Programs have been initiated by NASA to develop and demonstrate low emission advanced technology combustors for reducing aircraft gas turbine engine pollution. Program goals are consistent with urban emission level requirements as specified by the U.S. Environmental Protection Agency (EPA) and with upper atmosphere cruise emission levels as recommended by the U.S. Climatic Impact Assessment Program (CIAP) and National Research Council. Preliminary tests of advanced technology combustors indicate that significant reductions in all major pollutant emissions should be attainable in present generation aircraft gas turbine engines without adverse effects on fuel con¬sumption. Preliminary test results from fundamental studies indicate that extremely low emission combustion systems may be possible for future gener¬ation jet aircraft. The emission reduction techniques currently being eval¬uated in these programs are described along with the results and a quali¬tative assessment of development difficulty.
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