Accession Number : AD0770998

Title :   Investigation of Test Facility Environmental Factors Affecting Boundary Layer Transition.

Descriptive Note : Technical rept. Sep 71-Jul 73,

Corporate Author : AIR FORCE FLIGHT DYNAMICS LAB WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Boison,J. Christopher

Report Date : SEP 1973

Pagination or Media Count : 172

Abstract : Tests were conducted on the sidewall boundary layer of a 4-inch I.D. shock tube over a shock Mach number range 3 to 15 and unit Reynolds number range of 500000 per foot to 4000000 per foot. Effects of facility environments, measured with accelerometers and microphones, were correlated with boundary layer transition Reynolds numbers and other flow parameters such as the boundary layer cooling ratio, static and dynamic pressures and local flow Mach number. At a fixed unit Reynolds number a multiple reversal transition Reynolds number curve was and dynamic pressures and local flow Mach number. At a fixed unit Reynolds number a multiple reversal transition Reynolds number curve was found as a function of wall cooling. Also, spectral content of wall and acoustic fluctuations was found to correlate with transition Reynolds number for a discrete set of frequencies. (Author)

Descriptors :   *Boundary layer transition, *Shock tubes, Gas dynamics, Test facilities, Flow fields, Reynolds number, Environments, Walls, Cooling, Acoustic properties

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE