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점화시기와 당량비에 따른 리니어엔진의 운전특성과 발전출력에 관한 연구
오용일(Yongil Oh),임옥택(Ocktaeck Lim),김강출(Gangchul Kim),김진복(Jinbok Kim) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
In the future, the compact powerpack was needed because the existing rechargeable batteries cannot provide high energy density and required operational duration. As an alternative, the linear engine was satisfied with compact, durability and had light weight. In this study, prototype ceramic free-piston linear engine combined with a linear alternator was designed to produce electric power for portable usage. It has a bore size of 30 ㎜ and maximum stroke of 33 ㎜. The engine was fueled with liquefied petroleum gas consisting of 98% propane. Its electric power generation performance was tested as a function of the spark timing and equivalence ratio. The equivalence ratio of the mixture was varied from 0.8 to 1.2, while the spark timing was varied as 0.5, 1.0, 1.3, 1.5 and 2,0 ㎳ that the piston passes the first photo sensor. As a result, the maximum electric power was generated when equivalence ratio and ignition timing was 1 and 1.5 ㎳, respectively. Then, the piston velocity was 58㎐.
리니어엔진을 이용한 파워팩의 운전조건에 따른 연소특성과 발전출력의 최적화에 관한 연구
오용일(Yongil Oh),김강출(Jinbok Kim),김진복(Gangchul Kim),임옥택(Ocktaeck Lim) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
The research shows the experimental results of the powerpack for optimization of combustion characteristics and generating power according to operating conditions. The powerpack used in this research consists of 2-stroke linear engine, linear generator and air compressor parts and was used for confirming the generating power. For identifying the combustion characteristics and generating power of linear engine, fuel input calorie, spark timing delay, equivalence ratio, electric load and air gap length was varied respectively. Also generating power was confirmed at each operating conditions. During the all experiments, intake air was inputted under the wide open throttle. Mass flow ratio of air and fuel were changed by using mass flow controller. Thereafter, fuel and air was premixed by the premixture device. The pre-mixed gas was supplied directly into front and rear cylinder of the linear engine. As a result, piston frequency in-cylinder pressure were varied at each conditions according to parameters affecting the combustion such as fuel input calorie, resistive load, spark timing delay and equivalence ratio. Consequently, these had an effect on generating power.