ON MASS ENTRAINMENT BY JETS. PHASE II. THE EFFECT OF SOUND ON JETS,

Abstract

The report represents an effort to bring the complex phenomena associated with the artificial stimulation of jet boundaries into the realm of useful information for the fluidics engineer. The motivation for this study is twofold: first, the potential uses of this phenomenon as a means of control, and second, the evaluation of the effect of environmental noise on a fluidic device. The entrainment augmentation shown by a jet under the influence of harmonic disturbances in certain regimes of frequency and amplitude is considered in the light of the stability theory. The highlights of the theory are discussed along with some comments on vortex shedding. Evidence is shown that the main mechanism behind the additional entrainment in the excited jet is the acceleration of the rate of growth of the disturbances. Data is presented on the effect of sound on the entrainment and reattachment points in a Coanda flow for two different Reynolds numbers, for various values of amplitude and frequency of the disturbing sound. (Author)

Document Details

Document Type
Technical Report
Publication Date
Jan 11, 1967
Accession Number
AD0648667

Entities

People

  • Elisabeth D. Martínez

Tags

DTIC Thesaurus Topics

  • Amplitude
  • Boundaries
  • Engineers
  • Entrainment
  • Flow
  • Fluid Flow
  • Fluidic Devices
  • Fluidics
  • Frequency
  • Motivation
  • Reynolds Number
  • Test And Evaluation
  • Vortex Shedding
  • Vortices

Fields of Study

  • Physics

Readers

  • Aerodynamics/Aeronautics.
  • Fluid Dynamics.
  • Theoretical Analysis.