基于分段FOX方法的民航LTO黑碳质量排放清单计算分析

根据民用航空发动机压比提出分段FOX(formation and oxidation)方法,估算民用航空发动机LTO(landing and takeoff)循环黑碳(BC)颗粒质量排放指数,结合航空发动机机场实际运行时间和燃油流量修正,编制了2018年国内某国际机场某周国内民航航班黑碳颗粒质量排放清单。结果表明:考虑燃油流量修正的分段FOX方法对民用航空发动机慢车、进近等低工况的黑碳颗粒质量估算精度较FOX方法提高1~2倍,爬升、起飞等高工况估算值更接近实验值。考虑民航实际运行时间和燃油流量后,2018年此国际机场国内民航进出港LTO循环黑碳颗粒质量周排放量约300 kg,其中B737、A320等中型机离港(起飞和爬升阶段为主)阶段排放贡献超70%。 

Civil aviation LTO black carbon mass emission inventory based on piecewise FOX method

Black carbon (BC) mass emission index and BC mass emission inventory of different domestic airline passenger aircrafts during landing and takeoff (LTO) cycle at a Chinese international airport during a week in the year 2018 were estimated based on the proposed piecewise formation and oxidation (FOX) method, by taking actual operating and fuel flow rates at the airport into consideration. The piecewise FOX method, together with fuel flow rate correction, can improve the FOX estimation accuracy of mass emission index by 1~2 times at lower engine power conditions, i.e. idle and approaching. Meanwhile, the discrepancy between measured and FOX predicted mass emission index values for higher engines powers, including climbing and take off, was mitigated by the proposed piecewise FOX method and fuel flow correction. The weekly LTO cycle BC mass emission from domestic flights of the airport in the year 2018 was around 300 kg, among which medium-range passenger aircrafts, such as B737 and A320, contributed more than 70% of the total BC mass emissions primarily during departure and climb phases.