Wood Ezra C, Herndon Scott C, Timko Michael T, Yelvington Paul E, Miake-Lye Richard C
Aerodyne Research, Inc., 45 Manning Road, Billerica, Massachusetts 01821, USA.
Environ Sci Technol. 2008 Mar 15;42(6):1884-91. doi: 10.1021/es072050a.
Measurements of nitrogen oxides from a variety of commercial aircraft engines as part of the JETS-APEX2 and APEX3 campaigns show that NOx (NOx [triple bond] NO + NO2) is emitted primarily in the form of NO2 at idle thrust and NO at high thrust. A chemical kinetics combustion model reproduces the observed NO2 and NOx trends with engine power and sheds light on the relevant chemical mechanisms. Experimental evidence is presented of rapid conversion of NO to NO2 in the exhaust plume from engines at low thrust. The rapid conversion and the high NO2/NOx emission ratios observed are unrelated to ozone chemistry. NO2 emissions from a CFM56-3B1 engine account for approximately 25% of the NOx emitted below 3000 feet (916 m) and 50% of NOx emitted below 500 feet (153 m) during a standard ICAO (International Civil Aviation Organization) landing-takeoff cycle. Nitrous acid (HONO) accounts for 0.5% to 7% of NOy emissions from aircraft exhaust depending on thrust and engine type. Implications for photochemistry near airports resulting from aircraft emissions are discussed.
作为JETS - APEX2和APEX3活动的一部分，对各种商用飞机发动机氮氧化物的测量表明，氮氧化物（NOx [三键] NO + NO2）在怠速推力下主要以NO2形式排放，在高推力下以NO形式排放。一个化学动力学燃烧模型再现了观测到的NO2和NOx随发动机功率的变化趋势，并揭示了相关的化学机制。给出了低推力下发动机排气羽流中NO快速转化为NO2的实验证据。观测到的快速转化和高NO2/NOx排放比与臭氧化学无关。在国际民航组织（ICAO）标准着陆 - 起飞周期中，CFM56 - 3B1发动机的NO2排放在3000英尺（916米）以下约占NOx排放的25%，在500英尺（153米）以下约占NOx排放的50%。根据推力和发动机类型，亚硝酸（HONO）占飞机尾气中NOy排放的0.5%至7%。讨论了飞机排放对机场附近光化学的影响。
