets were obtained. A slow initial growth rate was in the potential core region of the jet, indicating a transition from laminar to turbulent flow in moderate Reynolds number jets. The transition occurred within the first 2-3 diameters. Spectral components were calculated for the fluctuating flowfield, and sound pressure levels were measured for the overall near-field noise. The centroid of noise was located about 8 nozzle diameters downstream. The growth rates of instabilities were determined to be in agreement with linear stability theory predictions over a broad frequency range.
Document ID
19820045621
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Troutt, T. R.
(Oklahoma State Univ. Stillwater, OK, United States)
Mclaughlin, D. K.
(Oklahoma State University Stillwater, OK, United States)
Date Acquired
August 10, 2013
Publication Date
March 1, 1982
Publication Information
Publication: Journal of Fluid Mechanics
Volume: 116
Subject Category
Aerodynamics
Accession Number
82A29156
Funding Number(s)
CONTRACT_GRANT: NSG-1467
CONTRACT_GRANT: NSF ENG-75-21405
Distribution Limits
Public
Copyright
Other

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