Mathematical modeling and scaling of fluid dynamics and NO{sub x} characteristics of natural gas burners

Book · Sat Dec 31 00:00:00 EST 1994

OSTI ID:72854

Peters, A A.F.; Weber, R ^[1]

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1. International Flame Research Foundation, Ijmuiden (Netherlands)

Predictions of two unstaged (high-NO{sub x}) swirling natural gas flames of 4 MW and 12 MW thermal input have been performed and compared with the measurements. In scaling the burners, the constant-velocity-scaling criterion has been applied together with geometrical similarity. The applied mathematical modes for main flame properties and nitric oxide predictions have been discussed. The two-step-reaction turbulent combustion model is based on the eddy-break-up concept, i.e. mixing. In the NO{sub x}-postprocessor, thermal-NO and prompt-NO formation rates are obtained by means of statistically averaging of the corresponding chemical reaction rates over the fluctuating temperature. In the predictions the two flames scale perfectly whereas the measurements indicate some departures from thermal similarity in particular. It was observed that the degree of combustion for both flames was dependent on the residence time of fluid pockets in the reacting shear layer. As the turbulent combustion model has been based solely on mixing, i.e. the turbulent flow field, the non-similarity of the flames could not be predicted. Possible future improvements to the turbulent combustion model are addressed. 3D-modeling, i.e. modeling of individual natural gas jets, shows a significant improvement and is therefore to be preferred over 2D-modeling.

• OSTI ID: 72854
• Report Number(s): CONF-941007-; TRN: IM9530%%346
• Resource Relation: Conference: 1994 international joint power generation conference, Phoenix, AZ (United States), 2-6 Oct 1994; Other Information: PBD: 1994; Related Information: Is Part Of Combustion modeling, scaling and air toxins; Gupta, A.K.; Moussa, A.; Presser, C.; Rini, M.J.; Weber, R.; Woodward, G. [eds.]; PB: 237 p.
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
GAS BURNERS
MATHEMATICAL MODELS
NATURAL GAS
COMBUSTION KINETICS
NITRIC OXIDE
CHEMICAL REACTION YIELD
FLAMES
THREE-DIMENSIONAL CALCULATIONS
TWO-DIMENSIONAL CALCULATIONS
SIZING
MASS BALANCE
MOMENTUM TRANSFER
VORTEX FLOW
ENERGY BALANCE
ENTHALPY
FLUID MECHANICS
TEMPERATURE DISTRIBUTION
EXPERIMENTAL DATA