Experimental study of chemically reacting turbulent free shear layers. Quarterly report, April 1978--June 1978

Technical Report · Tue Aug 01 00:00:00 EDT 1978

DOI:https://doi.org/10.2172/6476478· OSTI ID:6476478

Gould, R. K.

A program to measure species concentrations and their statistical properties at points in well-characterized chemically reacting turbulent flows is reported. Such measurements are required for (1) testing theories of reacting turbulent systems and (2) as input to models which predict the behavior of practical combustors. The model chemical reaction being used to study turbulent mixing/reacting flows is the NO/O/sub 3/ reaction. A photolysis/chemiluminescence technique is used to measure reactant concentrations, c/sub NO/ and c/sub O/sub 3//, and a product concentration, c/sub NO/sub 2//, simultaneously at points in the flow field. From such measurements, the required statistical quantities, i.e., probability density functions and correlations of reactants and product concentrations, are being developed. These data are supplemented by measurements of the turbulence power spectra and intensity at the same points. During this report period work has centered on the writing and debugging of computer codes required to analyze the large amount of data which has been accumulated on tape during this program. The best estimate of the concentrations of NO, NO/sub 2/, and O/sub 3/ for each measurement is thus obtained. The program then obtains mean concentrations, second, third, and fourth moments for each concentration as well as some mixed second, third, and fourth moments for the run being examined. The pdf's and joint pdf's for each concentration and concentration product are obtained. These programs are now written and operational but require some further checking before using them to analyze the collected data. Also during this report period a large number of runs, each with between 16384 and 65536 separate measurements, was performed at points throughout a nonreacting jet in which NO/NO/sub 2/ mixtures exhaust into pure N/sub 2/. Two jet flows with initial centerline velocities of 9 and 32 m s/sup -1/ were examined.

• Research Organization: Aerochem Research Labs., Inc., Princeton, NJ (USA)
• DOE Contract Number: EX-76-C-01-2446
• OSTI ID: 6476478
• Report Number(s): FE-2446-7; AeroChem-TN-197
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
NITRIC OXIDE
CHEMICAL REACTIONS
NITROGEN DIOXIDE
OZONE
BOUNDARY LAYERS
COMBUSTION KINETICS
COMPUTER CALCULATIONS
NITROGEN
TURBULENCE
TURBULENT FLOW
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CRYOGENIC FLUIDS
ELEMENTS
FLUID FLOW
FLUIDS
KINETICS
LAYERS
NITROGEN COMPOUNDS
NITROGEN OXIDES
NONMETALS
OXIDES
OXYGEN COMPOUNDS
REACTION KINETICS
400800* - Combustion
Pyrolysis
& High-Temperature Chemistry