| Abstract | The flow field of a propane-air diffusion flame combustor with interior and exterior conjugate heat transfers was numerically studied. Results obtained from a laminar flamelet combustion model (228 reactions and 31 species), together with the re-normalization group (RNG) k-ε turbulence model, the discrete ordinates radiation model, and the NOx model, are presented and discussed. These results are compared with a comprehensive database obtained from a series of experimental measurements. The flow patterns and recirculation zone length in the combustion chamber are accurately predicted, and the mean axial velocities are in fairly good agreement with the experimental data, particularly at downstream sections. The mean temperature profiles are also captured fairly well by the laminar flamelet combustion model. Based the velocity and temperature field solutions, NOx simulation was performed in a post-processing mode. The numerical results indicate that the semi-empirical, post-processing NOx model can provide valuable NOx simulations as long as the velocity and temperature fields are adequately predicted. |
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