Measurements of nonlinear transfer functions for subharmonic generation in mixing layers

R. W. Miksad, M. R. Hajj, E. J. Powers

Research output: Contribution to conferencePaperpeer-review

1 Scopus citations

Abstract

The nonlinear mechanisms responsible for the generation of subharmonic fluctuations in a transitioning mixing layer are determined by using polyspectral transfer function techniques. Cross-bispectral analysis is used to identify three-wave couplings, and quadratic transfer functions are measured to determine the spectral transfer of energy due to nonlinear interactions. The concept of interaction potential is used to identify potential pairs of fluctuations which can transfer energy to subharmonic fluctuations. The results show that the initial stage of subharmonic growth docs not seem to be due to nonlinear interactions. In this stage, fluctuations near the subharmonic frequency grow at a rate close to that predicted by linear instability theory. The second stage of subharmonic growth docs seem to be due to a nonlinear three-wave interaction mechanism.

Original languageEnglish
DOIs
StatePublished - 1989
EventAIAA 2nd Shear Flow Conference, 1989 - Tempe, United States
Duration: 13 Mar 198916 Mar 1989

Conference

ConferenceAIAA 2nd Shear Flow Conference, 1989
Country/TerritoryUnited States
CityTempe
Period13/03/8916/03/89

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