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.
Similar content being viewed by others
Author information
Authors and Affiliations
Additional information
Received: 17 March 1995/Accepted: 7 December 1995
Rights and permissions
About this article
Cite this article
Schneider, G., Froud, D., Syred, N. et al. Velocity measurements in a precessing jet flow using a three dimensional LDA system. Experiments in Fluids 23, 89–98 (1997). https://doi.org/10.1007/s003480050089
Issue Date:
DOI: https://doi.org/10.1007/s003480050089