Pollutant engine emissions are of growing interest to air-framers. Based on the methodology for aircraft system fuel prediction SysFuel, the paper presents an extension to this methodology to analyse the impact of aircraft and aircraft systems on the pollutant emissions carbon monoxide (CO), carbon dioxide (CO2), unburned hydrocarbons (UHC) and oxides of nitrogen (NOx). The paper also shows the impact of changes in cruise altitude and flight velocity on these emissions. On aircraft level, lower cruise altitudes did not lead automatically to less emissions. A decrease in the cruise Mach number led to less emissions for most mission ranges in the simulations. However, under a certain critical value, the decreased Mach number caused increases for some pollutant emissions for long distance missions. In these cases, the lower emission mass flow is nullified by the longer flight duration. A reduction in the cruise Mach number led to decreased NOx emissions for all mission ranges within the assessed Mach number range. On system level, reductions of mass and power consumption of aircraft systems reduce fuel burn and emissions. On engine level, engines with increased bypass ratio to achieve better specific fuel consumption values resulted in higher NOx emissions. The decrease in fuel consumption was not enough to equalize the increased emission indexes.
A methodology for prediction of pollutant emissions due to aircraft systems
Ein Verfahren zur Vorbeugung von Schadstoffemissionen, verursacht durch Flugsysteme
ITEE, International ICSC Symposium on Information Technologies in Environmental Engineering, 2 ; 568-582
2005
15 Seiten, 15 Bilder, 4 Tabellen, 6 Quellen
Conference paper
English
Role of NAPCA in Controlling Aircraft Pollutant Emissions
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|Regulation of Pollutant Emissions from Aircraft - Today and Tomorrow
SAE Technical Papers | 1971
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