Numerical Study Of Influence Of The Combined Air-Atomizer On Combustion Performance

To increase thermal energy efficiency and to reduce combustion pollutant formation are one of important research in the current energy and environment situation. High-efficience combustion and low pollution exhaust are achieved through changing the swirl number and structure of swirlers .Swirlers have developed from the single-stage to the dual-stage and multi-stage, and the multi-stage swirler has more advantage over the single-stage swirler. In this paper, the combustor with the dual-swirler combined air-atomizer is investigated based on numerical simulation method.In this paper, a single head combustor is set up in the light of some aero-engine combustor parameters. Using the FLUENT software, under the same boundary conditions, the flow field, temperature field and emission of the combustor are numerically simulated through changing the swirl number, vanes and spin. During numerical calculation, the k-εturbulence model, the probability density function combustion model, discreate ordinate methord radiation model , random orbit particle model and the thermal NO_X model are chosed, and the pressure - velocity (SIMPLE) coupling method is numerically solved. The calculation shows that the interaction between the primary swirl and the secondary swirl brings fuel to achieve better fragmentation effects and more complete combustion, to have effect on fuel atomization of the primary swirl and to control the head flame of combustor of the secondary swirl. It is concluded that a reasonable match between the primary swirl and secondary swirl has impact on the combustion performance. Under certain swirler number, the number of vane can obtain more complete broken, but not conducive to control fuel trajectory. Compared with the co-swirlers, the counter-swirlers can formate a larger recirculation zone in the head of combustion chamber, conducive to fuel fragmentation, atomization and combustion.