Experimental Investigation of a Resonant Mechanism of Amplification of Continuous-Spectrum Disturbances in an APG Boundary Layer by Means of a Deterministic Noise Method

Abstract

The paper is devoted to an experimental study of the laminar-turbulent transition in a self-similar boundary layer with an adverse pressure gradient (APG). The main attention is paid to dominating mechanisms of weakly-nonlinear interactions between the wide-band frequency-wavenumber spectrum of Tollmien-Schlichting (TS) waves (i.e. the noise-like instability waves) and a 2D primary TS-wave. In previous experiments devoted to weakly-nonlinear stages of the APG boundary-layers transition only resonant interactions of deterministic TS-waves were investigated. Moreover the resonant amplification of the purely controlled (as in the present experiment) wide-band perturbations has not been studied yet even in non-gradient (Blasius) boundary layer despite there is a great amount of investigations performed for this flow.

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 2002
Accession Number
ADA409077

Entities

People

  • D. B. Koptsev
  • V. I. Borodulin
  • Y. S. Kachanov

Organizations

  • Russian Academy of Sciences

Tags

DTIC Thesaurus Topics

  • Agreements
  • Amplification
  • Amplitude
  • Applied Mechanics
  • Boundaries
  • Boundary Layer
  • Boundary Layer Transition
  • Continuous Spectra
  • Dispersions
  • Frequency
  • Layers
  • Measurement
  • Phase Velocity
  • Pressure Gradients
  • Spectra
  • Standing Waves
  • Wind Tunnels

Fields of Study

  • Physics

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Fluid Mechanics and Fluid Dynamics.