Aviation and the Global Atmosphere

Aviation and the Global Atmosphere
Aviation and the Global Atmosphere
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7.5.4.2 Near-Term Technology
7.5.4.2.1. General issues
Other reports in this collection
Heightened interest in engine emissions has had a considerable effect on the approach to combustor development over the past 25 years. As with other key fields of
gas turbine technology, earlier dependence on semi-empirical and semi-analytical models has been lessened by advances in CFD methods of modeling and analyzing
complex flow processes (Mongia, 1994, 1997a). Nevertheless, the complexity of the problems dictates that experimental verification is still required to demonstrate that
the combustor meets all emissions, operational performance, and durability requirements. As experience and confidence in these approaches grow, the high costs of
combustion system development might be contained-or even reduced slightly. At present, however, modeling is not expected to completely replace experimental
testing, especially in the case of more advanced, low-emission concepts for which experience is limited. Thus, the pursuit of advances in combustor technology will
remain a major part of the cost of any new engine. A summary of current modeling capabilities, limitations, and potential improvements is given elsewhere (Mongia,
1997a).
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