Accession Number : ADA132843

Title :   The Response of a Laminar Boundary Layer to Sound and Wall Vibration,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE ACOUSTICS AND VIBRATION LAB

Personal Author(s) : Gedney,Charles J

PDF Url : ADA132843

Report Date : May 1983

Pagination or Media Count : 189

Abstract : An experimental analysis of the interaction of sound and plate vibration with a laminar boundary layer is presented. The two excitations generate disturbances at the leading edge of the plate which develop into Tollmien-Schlichting (TS) waves in the quasi-parallel region of the boundary layer. It is demonstrated that the TS wave and the sound wave coexist independently in this region, as predicted by the linear theory. A TS wave generated by a vibrating ribbon is shown to superimpose linearly with the sound-generated TS wave. Plate vibration is used to successfully cancel a sound-excited TS wave.

Descriptors :   *Laminar boundary layer, *Vibration, *Response, Sound waves, Walls, Reynolds number, Velocity, Sound pressure, Interactions, Plates, Comparison, Data acquisition, Frequency shift, Eigenvalues, Variables

Subject Categories : Fluid Mechanics
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE