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RISS 인기검색어
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- 저자 : 조준익(Junik Jo) (검색결과 4 건)
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희박예혼합 이중 선회버너에서 역화발생 근처의 유동장 특성
조준익(Junik Jo),김대원(Daewon Kim),이기만(Keeman Lee) 한국추진공학회 2013 한국추진공학회 학술대회논문집 Vol.2013 No.5
본 연구의 목적은 희박예혼합을 이용한 이중 선회버너에서 역화발생 근처의 유동장 특성을 살펴보고자 한다. 파일럿 버너와 메인 버너로 구성된 이중 선회버너에서 파일럿버너는 축방향의 선회기가 설치되었고 메인버너는 접선방향의 선회기를 적용하여 선회수 변화와 당량비 변화에 따른 화염의 안정화영역을 제시하였다. 안정화화염과는 다른 형태를 보이고 있는 역화발생구간에 대해 유동장 특성과 그에 따른 화염특성변화를 알아보고자 자발광 촬영과 초고속카메라 그리고 PIV기법이 적용되었다. 겉보기 역화화염 발생은 입력 열량에 따라서는 비교적 유사한 형태를 보이나, 선회강도에 따라서는 선회강도가 작은 경우 낮은 당량비 구간에서 화염역화가 발생한 반면에 선회강도가 큰 경우 상대적으로 높은 당량비 구간에서 역화가 발생하는 것을 확인하였다. The purpose of this study is a flow field characteristics of near flashback occurrence in a lean premixed dual swirl burner. Pilot burner and main burner installed respectively axis direction and the tangential direction of the swirler, the experiments were conducted. The varied parameters of flame stability were included in the swirl numbers, the equivalence ratios of the pilot and main fuel streams. CH* self luminescence by ICCD camera, high speed camera and PIV system were used to find a flashback characteristics that there were the fatal difference structures. As a result, apparent flame flashbacks are occurred at a relatively low equivalence ratios for low swirl intensity and at high regions for high swirl intensity while the capacity changes depending on the input of the combustor shows similar characteristics.
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이중선회 가스터빈 연소기의 희박-예혼합 화염에 관한 실험적 연구
조준익(Junik Jo),이기만(keeman Lee) 한국자동차공학회 2013 한국자동차공학회 지부 학술대회 논문집 Vol.2013 No.5-1
The purpose of this experimental study is the lean-premixed flame characteristics of dual swirl gas turbine combustor with laboratory scale base. The fuel used here is methane and the varied parameters include in the swirl number and the equivalence ratio of the pilot and main fuel streams in dual swirl combustor configuration. In this study, the stability curves of a dual swirl flame with heat release ratio and heat release rate are proposed. It is found that the blowout and flashback limits are plotted in stability map and flashback mechanism which caused the flame to be entrained into the premixed central recirculation zone is attributed to the combustion induced vortex breakdown(CIVB).
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하이브리드/이중 선회제트 연소기에서 공기 예열온도에 의한 배출 특성 연구
최인찬(Inchan Choi),조준익(Junik Jo),이기만(Keeman Lee) 한국연소학회 2012 KOSCOSYMPOSIUM논문집 Vol.- No.45
The laboratory experiments have been conducted to investigate the effects of air preheated temperature on the emission characteristics by a model gas turbine burner with a hybrid/dual swirl jet flames configuration. The concentration of NOx and CO emissions, and flue gas temperature at combustor exit were measured with varying the equivalence ratio for different air preheated temperatures of 300, 400, 500K at atmospheric pressure. It was overall shown that the NOx and CO emissions, and flue gas temperature were decreased according to the decreasing of equivalence ratio due to the effects of lean premixed combustion regardless of the air preheated temperature. Experimental results of a lean premixed flames configuration indicated that the NOx emission was increased with higher inlet air temperature and air flow rate, which is attributed to the increasing of flue gas temperature and heat release related to the thermal NOx mechanism. But the CO emission was shown the opposite tendency, that is, the CO emissionwas decreased with increasing of inlet air temperature and flow rate.
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SNG 연료의 셀 불안정성 및 층류연소속도에 관한 실험적 연구
김동찬(Dongchan Kim),조준익(Junik Jo),이기만(Keeman Lee) 한국연소학회 2015 KOSCOSYMPOSIUM논문집 Vol.2015 No.12
This article describes a cellular instability and laminar burning velocity of simulated synthetic natural gas(SNG) including 3% hydrogen. In this study, experimental apparatus is employed using cylindrical bomb combustor, and investigation is carried out with high speed camera and Schlieren system. The cellular instability is caused by the buoyancy, hydrodynamic instability. Unstretched burning velocity can be determined by extrapolated stretch rate of zero point from measured results. These results were also compared with numerical calculation by Chemkin package with GRI 3.0, USC-II, WANG, C3 Fuel mechanism. As an experimental conditions, equivalence ratios was adjusted from 0.8 to 1.3. From results of this work, the one was found that the cellular instability has occurred by effect of thermal expansion rate and flame thickness. As the other results, unstretched laminar burning velocity was best coincided with GRI 3.0 mechanism.
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