Accession Number : AD0666806

Title :   THE INCOMPRESSIBLE COANDA FLOW AROUND CIRCULAR CYLINDER AFFECTED BY SOUND ENERGY.

Descriptive Note : Technical rept. 1 Nov 64-28 Feb 66,

Corporate Author : CATHOLIC UNIV OF AMERICA WASHINGTON D C DEPT OF MECHANICAL ENGINEERING

Personal Author(s) : Chang,Paul K. ; Casarella,Mario J. ; Kelnhofer,William J.

Report Date : 28 FEB 1966

Pagination or Media Count : 90

Abstract : The sound energy causes a noticeable effect on the velocity profile and does, in fact, shift the point of detachment. Prior to detachment, the results indicate that the sound energy superimposes a clockwise vortex flow pattern on the original Coanda flow. This causes a decrease in the total momentum of the shear layer below the neutral point (the point in the velocity profile unaffected by sound) and increases the momentum above the neutral point. The decibel level of the sound pressure and the frequency of the sonic excitation will also affect the structure of the shear layer. The boundary layer around the cylinder grows more rapidly with increasing sound pressure level. (Author)

Descriptors :   (*INCOMPRESSIBLE FLOW, COANDA EFFECT), CYLINDRICAL BODIES, SOUND, ENERGY, FLOW SEPARATION, VELOCITY, VORTICES, MOMENTUM, ACOUSTICS, SHEAR STRESSES, BOUNDARY LAYER, PRESSURE, FREQUENCY

Subject Categories : Aerodynamics
      Acoustics
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE