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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >NOX EMISSION INDICES OF SUBSONIC LONG-RANGE JET AIRCRAFT AT CRUISE ALTITUDE - IN SITU MEASUREMENTS AND PREDICTIONS
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NOX EMISSION INDICES OF SUBSONIC LONG-RANGE JET AIRCRAFT AT CRUISE ALTITUDE - IN SITU MEASUREMENTS AND PREDICTIONS

机译：亚音速长距离喷气飞机在巡航高度的NOx排放指数-原位测量和预测

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In the course of the Commissions of the European Communities project ''Pollution From Aircraft Emissions in the North Atlantic Flight Corridor (POLINAT)'', in situ measurements of NO, NOx, and CO2 volume mixing ratios in the near-field exhaust plumes of seven subsonic long-range jet aircraft have been carried out by using the research aircraft Falcon of the Deutsche Forschungsanstalt fur Luft- und Raumfahrt (DLR). For three additional aircraft, only NO and CO2 were measured. Plume ages of 50 s to 150 s have been covered, with maximum observed exhaust gas enhancements of 319 parts per billion by volume and 51 parts per million by volume for Delta[NOx] and Delta[CO2], respectively, in relation to ambient values. Aircraft cruising altitudes and Mach numbers ranged from 9.1 to 11.3 km and from 0.77 to 0.85, respectively. These measurements are used to derive NOx emission indices for seven of the individual aircraft/engine combinations. The NOx emission indices derived range from 12.3 g/kg to 30.4 g/kg. They are compared with predicted emission index values, calculated for the same aircraft engine and the actual conditions by using two newly developed fuel flow correlation methods. The calculated emission indices were mostly within or close to the error limits of the measured values. On average, the predictions from both methods were 12% lower than the measured values, with an observed maximum deviation of 25%. The ratio gamma = [NO2]/[NOx] found during the present measurements ranged from 0.05 to 0.11 for five daytime cases and was around 0.22 for two nighttime cases. BL use of a simple box model of the plume chemistry and dilution these data were used to estimate the initial value gamma(0) present at the engine exit plane. We found gamma(0) values between 0 and 0.15. These were applied to estimate the corresponding NO2 for the three cases in which only NO was measured. [References: 31]
机译：在欧洲共同体委员会项目“北大西洋飞行走廊（POLINAT）的飞机排放污染”过程中，现场测量了近场废气中NO，NOx和CO2的体积混合比。七架亚音速远程喷气式飞机已经使用德国福特雄狮公司（DLR）的Falcon猎鹰飞机进行了飞行。对于另外三架飞机，仅测量了NO和CO2。涵盖了50 s至150 s的羽龄，相对于环境值而言，Delta [NOx]和Delta [CO2]所观察到的最大排气量分别为319十亿分之一体积和51百万分之体积。 。飞机巡航高度和马赫数分别为9.1至11.3 km和0.77至0.85。这些测量用于得出七个单独飞机/发动机组合的NOx排放指数。得出的NOx排放指数范围为12.3 g / kg至30.4 g / kg。通过使用两种最新开发的燃油流量关联方法，将它们与为同一飞机发动机和实际条件计算的预测排放指数值进行比较。计算出的排放指数大多在测量值的误差范围内或附近。平均而言，两种方法的预测值均比测量值低12％，观察到的最大偏差为25％。在当前测量中发现的比率gamma = [NO2] / [NOx]在五种白天的情况下介于0.05到0.11之间，而在两种夜间情况下则在0.22附近。 BL使用羽状化学物质的简单箱型模型并进行稀释，这些数据用于估计发动机出口平面处的初始值gamma（0）。我们发现gamma（0）值介于0和0.15之间。将这些用于估计仅测量NO的三种情况下的相应NO2。 [参考：31]

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