Accession Number:

AD0702442

Title:

LASER PLANOGRAM MEASUREMENTS OF TURBULENT MIXING STATISTICS IN THE NEAR WAKE OF A SUPERSONIC CONE

Descriptive Note:

Corporate Author:

AVCO EVERETT RESEARCH LAB INC EVERETT MA

Personal Author(s):

Report Date:

1970-03-01

Pagination or Media Count:

21.0

Abstract:

The laser planogram technique is a new method for the study of turbulent mixing. It utilizes a pulsed laser and a particulate tracer to determine the spatial mixing field of tagged and untagged fluids. The laser planogram technique is described along with design considerations. As an example of its implementation, laser planogram measurements were obtained and analyzed to provide turbulent mixing statistics in the wake of a cone at a Mach number of 2.5, and a Reynolds number of 3,000,000. The mean radial concentration profile of tagged material is shown to be a Gaussian in agreement with theory. A k exp -53 spectral dependence on wave number is observed which is characteristic of high turbulent Reynolds number flows. Experimental limitations prevent the resolution of the turbulent scale lengths in the present experiment although the integral scale should be easily resolved with increased data length.

Subject Categories:

  • Aerodynamics
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE