Accession Number:

ADA190572

Title:

Investigation of Boundary Layer Disturbances Caused by Periodic Heating of a Thin Ribbon

Descriptive Note:

Master's thesis

Corporate Author:

AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING

Personal Author(s):

Report Date:

1988-03-01

Pagination or Media Count:

112.0

Abstract:

Wind tunnel experiments were conducted to investigate the use of a periodically heated Nichrome ribbon as a boundary layer control device. The specific items of interest were 1 the physical parameters governing the ribbon behavior, 2 the consequence of the ribbon on the downstream development of the laminar boundary layer and 3 the controllability of the ribbon to produce the desired consequence. The disturbances detected in the boundary layer immediately downstream of the vibrating ribbon exhibited the same frequency characteristics as the ribbon. The evolution of these disturbances in the boundary layer was studied by positioning a hot wire anemometer, boundary layer probe at different locations behind the ribbon. The selective amplification and damping of the disturbance frequencies agreed with the predictions of linear Tollmien- Schlichting stability theory.

Subject Categories:

  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE