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RISS 인기검색어
- 검색키워드
- 주제어 : Pre-Mixed Combustor(예혼합 연소기) (검색결과 5 건)
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최원석(Wonseok Choi),김한석(Hanseok Kim),조주형(Joohyeong Cho),김용모(Yongmo Kim),안국영(Kookyoung Ahn),우타관(Takwan Woo) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
The effects of carbon dioxide addition to oxygen have been investigated with swirl-stabilized premixed methane flame in a laboratory-scale pre-mixed combustor. The methane fuel and oxydant mixture gas (CO₂ and O₂) were mixed in a pre-mixer and introduced to the combustor through different degrees of swirl vanes. The flame characteristics were examined for different amount of carbon dioxide addition to the methane fuel and different swirl strengths. The effects of carbon dioxide addition and swirl intensity on the combustion characteristics of pre-mixed methane flames were examined using chemiluminescence techniques to provide information about flow field. The results show that the flame area increases at upstream of reaction zone because of increase in recirculation flow for increase in swirl intensity. The flame area is also increased at the downstream zone by recirculation flow because of increase in swirl intensity which results in higher centrifugal force. The OH and CH radical intensity of reaction zone decrease with carbon dioxide addition because the carbon dioxide plays a role of dilution gas in the reaction zone.
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김한석(Hanseok Kim),최원석(Wonseok Choi),조주형(Juhyeong Cho),안국영(Kookyoung Ahn) 대한기계학회 2009 大韓機械學會論文集B Vol.33 No.5
The present study has experimentally investigated the effects of CO₂ diluted oxygen on the structure of swirl-stabilized flame in a lab-scale combustor. The methane fuel and oxidant mixture gas (CO₂ and O₂) were mixed in a pre-mixer and introduced to the combustor through different degrees of swirl vanes. The flame characteristics were examined for various amount of carbon dioxide addition to the methane fuel and various swirl strengths. The effects of carbon dioxide addition and swirl intensity on the combustion characteristics of pre-mixed methane flames were examined using chemiluminescence techniques to provide information about flow field. The results show that the hot combustion zone increases at the upstream reaction zone because of an increase in the recirculation flow for an increase in swirl intensity. The hot combustion zone is also increased at the downstream zone by recirculation flow because of an increase in swirl intensity which results in higher centrifugal force. The OH and CH radical intensities of reaction zone decrease with carbon dioxide addition because the carbon dioxide plays a role of diluted gas in the reaction zone.
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김한석,이영덕,최원석,안국영 한국수소및신에너지학회 2008 한국수소 및 신에너지학회논문집 Vol.19 No.4
The effects of hydrogen enrichment to methane have been investigated with swirl-stabilized premixed hydrogen-enriched methane flame in a laboratory-scale pre-mixed combustor. The hydrogen-enriched methane fuel and air were mixed in a pre-mixer and introduced to the combustor through different degrees of swirl vanes. The flame characteristics were examined for different amount of hydrogen addition to the methane fuel and different swirl strengths. The hydrogen addition effects and swirl intensity on the combustion characteristics of pre-mixed methane flames were examined using micro-thermocouple, particle image velocity meter (PIV) and chemiluminescence techniques to provide information about flow field. The results show that the flame area increases at upstream of reaction zone because of increase in ignition energy from recirculation flow for increase in swirl intensity. The flame area is also increased at the downstream zone by recirculation flow because of increase in swirl intensity which results in higher centrifugal force. The higher combustibility of hydrogen makes reaction faster, raises the temperature of reaction zone and expands the reaction zone, consequently recirculation flow to reaction zone is reduced. The temperature of reaction zone increases with hydrogen addition even though the adiabatic flame temperature of the mixture gas decreases with increase in the amount of hydrogen addition in this experiment condition because the higher combustibility of hydrogen reduces the cooler recirculation flow to the reaction zone.
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정찬영(Chanyeong Jeong),신재익(JaeIk Shin),윤영빈(Youngbin Yoon) 한국추진공학회 2013 한국추진공학회 학술대회논문집 Vol.2013 No.5
보염기가 장착된 덕트형 연소기에서 화염의 희박 날림 현상을 이해하기 위해 화염의 동특성에 대한 실험적 연구를 수행하였다. 연소기는 길이방향으로 긴 덕트형 모양을 가지고 있고 단면은 정사각형이다. 보염기는 정삼각형 구조를 가지고 있다. 연료로는 메탄이 주성분인 도시가스를 사용했다. 화염 날림 현상이 발생하는 당량비는 레이놀즈수와 비례하여 증가하게 되며, 재순환 영역의 규모에 따라서 당량비 값이 변화한다. 화염이 날림에 가까워질 때, 재순환 영역과 화염은 상당한 변화를 겪지만, 이러한 현상이 바로 날림 현상으로 이어지지는 않는다. 날림 현상이 발생하기 적전에는 미연 가스가 재순환 영역으로 강하게 유입된다. 이로 인해 화염의 국소 소멸이 발생하고 보염기 후류의 재순환 영역은 완전히 붕괴된다. 결국 연소반응물은 다시 점화되지 못하고 날림 현상이 발생하게 된다. The dynamic characteristics of flame closed to lean blowoff are investigated in the ducted combustor with the bluff body. The combustor has a long duct shape and rectangular cross-section. Bluff body takes the shape of an equilateral triangle. Methane was used as fuel. The blowoff equivalence ratio increase with the Reynolds number. And blowoff equivalence ratio change depending on the extent of the recirculation zone. When the flame closed to blowoff, recirculation zone and flame undergoes a considerable change, but this phenomenon is not directly connected to the blowoff. Shortly before the blowoff, the unburned gas strongly penetrate into the recirculation zone. The flame is disconnected at bluff body downstream and recirculation zone is completely collapsed. The combustible mixture eventually do not ignite and the blowoff occurs.
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박준홍(Jun Hong Park),전충환(Choonghwan),조주형(Juhyeong Cho),심성훈(Sunghoon Shim),김한석(Hanseok Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
The present study has experimentally investigated the hydrogen effects in syn. gas fuel (CO, H2) and oxygen on the structure of swirl-stabilized flame in a lab-scale combustor (10 kW). Different swirlers have been investigated to identify the role of swirl strength to the incoming mixture. The flame stability was examined for the effect of hydrogen in syn gas fuel with different swirl strengths. This was carried out by comparing adiabatic flame temperatures at the lean flame limit of diluted CO2 gas flow rate. The combustion characteristics of the CO2 diluted syn. gas fuel flames have been examined at constant heat load but different swirl strengths with chemiluminescence diagnostics that provided information on structure of flame zone, respectively. The results show that the lean stability limit is not depend on swirl strength but extended by hydrogen additions. The chemiluminescence intensity is increased with increase of CO concentration because of CO2 chemiluminescence of flame. OH chemiluminescence intensity is diluted with increase of swirl strength by the internal recirculation flow.
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