Jet noise source distribution for coplanar nozzles; experiments and predictions

M. Azarpeyvand*, J. P. Battaner-Moro, R. H. Self

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

Abstract

In this paper we study the mechanism of jet noise production in coaxial flows. We shall present various experimental results for isothermal and heated coplanar jet flows of four area ratios (0.81, 2, 3, and 4), operating at different velocity ratios, ranging from 0.60 up to 1.26. A polar array technique has been used to find the axial distribution of the jet sources. In order to better understand the behavior of the experimental results, some computational fluid dynamics simulations are performed, and a basic theoretical model based on Lighthill's Acoustic Analogy is also developed. It is shown that some significant changes occur to the flow structure and therefore the jet noise source distribution at velocity ratio of about 0.8, and also for the nozzles with area ratio of 2 to 4. It has also been shown that the most important high and low frequency sources for low velocity ratio flows are aggregated in a region about seven to ten secondary diameters downstream, while at higher velocity ratios sources are continuously spread from about one up to ten secondary diameters downstream. The effect of the primary flow temperature is also examined.

Original languageEnglish
Title of host publication8th European Conference on Noise Control 2009, EURONOISE 2009 - Proceedings of the Institute of Acoustics
EditionPART 3
Publication statusPublished - 1 Dec 2009
Event8th European Conference on Noise Control 2009, EURONOISE 2009 - Edinburgh, United Kingdom
Duration: 26 Oct 200928 Oct 2009

Publication series

Name8th European Conference on Noise Control 2009, EURONOISE 2009 - Proceedings of the Institute of Acoustics
NumberPART 3
Volume31

Conference

Conference8th European Conference on Noise Control 2009, EURONOISE 2009
CountryUnited Kingdom
CityEdinburgh
Period26/10/0928/10/09

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