| Citation: | YANG Xiaojun, HE Honglin. Prediction and analysis of LTO pollutant emission characteristics of supersonic engine[J]. Journal of Aerospace Power, 2024, 39（8）：20220503 doi: 10.13224/j.cnki.jasp.20220503
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In order to reasonably analyze the pollutant emission characteristics of the supersonic engine during the landing and take-off (LTO) cycle, a supersonic engine model based on the CFM56-7B27 engine core was built. The emission index (EI) of LTO pollutants was calculated by establishing an emission calculation model, and the emission characteristics were analyzed; the influences of pollutant emission characteristics in climb and idle phases on the LTO supersonic mode standard setting were studied, and then a more representative LTO supersonic mode standard was determined. Results showed that the thrust setting (TS) and time in mode (TIM) in different LTO phases had different effects on pollutant emission characteristics; in the research of LTO standard, the mass of the oxides of nitrogen emitted/rated thrust at 60% of the rated thrust and TIM of 2 min climb point was closer to the supersonic climbing trajectories, and the TS of the idle point can better meet the combustion efficiency requirements limited by the emission characteristics of pollutants (carbon monoxide, unburned hydrocarbons) when it was not less than 10% of the rated thrust. Therefore, it is more reasonable to take 60% of the rated thrust and TIM of 2 min as the climb point standard of the LTO supersonic mode and the TS not less than 10% of the rated thrust as the idle point standard of the LTO supersonic mode.
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