摘要
为合理地分析超声速发动机在起降着陆(landing and take-off,LTO)循环中的污染物排放特性,构建了基于CFM56-7B27核心机的超声速发动机模型。通过建立排放计算模型计算了LTO污染物排放指数(emission index,EI),并分析了其排放特性;研究爬升和慢车阶段污染物排放特性对LTO超声速模式标准设定的影响,进而确定更具代表性的LTO超声速模式标准。分析结果表明:不同LTO阶段的推力设置(thrust setting,TS)和模式时间(time in mode,TIM)对污染物排放特性的影响存在差异性;在LTO标准研究方面,60%额定推力、2 min模式时间的爬升点氮氧化物的排放质量/额定推力更接近于超声速爬升轨迹,慢车点TS在不低于10%额定推力时更能满足污染物(一氧化碳、未燃烧碳氢)排放特性所限制的燃烧效率要求,因此以60%额定推力、2 min模式时间作为LTO超声速模式爬升点标准、以TS不低于10%额定推力作为LTO超声速模式慢车点标准更为合理。
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 CFM56-7B27engine 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.
作者
杨晓军
何虹霖
YANG Xiaojun;HE Honglin(College of Aeronautical Engineering,Civil Aviation University of China,Tianjin 300300,China)
出处
《航空动力学报》
EI
CAS
CSCD
北大核心
2024年第8期1-12,共12页
Journal of Aerospace Power
基金
中国民航大学中央高校基本科研业务费项目(3122019187)。
