| Autor: |
Harlass, Theresa, Dischl, Rebecca, Kaufmann, Stefan, Märkl, Raphael, Sauer, Daniel, Scheibe, Monika, Stock, Paul, Bräuer, Tiziana, Dörnbrack, Andreas, Roiger, Anke, Schlager, Hans, Schumann, Ulrich, Schripp, Tobias, Grein, Tobias, Bondorf, Linda, Renard, Charles, Gauthier, Maxime, Johnson, Mark, Luff, Darren, Madden, Paul |
| Předmět: |
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| Zdroj: |
EGUsphere; 2/28/2024, p1-22, 22p |
| Abstrakt: |
Nitrogen oxides, emitted from air traffic, are of concern due to their impact on climate by changing atmospheric ozone and methane levels. Using the DLR research aircraft Falcon, total reactive nitrogen (NOy) measurements were carried out at high altitudes to characterize emissions in the fresh aircraft exhaust from the latest generation Rolls-Royce Trent XWB-84 engine aboard the long-range Airbus A350-941 aircraft. The impact of different engine thrust settings, monitored in terms of combustor inlet temperature, pressure, and engine fuel flow, was tested for two different fuel types: Jet A-1 and for the first time a 100 % sustainable aviation fuel (SAF) under similar atmospheric conditions. During ground emission measurements, a range of combustor temperatures and an additional blended SAF were tested. We confirm that the NOx emission index increases with increasing combustion temperature, pressure and fuel flow. We find that as expected, the fuel type has no measurable effect on the NOx emission index. These measurements are used to compare to cruise NOx emission index estimates from three engine emission models. Our measurements thus help to understand the ground to cruise correlation of current emission models while serving as input for climate modelling, and extending the extremely sparse data set on in-flight aircraft NOx emissions to newer engine generations. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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