In-flight measurements of cruise altitude nitric oxide emission indices of commercial jet aircraft

摘要

Simultaneous in-situ NO and CO(sub 2) measurements on board the DLR Falcon research aircraft in the exhaust plumes of commercial short to medium range jet aircraft are used to determine lower limits for the NO(sub x) emission indices EI(NO(sub x)) for cruising conditions. Concentration enhancements for NO and CO(sub 2) of 9 to 33 ppbv and 4 to 14 ppmv, respectively, relative to ambient background concentrations were observed in the exhaust trails 40 s to 130 s after emission. The derived EI(NO(sub x))-limits range between 6.4 to 11.7 g/kg. Though the NO(sub 2) fraction in the exhaust plumes has not been measured during these pilot investigations, arguments are given that the derived lower limits represent a close approximation to the EI(NO(sub x)) values. Within the present uncertainties they are in agreement with predictions based on ground-based engine test data. (orig.)