Simulation of a transient supersonic jet

Miller, W. A., Doolan, C. J., Prime, Z. D. and Kim, M. (2014) Simulation of a transient supersonic jet. In Proceedings of the 19th Australasian Fluid Mechanics Conference, AFMC 2014. Australasian Fluid Mechanics Society..

Record type: Conference or Workshop Item (Paper)

Abstract

This study investigates the evolution of under-expanded jets into a quiescent atmosphere using two-dimensional numerical simulation. The test case consists of two chambers separated by a wall with a small orifice. Initial pressure ratios between the two chambers were varied between 88 and 700, and the jet gas type was high pressure air exhausting into a low pressure, quiescent air chamber. During the initial transient, a Mach shock forms by rapid lateral expansion of the gas near the corner of the orifice and is initially absent at the jet centreline. As the flow evolves, the Mach shock becomes fully formed and vortex rings develop by Kelvin-Helmholtz and baroclinic instabilities at the interface of the barrel shocks and the quiescent air. After further flow evolution, the inner structure of the jet, enclosed by a barrel shock and Mach shock, resembles the structure of a steady under-expanded jet.

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