스월-안정화 연소기에서 화염구조와 연소불안정에 대한 연구
Study on Flame Structure and Combustion Instability in a Swirl-Stabilized Combustor
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초록
Flame structure and combustion instability characteristics in a swirl-stabilized combustor were investigated by changing fuel, inlet mean velocity, equivalence ratio, and swirler geometry. Two different premixed gases consisting of air and hydrocarbon fuels (C2H4, CH4) were supplied to a combustion chamber through an inlet section and an axial swirler. Dynamic pressure transducer and ICCD camera with a bandpass filter were used to measure pressure fluctuations and flame structures, respectively. The experimental results showed that the pressure fluctuations significantly increased, accompanied by the flame structure transition under certain conditions. Hollow cone flames were mainly formed under stable combustion, but heat release was distributed near the central axis of the combustion chamber under the combustion instability.
Abstract
Flame structure and combustion instability characteristics in a swirl-stabilized combustor were investigated by changing fuel, inlet mean velocity, equivalence ratio, and swirler geometry. Two different premixed gases consisting of air and hydrocarbon fuels (C2H4, CH4) were supplied to a combustion chamber through an inlet section and an axial swirler. Dynamic pressure transducer and ICCD camera with a bandpass filter were used to measure pressure fluctuations and flame structures, respectively. The experimental results showed that the pressure fluctuations significantly increased, accompanied by the flame structure transition under certain conditions. Hollow cone flames were mainly formed under stable combustion, but heat release was distributed near the central axis of the combustion chamber under the combustion instability.
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