Pdf modeling of turbulent nonpremixed methane jet flames

Journal Article · Sat Dec 31 23:00:00 EST 1988 · Combustion Science and Technology; (UK)

DOI:https://doi.org/10.1080/00102208908924038· OSTI ID:5083111

Chen, J Y; Kollmann, W; Dibble, R W ^[1]

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1. Sandia National Labs., Livermore, CA (USA). Combustion Research Faclity

An expanded model of turbulent nonpremixed combustion is presented. In the model, the scalar mixing and reactions are described by a probability density function (pdf) submodel capable of handling five scalars, while the turbulent velocity field is described by a second-order moment closure. Two plausible chemical reaction models are considered: a five-scalar, four-step, reduced reaction mechanism, and a four-scalar constrained equilibrium model. Detailed comparisons of model predictions with laser Raman experimental dat provide a valuable evaluation of the model's ability in predicting nonequilibrium chemistry in turbulent nonpremixed flames. Overall, the model fails to predict greater departure from chemical equilibrium as mixing rates are increased. Interestingly, this failure is not due to the chemical model, both of which perform satisfactorily. Instead, the failure to predict greater departure from chemical equilibrium is a subtle artifact of the current Monte Carlo simulation of turbulent mixing and chemical reaction.

• OSTI ID: 5083111
• Journal Information: Combustion Science and Technology; (UK), Journal Name: Combustion Science and Technology; (UK) Vol. 64:4-6; ISSN 0010-2202; ISSN CBSTB
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
034000* -- Natural Gas-- Combustion
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800 -- Combustion
Pyrolysis
& High-Temperature Chemistry
ALKANES
CHEMICAL REACTION KINETICS
FLAMES
FLUID FLOW
HYDROCARBONS
KINETICS
METHANE
MONTE CARLO METHOD
ORGANIC COMPOUNDS
RAMAN SPECTRA
REACTION KINETICS
SIMULATION
SPECTRA
TURBULENT FLOW