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(과학기술연합대학원대학교) (과학기술연합대학원대학교) (한국기계연구원) (한국기계연구원) (한국기계연구원) (한국기계연구원)
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한국연소학회 한국연소학회지 한국연소학회지 제25권 제4호
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    초록·키워드

    This study investigated the effect of the outer recirculation zone(ORZ) on the combustion characteristics and NO<SUB>X</SUB> emissions. Numerical simulation and experimental test were conducted for the combustors with two types of the burner outlet. The ORZ is formed conspicuously for a flat type with sudden expansion outlet while it is formed in a negligible size for a curved type with gradual expansion outlet. In a higher adiabatic flame temperature(AFT) condition of 2020 K, the NO<SUB>X</SUB> emission of the flat type is increased by 19% compared with the curved type as the ORZ has long residence time and high temperature enough to produce the thermal NO<SUB>X</SUB>. On the other hand, the NO<SUB>X</SUB> emission of the flat type is decreased slightly in a lower AFT of 1850 K as the temperature of the ORZ is not high enough to significantly produce the thermal NO<SUB>X</SUB>. The tendency of the calculated NO<SUB>X</SUB> emission is consistent with the experiment results.

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      UCI(KEPA) : I410-ECN-0101-2021-431-001435428