Aviation and the Global Atmosphere

Aviation and the Global Atmosphere
cruise altitude in the high ozone concentration zone, this high NO x emission would not be acceptable for a supersonic transport. This problem is well recognized, and
there are many research activities throughout the western world to develop ultra-low EI(NO x ) systems. Although the combination of the 5g kg -1 EI(NO x ) goal and high
compressor outlet temperatures may seem formidable, research programs have shown that because of the high altitude, the low absolute pressures in the supersonic
transport combustors allow easier control of the combustion mixing process. Contemporary findings therefore support the likely achievement of this target (Shaw et al.,
1997).
Supersonic transports will also be subject to LTO cycle emissions rules and potential climb/cruise emissions rules in common with other air traffic. In this respect, the
lower combustor inlet temperatures and pressures experienced at take-off will mean that NO x requirements in the airport neighborhood could be met more easily. The
combustion system will be optimized for subsonic climb and cruise as well as supersonic cruise conditions, so attainment of low emissions still requires considerable
effort.
Table of contents | Previous page | Next page
Other reports in this collection
http://www.ipcc.ch/ipccreports/sres/aviation/113.htm (4 von 4)08.05.2008 02:43:51
IPCC Homepage