Environmental regulations on aircraft, including NOX emissions, have been enhanced over
the past several years. Therefore, technologies for accurately predicting the amount of NOX
emission from the combustor, the emission source of the aircraft gas turbine engine, are very
important. In this study, the effects of the dilution flow balance between the outer and the inner
liners of the combustor and the difference between the single-wall liner and the double-wall liner
on NOX emission performance were predicted using computational fluid dynamics (CFD), and an
experimental verification for those CFD results was performed. The results indicated that the use
of CFD allows qualitative prediction of the flow inside the combustor and NOX emission
performance, and that evenly balancing the dilution flow of the outer and inner liners and the use
of a double-wall liner are effective for reduction of NOX.
