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A Note on the Spatial Jet-Instability of the Compressible Cylindrical Vortex Sheet

Michalke, Alfons (1970) A Note on the Spatial Jet-Instability of the Compressible Cylindrical Vortex Sheet. DLR-Forschungsbericht. Deutsche Forschungs- und Versuchsanstalt für Luft-und Raumfahrt, e.V..

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Abstract

The instability of compressible circular jets with respect to spatially growing disturbances is the subject of this note. The linearized inviscid disturbance equations have been derived for a compressible circular jet with variable temperature and density profile. The eigenvalues of the instability problem for the cylindrical vortex sheet have been computed and discussed for various Strouhal numbers, Mach numbers and temperature ratios. It is found that contrary to temporal amplification the phase velocity of spatially growing disturbances can exceed the jet velocity. Furthermore, additional disturbance modes exist in the spatial case.

Document Type:Monograph (DLR-Forschungsbericht)
Title:A Note on the Spatial Jet-Instability of the Compressible Cylindrical Vortex Sheet
Authors:
AuthorsInstitution or Email of Authors
Michalke, AlfonsUNSPECIFIED
Date:April 1970
Number of Pages:18
Publisher:Deutsche Forschungs- und Versuchsanstalt für Luft-und Raumfahrt, e.V.
Series Name:Deutsche Luft- und Raumfahrt Forschungsbericht
Status:Published
Keywords:Instability, jet, vortex sheet, spatial instability, jet-instability
Institution:Deutsche Forschungs-und Versuchsanstalt für Luft- und Raumfahrt
Department:Institut für Turbulenzforschung
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:L - no assignement
DLR - Research theme (Project):L -- no assignement
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Propulsion Technology > Engine Acoustic
Deposited By: Prof. Dr.-Ing. Ulf Michel
Deposited On:08 Feb 2010 08:56
Last Modified:08 Feb 2010 08:56

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