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[論文] 스파아크 점화기관의 흡기습도에 대한 화염속도 및 연소의 변화
김문헌(M.H.Kim),이성열(S.Y.Lee) 한국자동차공학회 1983 오토저널 Vol.5 No.4
The influence of inlet air humidity on the flame velocity and combustion of the spark ignition engine were described experimentaUy by means of the flame velocity measuring apparatus using ion-current. The flame velocity are greatly influenced air fuel ratio and engine speed, and linealy decrease according to the increasing of inlet air humidity.<br/> The flame travell curve is very similar to the rate of mass burned and combustion progressive is estimated mostly by only the rate of mass burned curve.<br/> The decreasing of the mean flame velocity is about 0.4m/s for increasing of 0.001 specific humidity and we think the reason is mainly decreasing of thermal conductivity.
김문헌(M. H. Kim),오병욱(B. W. Oh) 한국자동차공학회 1994 한국 자동차공학회논문집 Vol.2 No.2
In this study the behavior of engine cooling loss and overall heat transfer coefficient were studied experimentally using naturally aspirated engine and turbo charged engine.<br/> Using turbo charging, heat dissipation was increased because of the density of the mixture was increased with increment of inlet air flow rate.<br/> Therefore, cooling loss of turbo charged engine is larger than naturally aspirated engine.<br/> As taking the measurement of surface temperature of combustion chamber, gas heat transfer coefficient was calculated and found that it has greatly affected to overall heat transfer coefficient.<br/> The empirical formula of overall heat transfer coefficient established in order to predict of engine cooling loss and express only as a function of mean piston velocity.<br/>
[論文] 흡입습도가 스파아크 점화기관의 연소과정에 미치는 영향
김문헌(M. H. Kim),이성열(S. Y. Lee) 한국자동차공학회 1983 오토저널 Vol.5 No.2
The analysis shows that the variation of maximum pressure of the cycle, rate of heat release, rate of mass burned, and combustion delay are influenced by the inlet air humidity in the spark-ignition engine.<br/> The quantitative combustion delay can be obtained from the rate of mass burned. Also, the variation of time loss and effective compression ratio with the change of inlet air humidity are<br/> dominated by the development of rate of heat release.
김문헌(M. H. Kim),김영호(Y. H. Kim),이종태(J. T. Lee) 한국자동차공학회 1995 한국 자동차공학회논문집 Vol.3 No.6
The effect of turbulence and ignition energy on flame kernel growth in mathanol-air mixtures has been studied in a constant volume vessel. Experiments were made under different turbulent intensity conditions, ignition energy and over a range of equivalence ratio. Characteristics of turbulence flow were grasped by measurments of gas pressure and visualization of flame propagation. Flow velocity was measured by use of hot wire anemometer. A comparison of the effect of turbulence on ignition probability and flame kernel volume variation ratio is also presented.
김문헌(M. H. Kim),임연기(Y. K. Lim),이종태(J. T. Lee) 한국자동차공학회 1996 한국 자동차공학회논문집 Vol.4 No.1
Instantaneous surface temperature and unsteady heat flux of intake and exhaust valve in methanol fueled engine were investigated as a function of compression ratio and engine speed. To accomplish this purpose, the instantaneous temperature sensor was designed and it was installed into three point of intake and exhaust valve head to measure unsteady temperature. The unsteady heat flux at valves was evaluated using one dimensional heat conduction equation with the valve head temperature and temperature gradient.<br/> And also mean heat flux of intake and exhaust valve for each stroke were evaluated as a function of engine speed.
[가솔린엔진부문] 상용기관 연소실 형상을 갖는 정적 연소기에서의 플라즈마 제트 점화에 의한 연소특성
류현욱(H.W.Ryu),박정서(J.S.Park),유호선(H.S.Yoo),김문헌(M.H.Kim) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1999 No.11_1
In this paper. combustion characteristics ignited by single-hole and multi-hole plasm jet igniter and conventional spark plug have been studied by means of schlieren photography and pressure measuring in the Pent-roof type and the Toroidal bowl type constant volume vessel which is typical 4-valve 51 engine combustion chamber. It is represented that combustion characteristics ignited by conventional spark plug ignition are hardly influenced by configurations of combustion chamber. In contrast. in case of plasma jet ignition, combustion duration and combustion enhancement rates are effected than spark plug ignition. Consequently. it is important to avoid plasma jet impingement against combustion chamber wall. and to let flame front move toward wide place in the combustion chamber at early stage of combustion
김영효(Y.H.Kim),김문헌(M.H.Kim),이종태(J.T.Lee) 한국자동차공학회 1994 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1994 No.11_1
The effects of turbulent flow characteristics affected on early combustion process in methanol-air mixtures have been stuied in a constant volume vessel. Instantaneous flow velocity, turbulent intensity and turbulent scale were investigated in order to analyze the turbulent flow characteristics. Experiments were made under different turbulent intensity and turbulent scale. A comparison of the turbulent flow characteristics on flame kernel volume and flame kernel volume variation ratio is also presented.<br/>
직접분사식 디젤 연소실 벽면에서의 열유속에 미치는 메탄올 혼입의 영향
김영호(Y.H. Kim),오병진(B.J.Oh),방정서(J.S. Park),기학영(H.Y.Kim),김문헌(M.H.Kim),이종태(J.T.Lee) 한국자동차공학회 1993 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The effect of methanol fumigation on heat flux in combustion chamber wall of direct injection diesel engine have been investigated. The instantaneous surface temperature and heat flux of combustion chamber wall are decreased according to<br/> increase methanol fumigation. Maximum heat flux at methanol<br/> volume ratio 30% decrease 2.3 MW /㎡ and maximum heat flux reduction rate decrease 39% than that of diesel engine.<br/>