Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)
- Volume 22 Issue 7
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- Pages.1022-1029
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- 1998
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- 1226-4881(pISSN)
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- 2288-5324(eISSN)
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A study on the combustion instability in a bluffbody dump combustor
가스터빈 연소기의 화염 불안정성에 관한 연구
- Lee, Byeong-Jun (Yeungnam University) ;
- Preston, L.H. (Pennsylvania State Univ.) ;
- Santavicca, D.A. (Pennsylvania State Univ.)
- 이병준 (영남대학교) ;
- ;
- Published : 1998.07.01
Abstract
The relation of the inlet fuel distribution, velocity, and overall equivalence ratio to the stability of a lean burning no-swirl dump combustor was examined. Premixed or partially premixed natural gas was introduced into the air stream, which flowed to the dump region through an annular inlet pipe. Inlet air was preheated upto 400 deg.C. Combustion instability was observed to occur at higher value of equivalence ratio (> 0.6) as the degree of unpremixedness was increased. Instabilities exhibited a dominant frequency of ~ 500 Hz, which corresponded to a half wave mode of combustor. CH chemiluminescence and pressure fluctuations were in-phase when combustion instabilities occurred. Acetone LIF images revealed that there was a strong fuel concentration gradient across the inlet annulus. Phase resolved OH LIF images showed that inlet fuel distribution was affected by the combustion instabilities.
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