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Reflected shock tube experiments on aeroacoustic signature of hot jets

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Abstract

We used a reflected shock tube to investigate the acoustic signature of a hot jet at the far-field. Experiments were performed at Mach = 1.4 and a total temperature of T t = 950 Kelvin. Far-field acoustic signatures of the hot jet at six polar angles θ = 15˚ to θ = 90˚ from the jet axis) were measured and imaged by the means of continuous wavelet transform in scalograms. The results were compared with experiments from a steady test facility at similar test conditions. Further, the primary characteristics of noise events in jet far-field were compared with analytical models considering wavepacket as the main source of jet noise. The results indicate that higher frequency events at θ = 90˚ occur with a small time shift relative to the low azimuthal mode base event. This phenomenon might be the main reason why the acoustic signal at the side angles behaves more noisily than at low polar angles.

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Correspondence to Iman Bahman Jahromi.

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Recommended by Associate Editor Kyu Hong Kim

Iman Bahman Jahromi is currently a joint Ph.D. student at the Aerospace Research Institute, Tehran, Iran and at the Department of Aerospace Engineering, Sharif University of Technology, Tehran, Iran. He received his B.S. from Shahid-Bahonar University (Kerman, Iran) in 2007 and M.S. from Sharif University of Technology in 2009. His research interests include experimental aeroacoustic and shock wave dynamics.

Kaveh Ghorbanian is a Professor of Aerospace Engineering at Sharif University of Technology, Tehran, Iran. He received his Dipl. Ing. from Institute for Turbomachinery, University of Karlsruhe, W. Germany in 1988 and Ph.D. in Propulsion & Combustion from the University of Washington, Seattle, WA, USA in 1993. His research interests include gas dynamics, thermo-acoustics, gas turbine engines, and combustion.

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Jahromi, I.B., Ebrahimi, M. & Ghorbanian, K. Reflected shock tube experiments on aeroacoustic signature of hot jets. J Mech Sci Technol 31, 3811–3820 (2017). https://doi.org/10.1007/s12206-017-0725-9

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  • DOI: https://doi.org/10.1007/s12206-017-0725-9

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