Accession Number : ADA019659

Title :   Turbulent Mixing and Combustion.

Descriptive Note : Final rept. Aug 70-Jul 75,

Corporate Author : BELL AEROSPACE CO BUFFALO N Y

Personal Author(s) : Moon,L. F. ; Rudinger,G. ; Salter,G. R.

Report Date : NOV 1975

Pagination or Media Count : 60

Abstract : The behavior of recirculating flows typical of advanced air-breathing and rocket injectors, as well as high energy chemical lasers, have been experimentally investigated. The configuration used consisted of a circular duct having a sudden increase of its diameter. Step size and flow velocity were chosen to be of a magnitude representative of 'sudden-dump' combustion chambers. The recirculation, which occurred in the separation region behind the sudden expansion, was investigated using a laser-Doppler velocimeter. Detailed measurements of the mean, axial, and radial velocities were made, as well as some measurements of turbulence intensity and shear stress. A set of partial differential equations - including continuity, axial and transverse momentum, turbulence energy, and turbulence dissipation - were derived and simultaneously solved using both intergral and finite differencing techniques. Predictions made using these equations were brought into good agreement with the data taken from the recirculating flows under investigation by computer optimization of appropriate 'contants' in the models. (Author)

Descriptors :   *Turbulent flow, *Subsonic flow, *Combustors, *Chemical lasers, Air breathing engines, Rocket engines, Ducts, Expansion, Recirculation, Velocity, Measurement, Doppler systems, Velocimeters, Partial differential equations, Mathematical models, Experimental data

Subject Categories : Lasers and Masers
      Fluid Mechanics
      Jet and Gas Turbine Engines
      Rocket Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE