TY - GEN
T1 - Jet noise source distribution for coplanar nozzles; experiments and predictions
AU - Azarpeyvand, M.
AU - Battaner-Moro, J. P.
AU - Self, R. H.
PY - 2009/12/1
Y1 - 2009/12/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84864697558&partnerID=8YFLogxK
M3 - Conference Contribution (Conference Proceeding)
AN - SCOPUS:84864697558
SN - 9781615676804
T3 - 8th European Conference on Noise Control 2009, EURONOISE 2009 - Proceedings of the Institute of Acoustics
BT - 8th European Conference on Noise Control 2009, EURONOISE 2009 - Proceedings of the Institute of Acoustics
T2 - 8th European Conference on Noise Control 2009, EURONOISE 2009
Y2 - 26 October 2009 through 28 October 2009
ER -