双级反旋多点直喷燃烧室燃油分级策略研究

To optimize the scheme of a dual-stage counter-rotating multi-point injection combustor，numerical simulations were employed to study the effects of fuel staging schemes and pilot stage fuel proportions. The feasibility of the research methodology was validated; the emission characteristics of different fuel staging schemes under high and low operating conditions were explored; the impact of pilot stage fuel proportions on combustor performance in the LC (low condition)-3 scheme was investigated. The results showed that the LC-1 and LC-3，with the main nozzles distributed，performed better in overall performance compared with the LC-2 and LC-4 with the main nozzles concentrated. The LC-3 with 6 main nozzles performed better in NOx emissions than the LC-1 with 3 main nozzles， while the LC-1 was slightly better than LC-3 in CO emissions. The LC-3 scheme demonstrated greater overall advantages according to current standards. Under high operating conditions，the HC (high condition) scheme with 9 main nozzles exhibited slightly lower CO emissions but higher NOx emissions compared with the LC-3. In the LC-3，as the pilot fuel proportion increased，both CO and NOx emissions showed an upward trend，and when the pilot fuel proportion reached 25%，the NOx emission reached its lowest value of 1.59×10^-5.