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김봉석(B.S.Kim),권오석(O.S.Kwon),이영재(Y.J.Lee),고창조(C.J.Koh),김종필(J.P.Kim),권철홍(C.H.Kwon) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.6_1
This study was investigated the combustion characteristics of methane-hydrogen-air premixtures with various equivalence ratio, hydrogen supplement rate and initial pressure in a disk-shaped constant volume combustion chamber. The main results obtained from the study can be summarized as follow. The flame propagation processes in near stoichiometric mixture of methane-air are propagated with a spherical shape, but in excess rich or lean mixtures are propagated with a elliptical shape. And, they are changed an instable elliptical shape flame with very regular cells by increasing the hydrogen supplement rate. Also, flame is sluggishly propagated as increased initial pressure in combustion chamber. The combustion characteristics such as volume fraction burned and flame radius are increased by increasing the hydrogen supplement rate, especially at the combustion middle period, but they are slowly increased by increasing the initial pressure. Maximum flame propagation speed is acquired at equivalence ratio of 1.0 - 1.1, and increased by increasing the hydrogen supplement rate, but it is decreased by increasing the initial pressure.<br/>
김봉석(B.S.Kim),권오석(O.S.Kwon),김종필(J.P.Kim),이영재(Y.J.Lee),권철홍(C.H.Kwon),고창조(C.J.Koh),류정인(J.I.Ryu) 한국자동차공학회 1992 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The combustion characteristics in prechamber type constant volume com-bustion chamber are experimentally investigated. It is concluded that the geometric configurations of passsge hole, especially passage hole diameter , passage hole angle, and depth of intake hole, are main facters swaying the characteristics of combustion in main chamber.<br/> <br/>
김봉석(B.S.Kim),권오석(O.S.Kwon),김종필(J.P.Kim),이영재(Y.J.Lee),고창조(C.J.Koh),권철홍(C.H.Kwon) 한국자동차공학회 1994 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1994 No.11_1
This study investigates the combustion characteristics of methane-hydrogen-air premixture, in a constant volume combustion chamber. Primary factors of the combustion characteristics of methane-hydrogen-air premixture are the equivalence ratio and hydrogen supplement rate. In the case of φ = 1.1, maximum combustion pressure and heat release rate have peaks, and they increase as the initial pressure and hydrogen supplement rate increase. The total burning time is also the shortest at the φ = 1.1, it shorten by lowering the initial pressure and by increasing the hydrogen supplement rate. The maximum flame temperature is shown at the φ = 1.0, and increasing the initial pressure and hydrogen supplement rate, it increases. The concentration of NO reveals the highest value at the φ = 0.9, and it increases by increasing the initial pressure and hydrogen supplement rate. It is also found that the limit of lean inflammability of methane-hydrogen-air premixture is greatly widened by increasing the hydrogen supplement rate.<br/>
김봉석(B.S.Kim),권오석(O.S.Kown),김종필(J.P.Kim),이영재(Y.J.Lee),고창조(C.J.Koh),권철홍(C.H.Kwon),류정인(J.I.Ryu) 한국자동차공학회 1994 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The present study was investigated combustion characteristics of methane-air mixtures at stratified charge in a constant volume combustion chamber. The results indicated that even the very lean mixture, which is normally not flammable in single chamber type. could be burned within a comparatively short time by using sub-chamber with stratified charge method. Initial time of pressure increase and total burning times were decreased and maximum combustion pressure was increased as the equivalence ratio of both sub and main chamber (Φs. Φm) approached unity. Specifically, initial time of pressure increase and total burning times were greatly affected rather by the equivalence ratio of sub-chamber than that of main chamber. The maximum combustion pressure was little affected if the total equivalence ratio lies in the same range.<br/>