主燃级参数对中心分级燃烧室 NO_x 排放的影响规律研究

For the central graded combustor，the influence of structural parameters such as swirl number，axial velocity at the outlet，and sleeve angle of the main combustion stage，and aerodynamic parameters such as pressure，temperature，oil gas ratio，and classification ratio on NO_x emission are studied through high temperature and high pressure experiments. The results show that when the pre combustion stage works alone，the NO_x emissions of the swirl number of 0.7 in the main combustion stage are the lowest；as the axial velocity at the outlet of the main combustion stage increases，NO_x emissions decrease；within the range of 20°—30°，as the angle of the main combustion stage sleeve increases，NO_x emissions increase. When the main and pre combustion stages work simultaneously，the main combustion stage with the swirl number of 0.9 has the lowest NO_x emissions，while the main combustion stage with an axial velocity of 70 m/s has the lowest NO_x emissions；within the range of 20°—30°，as the angle of the main combustion stage sleeve increases，NO_x emissions decrease.