By Antony Kay
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Extra info for German Jet Engine and Gas Turbine Development, 1930-45
When the inlet temperature is high, the required fuel to generate sufficient heat could lead to high outlet temperatures from combustion chamber, which can in turn increase NOx emissions. Water injection in the compressor inlet can be used to reduce NOx emissions since it allows cooler air to enter the combustion chamber. However, increasing the pressure ratio in gas turbine engines has the potential to increase NOx emissions. The effect can be explained noting the relationship between pressure ratio and temperature rise in the compressor, which is illustrated in Figure 8 for a 100% compressor efficiency.
Aviation and global climate change. uk GAO. ). United States Government Accountability Office website. Retrieved from http://www. gov/ Green, J. E. (2006). Civil aviation and the environment - The next frontier for the aerodynamicist. Aeronautical Journal, 110(1110), 469–486. IPCC. (1999). Intergovernmental Panel on Climate Change- IPCC special report, aviation and the global atmosphere, summary for policymakers (Eds. J. E. Penner, D. H. Lister, D. J. Griggs, D. J. Dokken, & M. McFarland, p.
009T. Nevertheless, NOx formation from combustion is small below a temperature of 1200°C, while it increases notably above 1400-1527°C (Gupta, 1997; Hunecke, 2003; Daggett, 2004). Hence, an almost linear relationship exists between engine power setting and NOx emission. For NO2 emissions from a CFM56-3B1 aircraft, for instance, Wood et al. (2008) notes that 50% of the NOx is emitted below an altitude of 152 m (500 ft) while 25% of the remaining NOx emission is released when aircraft reach 914 m (3000 ft).