Accession Number:

AD0698326

Title:

MEASUREMENTS AND CORRELATIONS OF TRANSITION REYNOLDS NUMBERS ON SHARP SLENDER CONES AT HIGH SPEEDS

Descriptive Note:

Final rept. 30 Jul-26 Sep 1968

Corporate Author:

ARO INC ARNOLD AFS TN

Personal Author(s):

Report Date:

1969-12-01

Pagination or Media Count:

55.0

Abstract:

An experimental investigation of laminar boundary-layer transition on a sharp, 10-deg total-angle, insulated cone at zero yaw was conducted in 12- and 40-in. supersonic wind tunnels at free-stream Mach numbers from 3 to 6. This research was directed toward defining the relationship between the aerodynamic noise disturbances and boundary-layer transition Reynolds numbers in high-speed wind tunnels and extended previously published planar results to include axisymmetric models. A significant increase in the Reynolds numbers with increasing tunnel size similar to the planar results is shown to exist. Sharp cone transition Reynolds numbers from ten facilities 12- to 54-in. for free- stream Mach numbers from 3 to 14 and a unit Reynolds number per inch range from 100,000 to 1,200,000 were correlated using aerodynamic-noise-transition parameters. A quantitative correlation of the ratio between cone and planar Reynolds numbers values was developed which demonstrates a strong Mach number dependence and also indicates a variation with tunnel size and unit Reynolds number.

Subject Categories:

  • Aerodynamics
  • Acoustics
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE