Accession Number:

ADA250221

Title:

Turbulent Spot Generation and Growth Rates in a Transonic Boundary Layer

Descriptive Note:

Final rept. 15 May 1989-14 Oct 1991

Corporate Author:

OXFORD UNIV (UNITED KINGDOM) DEPT OF ENGINEERING SCIENCE

Report Date:

1992-03-18

Pagination or Media Count:

24.0

Abstract:

Wide-bandwidth surface heat transfer instrumentation has been used to track the generation, convection and growth of turbulent spots in a laminar boundary layer undergoing transition to turbulence. The model was a flat plate subjected to a range of free stream conditions in a piston-driven isentropic compression heated transient wind tunnel at Oxford University. Freestream Mach number subsonic to 2.0, freestream turbulence and streamwise pressure gradient favorable to adverse were varied. Preliminary analysis of the time-resolved heat transfer data allowed estimates of spot convection rates, generation rates and spreading angles to be estimated. Convection rates were little affected by Mach number whereas spreading angles were narrowed by favorable pressure gradients and expanded by adverse gradients, boundary layers, transition, turbulent spots, compressibility effects

Subject Categories:

  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE