Accession Number : AD0719724

Title :   A Theoretical Investigation of Acoustic-Tubulent Interactions with Application to Free-Jet Spreading.

Descriptive Note : Doctoral thesis,

Corporate Author : PURDUE UNIV LAFAYETTE IND

Personal Author(s) : Simcox,Craig Dennis

Report Date : JAN 1969

Pagination or Media Count : 133

Abstract : Recent experimental investigations have demonstrated that applied acoustic waves of appropriate frequencies can change the spreading rate of a free turbulent jet or the reattachment location of a separated-reattaching jet. Several posible interactions are considered briefly. It is concluded that the observed effects in small turbulent jets can result from the direct interaction of the acoustic waves and the turbulent structure. The interaction of a monochromatic acoustic wave and a single harmonic vorticity fluctuation is considered first. The acoustic field is considered to be applied externally. The result shows significant changes of the steady or d-c vorticity when the eddy wave-number component of the vorticity fluctuation in the direction of sound travel equals the wave-number of the applied sound. Using Fourier transforms the result is extended to consider an entire spectrum of turbulent vorticity fluctuations. The spectrum is integrated to find the change due to the acoustic input of various turbulent parameters including the three-dimensional energy spectrum and Reynolds stresses. (Author)

Descriptors :   (*JET MIXING FLOW, TURBULENCE), (*FLUIDICS, JETS), FLOW SEPARATION, MECHANICAL WAVES, FLOW SEPARATION, VORTICES, HARMONIC ANALYSIS, REYNOLDS NUMBER, THREE DIMENSIONAL FLOW, THEORY, MATHEMATICAL MODELS, THESES

Subject Categories : Fluidics and Fluerics

Distribution Statement : APPROVED FOR PUBLIC RELEASE