Numerical Simulation Of HTAC With Coherent Multi-jet

The technology of high temperature air combustion achieves low NO_X emission, because of the special arrangement mode of fuel nozzle and air nozzle. It is the key for high temperature combustion that makes fuel stream burned at very low oxygen concentration and reduces NO_X emission by optimizing burner configuration.In the article a numerical simulation process in a restricted space for steady-state is created by FLUENT which is CFD software. K-εturbulent model, PDF non-premixed combustion model, coupled Zeldovich thermal NO_X formation model and discrete coordinate radiation model are considered in the physical model.The concentration, temperature, fluid flow and NO_X concentration are studied by changing some parameters such as the straddle angle of combustion air, the inclined angle of fuel injection, the ratio of fuel velocity and air velocity, the displacement of the fuel nozzle from the air nozzle and the oxygen concentration of air.Some conclusions are concluded: The straddle angle of combustion air has a great influence on the temperature distribution and NO_X concentration. The NO_X concentration reduces a lot along with the increasing of the straddle angle, the highest reducing percent is 46%. Angle of fuel injection affects the oxygen concentration field, temperature field and NO_X emission. The smaller the inclined angle of fuel injection is, the more uniform the temperature distribution. It is better to reduce NO_X emission. The uniform temperature distribution and the lowest NO_X concentration are acquired at v_f lv_α= 1.18; on the other side,NO_X emission is controlled along with increasing the injector offset distance, and the lowest concentration is 42ppm. The calculating result is the theory foundation for studying high temperature air combustion.