Flowfield and far field acoustic amplification properties of heated and unheated jets

L. Maestrello, A. Bayliss

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

The interaction of an acoustic pulse with the experimentally determined mean flowfield of a spreading jet has been simulated numerically. The simulation is obtained by solving the Euler equations linearized about the spreading jet. The model shows a small, sustained oscillation long after the original pulse has passed. This remnant is seen as a continual shedding of vortices from the nozzle lip, together with the generation of acoustic ripples. The jet is also shown to act as an amplifier of sound. This amplification is traced to the stability characteristics of the jet. It is shown that some of the observed differences in the spectra of heated and unheated jets can be attributed to differences in the stability characteristics of the jets.

Original languageEnglish (US)
Pages (from-to)1539-1546
Number of pages8
JournalAIAA journal
Volume20
Issue number11
DOIs
StatePublished - Jan 1 1982

ASJC Scopus subject areas

  • Aerospace Engineering

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