Effect of pre-combustion stage swirl number on flow and temperature <?A3B2 pi6?>field combustion characteristics in staged chamber

To obtain the combustion characteristics of the flow field and temperature field of the combustion chamber under different swirl numbers, the swirler and combustion chamber models with different structural parameters were established, and the influence of the swirl number of the pre-combustion stage swirler on the combustion characteristics of the flow field and temperature field of the central staged combustion chamber was studied by numerical simulation and parameter adjustment methods. The results show that with the increase of the swirl number of the first stage swirler of the pre-combustion stage, the atomization effect of the swirler on the fuel is enhanced, the central recirculation area also tends to increase, and the maximum temperature of the temperature field tends to increase first and then decrease; with the increase of the swirl number of the second stage swirler of the pre-combustion stage, the atomization characteristics of the swirler are significantly improved, the central recirculation area tends to increase first and then decrease, and the distribution of the temperature field is also better, reflecting that the pre-combustion stage swirler improves the fuel atomization quality and initial mixing state by enhancing the airflow shear effect. Its swirler structure helps to stabilize the flame development and has a positive effect on improving combustion efficiency.