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Compressible starting jet: pinch-off and vortex ring–trailing jet interaction

Published online by Cambridge University Press:  27 March 2017

Juan José Peña Fernández Open the ORCID record for Juan José Peña Fernández [Opens in a new window]  and
Jörn Sesterhenn
Juan José Peña Fernández*
Affiliation:
Institut für Strömungsmechanik und Technische Akustik, Technische Universität Berlin, 10623, Berlin, Germany
Jörn Sesterhenn
Affiliation:
Institut für Strömungsmechanik und Technische Akustik, Technische Universität Berlin, 10623, Berlin, Germany
*
†Email address for correspondence: [email protected]
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Abstract

The dominant feature of the compressible starting jet is the interaction between the emerging vortex ring and the trailing jet. There are two types of interaction: the shock–shear layer–vortex interaction and the shear layer–vortex interaction. The former is clearly not present in the incompressible case, since there are no shocks. The shear layer–vortex interaction has been reported in the literature in the incompressible case and it was found that compressibility reduces the critical Reynolds number for the interaction. Four governing parameters describe the compressible starting jet: the non-dimensional mass supply, the Reynolds number, the reservoir to unbounded chamber temperature ratio and the reservoir to unbounded chamber pressure ratio. The latter parameter does not exist in the incompressible case. For large Reynolds numbers, the vortex pinch-off takes place in a multiple way. We studied the compressible starting jet numerically and found that the interaction strongly links the vortex ring and the trailing jet. The shear layer–vortex interaction leads to a rapid breakdown of the head vortex ring when the flow impacted by the Kelvin–Helmholtz instabilities is ingested into the head vortex ring. The shock–shear layer–vortex interaction is similar to the noise generation mechanism of broadband shock noise in a continuously blowing jet and results in similar sound pressure amplitudes in the far field.

JFM classification

Compressible Flows: Compressible Flows Wakes/Jets: Jets Acoustics: Jet noise
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Papers
Information
Journal of Fluid Mechanics , Volume 817 , 25 April 2017 , pp. 560 - 589
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© 2017 Cambridge University Press 

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