Journal article

Receptivity characteristics of under-expanded supersonic impinging jets

S Karami, PC Stegeman, A Ooi, V Theofilis, J Soria

Journal of Fluid Mechanics | Cambridge University Press (CUP) | Published : 2020

Abstract

The receptivity of an under-expanded supersonic impinging jet flow at a sharp nozzle lip to acoustic impulse disturbances is investigated as a function of geometric and flow parameters. The under-expanded supersonic jets emanate from an infinite-lipped nozzle, i.e. the nozzle exit is a circular hole in a flat plate. Two specific cases have been investigated corresponding to nozzle-to-wall distances of h = 2d and 5d, where d is the jet diameter, at a nozzle pressure ratio of 3.4 and a Reynolds number of 50 000. Receptivity in this study is defined as originally coined by Morkovin (Tech. Rep. AFFDL TR, 1969, pp. 68-149; see also Reshotko, AGARD Special Course on Stability and Transition of Lam..

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Funding Acknowledgements

This work was supported by the Australian Research Council. The research benefited from computational resources provided through the National Computational Merit Allocation Scheme, supported by the Australian Government. The computational facilities supporting this project included the Australian NCI Facility, the partner share of the NCI facility provided by Monash University through an ARC LIEF grant, Pawsey Supercomputing Centre and the Multi-modal Australian ScienceS Imaging and Visualisation Environment (MASSIVE).