单头部模型燃烧室燃烧组织及 NOx 排放

Combustion organization and NOx formation characteristics in a single sector model lean premixed pre-vaporized combustor were investigated by optical experiments and 3-dimensional numerical simulations. The flow field，spray field，OH and NO species field in the combustor were simulated by the Reynolds-averaged Navier-Stokes method and then compared with the experimental results. It was found that the prediction errors of the flow field and spray angle were 13.9% and 6.0%， respectively. The predicted OH and NO distribution characteristics were in good agreement with the experimental results. The results showed that the main and pilot flames organized combustion in a weakly coupled way，and most NO was generated in high temperature region located in the pilot stage. The variation (0.15− 0.30) of fuel staging ratio did not affect the flow and combustion structure，but it had a certain influence on the NO emission，which decreased with the increase of the fuel staging ratio.