Diffusion and reaction layer structure and NOx reduction in turbulent gas flames. Annual report, January 1, 1991-December 31, 1991

Technical Report · Mon Aug 24 00:00:00 EDT 1992

OSTI ID:6962597

Driscoll, J F; Dahm, W J.A.

The Annual Report describes progress made in a study aimed at identifying the fundamental mechanisms involved in NOx formation in turbulent natural gas diffusion flames and at developing novel in-flame techniques for achieving reductions in NOx emission levels in natural gas combustion applications. Temperature field images were obtained using two-dimensional Rayleigh scattering thermometry in methane-hydrogen jet diffusion flames and are being interpreted to help elucidate the basic structure of the reaction zones in flames and the relation to various species concentration fields. Highly-resolved two-dimensional conserved scalar imaging measurements from a non-reacting gaseous jet flow have been analyzed to determine the structure of numerous species concentration fields and their associated reaction rate fields in the chemical equilibrium limit. The corresponding equilibrium temperature and heat release rate fields have also been obtained for comparison with the Rayleigh thermometry measurements. These results demonstrate that while the temperature and species concentration fields may show broad zones suggestive of distributed reactions, the associated reaction rate fields indicate that the reactions in this limit are confined to relatively thin layer-like regions. Additional NOx emission index measurements have been obtained and analyzed for methane-air and hydrogen-air jet and swirl flames. These conditions have been selected to complement data obtained by other investigators at other conditions.

• Research Organization: Michigan Univ., Ann Arbor, MI (United States). Dept. of Aerospace Engineering
• OSTI ID: 6962597
• Report Number(s): PB-93-114353/XAB; CNN: GRI-5087-260-1443
• Resource Relation: Other Information: See also PB--91-232058
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
42 ENGINEERING
COMBUSTION PRODUCTS
REDUCTION
NATURAL GAS
COMBUSTION
NITROGEN OXIDES
DIFFUSION
FLAMES
MATHEMATICAL MODELS
METHANE
TURBULENT FLOW
ALKANES
CHALCOGENIDES
CHEMICAL REACTIONS
ENERGY SOURCES
FLUID FLOW
FLUIDS
FOSSIL FUELS
FUEL GAS
FUELS
GAS FUELS
GASES
HYDROCARBONS
NITROGEN COMPOUNDS
ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
THERMOCHEMICAL PROCESSES
034000* - Natural Gas- Combustion
421000 - Engineering- Combustion Systems