Abstract
A mathematical model that employs conditionally averaged quantities in predicting finite rate chemical kinetic effects in turbulent flames has been developed. Modelling of turbulent combustion with a Conditional Moment Closure (CMC) method is a new, computationally inexpensive approach that shows significant promise. Nonpremixed hydrogen jet flames have been considered in detail, by employing a twelve species, twenty-four reaction skeletal mechanism. Calculated results show super-equilibrium H, O and OH radical abundances, and subequilbrium flame temperatures which decay towards equilibrium away from the nozzle. NOx emission levels are accurately predicted for a wide range of different flow cases the predictions showing the same 1/2 power dependence, between the residence-time scaled emission index and the jet velocity upon nozzle diameter parameter, as that reported in experiments.
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