Edge Flame Oscillation at Low Strain Rate Flames

1. 제 목 : Edge Flame Oscillation at Low Strain Rate Flames

2. 연 사 : 박 정 교수(순천대학교 기계우주항공공학부)

3. 일 시 : 2006년 10월 27일 (금) 16:30-17:30

4. 장 소 : 301동 302호

5. 내 용 : Experiments in low strain rate methane-air counterflow diffusion flames diluted with nitrogen have been conducted in order to study the flame extinction behavior and edge flame oscillation in which flame length is less than the burner diameter and thus lateral conductive heat loss in addition to radiative loss could be remarkable at low global strain rates. The critical mole fraction at flame extinction is examined in terms of velocity ratio and global strain rate. Onset conditions of the edge flame oscillation and the relevant modes are also provided with global strain rate and nitrogen mole fraction in fuel stream or in terms of fuel Lewis number. It is observed that flame length is intimately relevant to lateral heat loss, and this affects flame extinction and edge flame oscillation considerably. Lateral heat loss causes flame oscillation even at fuel Lewis number less than unity. Edge flame oscillations, which result from the advancing and retreating edge flame motion of the outer flame edge at low strain rate flames, are categorized into three: a growing-, a decaying-, and a harmonic-oscillation mode. A flame stability map based on the flame oscillation modes is also provided at low strain rate flames. Important contribution of lateral heat loss even to edge
flame oscillation is clarified finally.

6. 연사약력 :
1983-1987 서울대학교 기계공학사
1988-1990 한국과학기술원 기계공학과 석사
1990-1995 한국과학기술원 기계공학과 박사
1995-1996 삼성중공업 기계전자연구소 선임연구원
1997-1998 토호쿠대학 유체과학연구소 객원연구원
1999-2000 한국항공우주연구원 추진기관연구부 선임연구원
2000-현재 국립순천대학교 부교수
2004-2005 미국표준연구소(NIST) BFRL 객원과학자

7. 문 의 : 기계항공공학부 윤 영 빈 교수(☏ 880-1904)