| Citation: | ZHAO Ruolin, KONG Wenjun. Study on fuel grade strategy for dual-stage counter-rotating multi-point direct injection combustor[J]. Journal of Aerospace Power, 2025, 40（9）：20240359 doi: 10.13224/j.cnki.jasp.20240359
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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.
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