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반규호(Kyu Ho Van),이원준(Won June Lee),박정(Jeong Park),김태형(Tae Hyung Kim),박종호(Jong Ho Park) 한국연소학회 2015 한국연소학회지 Vol.20 No.1
A study on laminar jet flames in coflow air diluted with helium has been conducted to investigate selfexcitations for various propane mole fractions and nozzle exit velocities. The stability map was represented as a function of nozzle exit velocity and fuel mole fraction for propane. The results show that two types of self-excitation were observed : (1) buoyancy-driven self-excitation (hereafter called BDSE) and (2) Lewisnumber induced-self-excitation coupled with (1) (hereafter called LCB) near extinction limit for 9.4 ㎜ nozzle diameter. It was shown that with 0.95 ㎜ nozzle diameter, Lewis-number-induced self-excitation (hereafter LISE) and BDSE could be separated. The differences between the two self-excitations were shown and discussed.
에틸렌 첨가에 따른 메탄 화염점파속도와 화학반응 메카니즘 비교 및 선형, 비선형 모델 평가
반규호(Kyu Ho Van),양재영(Jae Young Yang),박정(Jeong Park),권오붕(Oh Boong Kwon),이대근(Dae Keun Lee),김승곤(Seung Gon Kim),곽영태(Young Tae Guahk),노동순(Dong-Soon Noh),윤진한(Jin Han Yoon),길상인(Sang In Keel) 한국연소학회 2015 KOSCOSYMPOSIUM논문집 Vol.2015 No.12
To measure laminar burning velocity in methane/air/ethylene mixture flame, propagating centrally ignited spherical premixed flame to radial direction was measured by high-speed schlieren images with elevated pressure. In this study, The experimentally measured unstretched laminar burning velocities of methane was compared with GRI mech 3.0 to validate experimental data and choose the radius range, respectively. numerical prediction using the PREMIX code with GRI mech 3.0, USC mech II,, and Wang mech were evaluated through comparison with experimental burning velocity with consideration of extrapolation on linear/nonlinear model.
Variation of Liftoff height with diluents in Laminar Nonpremixed Lifted Flame
Suhyeon Oh(오수현),Kyu Ho Van(반규호),Chun Sang Yoo(유춘상),Oh boong Kwon(권오붕),Suk Ho Chung(정석호),Jeong Park(박정) 한국연소학회 2019 KOSCOSYMPOSIUM논문집 Vol.2019 No.11
With diluents (CO₂, N₂, and He) added to fuel or oxidizer stream, stationary lifted flame in non-premixed laminar coflow-jet has been studied. For CO₂ and N₂ diluted in oxidizer stream, liftoff height significantly increased with diluent mole fraction, while in He-diluted case liftoff height slightly increased. In fuel-diluted stream, liftoff height as adding He and N₂ slightly increased, but CO₂-diluted flame oscillated. To investigate change of liftoff height with diluent mole fraction, laminar burning velocity, effects of diluents, and buoyancy were considered.