Accession Number : ADA187760

Title :   Chemically Reacting Turbulent Flow.

Descriptive Note : Final rept. 1 Oct 82-30 Sep 85,

Corporate Author : NATIONAL BUREAU OF STANDARDS GAITHERSBURG MD

Personal Author(s) : Pitts, William M ; Kashiwagi, Takashi

PDF Url : ADA187760

Report Date : 06 Dec 1985

Pagination or Media Count : 39

Abstract : This report summarizes the results on chemically reacting turbulent flow. The development of new diagnostics for variable density flows are described. These include Rayleigh light scattering for real-time, spatially-resolved concentration measurements, combined Rayleigh light scattering and hot wire anemometry for simultaneous concentration and velocity measurements, and the development of a digital line camera which has allowed the concentration measurement to be made along a line. A study of heat transfer from heated cylinders is discussed which has generated a much improved correlation of experimental results. Shadowgraph visualization studies and centerline concentration measurements are described for variable density, axisymmetric turbulent jets covering jet to coflow density ratios of 0.14 to 37. These studies have also included a limited investigation of Reynolds number effects. The observed dependence of the mixing behavior on the density ratio and Re have led us to make new hypotheses are shown to lead to qualitative predictions for the turbulent mixing which are in agreement with experimental findings.

Descriptors :   *HOT WIRE ANEMOMETERS, *LIGHT SCATTERING, *RAYLEIGH SCATTERING, *TURBULENT FLOW, BEHAVIOR, CAMERAS, CORRELATION, CYLINDRICAL BODIES, DENSITY, DIAGNOSIS(GENERAL), DIGITAL SYSTEMS, FLOW, HEAT, HEAT TRANSFER, HYPOTHESES, JET FLOW, MEASUREMENT, MIXING, PREDICTIONS, RATIOS, REYNOLDS NUMBER, SPARK SHADOWGRAPH PHOTOGRAPHY, VARIABLES, VELOCITY

Subject Categories : Combustion and Ignition

Distribution Statement : APPROVED FOR PUBLIC RELEASE