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Type: Journal article
Title: Velocity measurements in a precessing jet flow using a three dimensional LDA system
Author: Schneider, G.
Froud, N.
Syred, N.
Nathan, G.
Luxton, R.
Citation: Experiments in Fluids: experimental methods and their applications to fluid flow, 1997; 23(2):89-98
Issue Date: 1997
ISSN: 0723-4864
Abstract: The turbulent, three dimensional and time dependent flow field of a precessing jet is investigated. In the present case the jet precession is generated by mechanically rotating a round jet inclined relative to the axis of rotation. A conditional flow visualisation technique is used to complement three dimensional laser Doppler velocity data, time-averaged and phase-averaged at the frequency of precession. The conditional phase-averaging technique enables phase-averaged velocity contours and vectors to be obtained which reveal flow patterns and structures within the flow field. Time-averaging of the velocity data shows that these structures are significant in that they generate a reverse flow (recirculation) region between the jet and its spinning axis. They are found also to cause a rapid decay of the mean velocity. The characteristics of the precessing jet found here are compared with previous investigations of the same flow and with investigations of other turbulent jets.
DOI: 10.1007/s003480050089
Appears in Collections:Aurora harvest 6
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