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Proceedings of Symposium on Energy Engineering in the 21<sup>st</sup> Century (SEE2000) Volume I-IV

ISSN:
1-56700-132-7 (Print)

PRECESSION STROUHAL NUMBERS OF A SELF-EXCITED PRECESSING JET

J. Mi
Department of Mechanical Engineering, University of Adelaide, SA 5005, Australia

G. J. Nathan
Department of Mechanical Engineering, University of Adelaide, SA 5005, Australia

Abstract

The self-excited precessing jet (PJ) nozzle has been the subject of research and development for industrial applications since the discovery of naturally occurring precession of a jet partially confined in a relatively large chamber [1]. In this paper we first report how the nozzle chamber length and the jet inlet Reynolds number influence the frequency (fp) of jet precession and then seek a method of forming an appropriate Strouhal number of the precession which can effectively describe turbulent mixing in the flow downstream from the nozzle.