Conference Proceedings

Receptivity analysis in under-expanded supersonic impinging jets

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

Proceedings of the 21st Australasian Fluid Mechanics Conference, AFMC 2018 | Published : 2018

Abstract

© 2018 Australasian Fluid Mechanics Society. All rights reserved. This paper presents the receptivity process at the nozzle-lip to an external forcing in the configuration of under-expanded supersonic impinging jets. The nozzle-lip is considered as a linear transformer. Therefore, the linearised three-dimensional Navier Stokes equations in cylindrical coordinate are considered. The mean flow fields are obtained from large-eddy simulations. An impulse response analysis of the linearised system is performed which allows a wide range of frequencies to be excited. The transfer function at the nozzle-lip is used to characterise the receptivity process. The sensitivity of the transfer function to ..

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