The effect of walls on instability waves in supersonic shear layers

Philip John Morris, M. G. Giridharan

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

A spatial stability analysis is performed to determine the effect of wall placement on instability waves in confined supersonic shear layers. It is shown that the growth rates of Kelvin-Helmholtz instability waves are independent of wall height. However, supersonic instability waves are found to exhibit peaks and valleys in their growth rate curve as a result of the reinforcement and cancellation of the reflected Mach waves at the shear layer. Finally, it is shown how the instability growth rates in a ducted shear layer may be maximized by the proper choice of the duct width to height ratio.

Original languageEnglish (US)
Pages (from-to)356-358
Number of pages3
JournalPhysics of Fluids A
Volume3
Issue number2
DOIs
StatePublished - Jan 1 1991

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Ducts
Mach number
Reinforcement

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

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The effect of walls on instability waves in supersonic shear layers. / Morris, Philip John; Giridharan, M. G.

In: Physics of Fluids A, Vol. 3, No. 2, 01.01.1991, p. 356-358.

Research output: Contribution to journalArticle

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AU - Giridharan, M. G.

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AB - A spatial stability analysis is performed to determine the effect of wall placement on instability waves in confined supersonic shear layers. It is shown that the growth rates of Kelvin-Helmholtz instability waves are independent of wall height. However, supersonic instability waves are found to exhibit peaks and valleys in their growth rate curve as a result of the reinforcement and cancellation of the reflected Mach waves at the shear layer. Finally, it is shown how the instability growth rates in a ducted shear layer may be maximized by the proper choice of the duct width to height ratio.

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