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[論文] 高速噴出火炎이 燃燒에 미치는 影響에 關한 硏究<br/> [論文] 高速噴出化炎이 燃燒에 미치는 影響에 關한 硏究
정경석(K.S.Jeong),정인석(I.S.Jeong),김응서(E.S.Kim),조경국(K. K. Cho) 한국자동차공학회 1982 오토저널 Vol.4 No.2
To understand the effects of turbulence on combustion, it was experimentally investigated in the combustion chamber with sub-chamber by using pressure record and high speed Schlieren motion picture.<br/> The results show that turbulence can increase the flame propagating rate and there exists a condition under which the total burning time becomes the minimum. And it was also found that there exist three kinds of flame propagating pattern and the total burning time can be reduced with the appropriate selection of sub-chamber size and orifice diameter.
[論文] 分割燃燒室內의 對向噴出火焰의 燃燒特性에 關한 硏究
조경국(K.K.Cho),정인석(I.S.Jeung),정경석(K.S.Jeong) 한국자동차공학회 1987 오토저널 Vol.9 No.4
Combustion characteristics of opposed jet-flames spouting out from dual prechambers of a divided combustion chamber were investigated by using high speed schilieren photography and chamber pressure measurement.<br/> Result shows that opposedjet-f1ames are characterized by the parameter (A_ori/V_p) and there exists a certain critical value of (A_ori/V_p)_c which distinguishes flame propagation patterns in the main chamber. Also higher chamber pressure and shorter total burning time can be derived by adopting this dual prechamber divided combustion chamber, which would lead a possibility of an appropriate combustion method of high load and low emmissions.
[論文] 對向噴出焰 燃燒方式에 依한 NOx 生成低減과 燃燒特性 硏究(Ⅰ)¹
조경국(K.K.Cho),정인석(I.S.Jeung),정경석(K.S.Jeong) 한국자동차공학회 1988 오토저널 Vol.10 No.1
Combustion processor progress and NOx pollutant reduction behavior of opposed-jetflame combustion process in a dual-prechamber-divided-combustion-chamber were investigated by using high speed schlieren photography, chamber pressure measurement, and diluted NOx sampling technique.<br/> Results show that opposed-jet-flame combustion process can motivate considerably higher chamber peak pressure and significant lower NOx emission than any other combustion processes studied simultaneously as the comparison experiments. The combustion process of opposedjet-flames is suggested as so-called 'Internal exhaust gas recirculation' process.
배충식(C.Bae),정경석(K-S.Jeong) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_2
The flow characteristics of five different 4-valve cylinder heads were investigated in a steady flow rig using laser-Doppler velocimetry. The tumble flow of each head with pentroof combustion chamber was quantified by nondimensional tumble number using a tumble adaptor. The formation of tumbling vortex was examined in an optical single-cylinder engine which has windows for in-cylinder LDV measurements. Tumble vortex ratio was estimated from the tumble flow measurement.<br/> The four-valve cylinder heads with pent-roof combustion chamber showed the tumble vortex from the intake process. which was investigated in the steady flow test. The tumble adaptor which converts the tumble into swirl flow was found to be feasible in predicting the tumble flow in the real engine. The tumble strength in the steady flow test coincides with that in the real engine experiment within 15%. It was found that the steady flow test on the four-valve cylinder heads provides the tip for a better design of cylinder head.<br/>
가솔린 엔진의 연료분사시기가 희박연소한계에 미치는 영향에 관한 연구
엄인용(I. Y. Ohm),정경석(K. S. Jeong),정인석(I. S. Jeung) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.6_2
The effects of fuel injection timing on lean misfire limit has been investigated in a sequential MPI SI engine. To investigate the interaction of injection timing and intake flow characteristics, so called axial stratification phenomena, 4 different swirl inducing intake ports have been tested in single cylinder engine test bench. And 2 kinds of fuel, gasoline and compressed natural gas(CNG), were used to see the effect of liquid fuel vaparization. Result shows that the combination of port swirl ratios and injecton timimg governs the lean misfire limit and lean misfire limit envelopes reamain alomost same for a given swirl ratios regardless of engine speed. It is also found that two phase flow has some effects on lean misfire limit ,i.e. axial stratification.<br/>