A Comparison of CMC and PDF Modelling Predictions with Experimental Nitric Oxide LIF/Raman Measurements in a Turbulent H2Jet Flame

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Abstract
The prediction of nitric oxide (NO) formation in turbulent flames requires a modelling approach that takes into account the coupled nature of local turbulent mixing and chemical reaction. The Conditional Moment Closure (CMC) and Probability Density Function (PDF) methods have been developed to include these interactions, and have been applied in this case to predict NO formation in a turbulent nonpremixed hydrogen jet flame with a Reynolds number of 10000. Instantaneous point measurements of NO concentrations have been made by the simultaneous use of Laser Induced Fluorescence of NO, Rayleigh scattering and Raman scattering. These point measurements provide quantitative information regarding NO formation as a function of mixture fraction within the flame itself. It has been found that the CMC and PDF modelling methods predict NO concentrations to within 30% of the levels measured at each location. Results show that the effects of differential diffusion and flame radiation are significant in a turbulent flame of this type, the former in upstream regions of the flame and the later in downstream regions of the flame