메탄/공기 화염에서 연소실 압력변동이 연소특성과 국소 반응강도에 미치는 영향 (Influence of Changing Combustor Pressure on Combustion Characteristics and Local Reaction Intensity in the CH₄/Air Flames)

서지정보

· 발행기관 : 대한기계학회
· 수록지 정보 : 대한기계학회논문집 B / 33권 / 5호 / 365 ~ 372페이지
· 저자명 : 김종률, 최경민, 김덕줄

초록

The influence of combustor pressure on the local reaction characteristics of CH₄/air flames was investigated by measurements of local chemiluminescence intensity. Induced flow flames are often applied to the industrial boiler systems and incinerator in order to improve heat transfer and prevent exhaust gas leakage. In order to investigate combustion characteristics in the induced flow pattern, the combustor pressure index(P*) was controlled in the range of 0.7∼1.3 for each equivalence ratio in the present combustion system, where P* is defined as the ratio of absolute pressure to atmospheric one. Relationship between local reaction intensity and pressure index have been investigated by simultaneous CH*, C2* and OH* intensity measurements. It could be observed that flame length became longer with decreasing P* from CH* chemiluminescence intensity of axial direction. The mean value of C2* and CH* chemiluminescence intensities, which indicates reaction intensity in the CH4/air flames, decreased with decreasing pressure index for φ≤1, but increased with decreasing pressure index for φ>1. C2*/CH* intensity ratio, which can be a good marker to demonstrate local equivalence ratio, was almost same for φ≤1 regardless of pressure index change, while they showed high level for lower pressure index for φ>1 conditions.

영어초록

The influence of combustor pressure on the local reaction characteristics of CH₄/air flames was investigated by measurements of local chemiluminescence intensity. Induced flow flames are often applied to the industrial boiler systems and incinerator in order to improve heat transfer and prevent exhaust gas leakage. In order to investigate combustion characteristics in the induced flow pattern, the combustor pressure index(P*) was controlled in the range of 0.7∼1.3 for each equivalence ratio in the present combustion system, where P* is defined as the ratio of absolute pressure to atmospheric one. Relationship between local reaction intensity and pressure index have been investigated by simultaneous CH*, C2* and OH* intensity measurements. It could be observed that flame length became longer with decreasing P* from CH* chemiluminescence intensity of axial direction. The mean value of C2* and CH* chemiluminescence intensities, which indicates reaction intensity in the CH4/air flames, decreased with decreasing pressure index for φ≤1, but increased with decreasing pressure index for φ>1. C2*/CH* intensity ratio, which can be a good marker to demonstrate local equivalence ratio, was almost same for φ≤1 regardless of pressure index change, while they showed high level for lower pressure index for φ>1 conditions.

참고자료

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