The University of Southampton
University of Southampton Institutional Repository

Instability of vertical and acoustic modes in supersonic round jets

Luo, K.H. and Sandham, N.D. (1997) Instability of vertical and acoustic modes in supersonic round jets Physics of Fluids, 9, pp. 1003-1013. (doi:10.1063/1.869196).

Record type: Article


The stability of "top-hat" and fully developed jet profiles is investigated by an inviscid linear stability theory for compressible flow. The study covers a wide range of the Mach number and the temperature ratio. Two types of instabilities are found: vortical and acoustic, each of which can be subdivided into non-radiating (subsonic) and radiating (supersonic) modes. The vortical mode is the continuation of the Kelvin-Helmholtz instability from incompressible flow. The acoustic mode is a compressible flow phenomenon, which becomes important at large Mach numbers. Temperature-ratio effects can be destabilizing or stabilizing, depending on the Mach number and mode of instability. A spectrum of unstable acoustic modes, including axisymmetric ones, are found to exist in the fully developed jet. For this jet, acoustic axisymmetric waves become more unstable than both vortical and acoustic helical waves at Mach numbers over about 3. Strong evidence of a resonance mechanism for acoustic modes is seen in the growth rate curves at high Mach numbers, where a spectrum of local peaks and valleys appears at regularly distributed frequencies

PDF instability_of_vortical_and_acoustic_modes_in_supersonic_round_jets.pdf - Version of Record
Download (243kB)

More information

Published date: 1997


Local EPrints ID: 72038
ISSN: 1070-6631
PURE UUID: 6f7cc073-f0e4-48b1-b647-8c47d94706cf

Catalogue record

Date deposited: 18 Jan 2010
Last modified: 18 Jul 2017 23:57

Export record


Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton:

ePrints Soton supports OAI 2.0 with a base URL of

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.