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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.
행정 프리피스톤 리니어엔진의 운전조건에 따른 동적 및 연소특성에 관한 연구
오용일(Yongil Oh),김강출(Gangchul Kim),임옥택(Ocktaeck Lim),정재훈(Jaehoon Jung) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
The research shows the experimental results for a free piston linear engine according to operation conditions of the linear engine and the structure of linear generator for generating electric power. The powerpack used in this paper consists of the two-stroke free piston linear engine, linear generators and air compressors. Each parameter of fuel input heat, equivalence ratio, spark timing delay, electrical resistance and air gap length were setup to identify the combustion characteristics and to examine the performance of linear engine. The linear engine was fueled with propane. In the course of all linear engine operations, intake air was inputted under the wide open throttle state. Air and fuel mass flow rate were varied by using mass flow controller and these were premixed by pre-mixing device. Subsequently, pre-mixture was directly supplied into each cylinder. Through the experiments, some facts that the generating power was induced differently at each operation conditions of linear engine were confirmed. In the linear engine, ultimately, piston frequency, velocity and combustion characteristics were different at each operating conditions. As a result, the piston frequency was and maximum generating power was 57.2 Hz and 111.3 W under the operating condition of 1.0 of equivalency ratio, 1.5ms of spark timing delay, 30 Ω of electric resistance and 1.0mm of air gap length, respectively.
리니어 엔진의 스프링 강성이 연소 및 동적 특성에 미치는 영향에 관한 연구
이재완(Jaewan Lee),오용일(Yongil Oh),김강출(Gangchul Kim),손병훈(Byounghoon Son),임옥택(Ocktaeck Lim) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
This study was experimentally investigated the effects of the spring stiffness on top dead center(TDC), combustion and dynamic characteristics of two-stroke free piston linear engine. The linear engine generator power was increased by the engine speed(Hz). Using the high spring stiffness decreases stroke and increases the engine speed. In this study, using the Linaer engine on dual piston type. It has a bore size of 30mm and maximum stroke of 31mm. The effective stroke volume of each cylinder is 25.45CC. Stiffness of the spring 1.00 [N / mm], 2.9 [N / mm], 4.9 [N / mm], 14.7 [N / mm] was a variable. The engine was fueled with pre-mixture of LPG(butane 70% propane 30%) and air.
압축기-연소실 일체형인 리니어엔진에서 스프링 강성에 따른 연소 및 동적 특성 연구
이재완(Jaewan Lee),오용일(Yongil Oh),김강출(Gangchul Kim),임옥택(Ocktaeck Lim) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
This study was investigated experimentally on the effects of the stiffness of springs applied to linear compressor chambers. The applied springs could prevent to conflicting between engine piston head and engine head cover as well as be available saving the regenerative energy. The bore size of linear engine is 30 ㎜, the maximum stroke is 31 ㎜ and effective stroke volume of a cylinder is 25.45 ㏄ respectively. The spring stiffness were varied such as 0, 0.5, 1.00, 2.9 and 14.7 N/㎜. The linear engine was fueled with pre-mixture combined with LPG (propane 99%) and air. As an experimental result, when the high spring stiffness was used, the stroke was more increased and also the piston frequency was increased too. Also, increasing the spring stiffness, the regenerative energy and piston velocity were more increased. Because of these results, it thought that the efficiency of linear engine was increased.
발전용 리니어엔진의 컨덕턴스에 따른 동적특성 및 연소특성에 관한 연구
이재완(Jaewan Lee),오용일(Yongil Oh),김강출(Gangchul Kim),임옥택(Ocktaeck Lim),양지웅(Jiwoong Yang) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
Linear engine has the advantage in the volume and weight by the crankless structure. Thus, linear engine was easy to apply linear engine to hybrid vehicles. But linear engine was not commercialized because of difficulty of engine control. This study development Power pack of linear engine. The Power pack that constituted linear engine, compressors and linear alternators was 12.8kg. Fuels of propane delivered combustion cylinder through compressors by a carburetor. The conductance was changed from 0.04 to 0.16mho. And the ignition timing was 5.05mm before maximum stroke. As a result, when the conductance increased, frequency, strok, input calories, maximum pressure and thermal efficiency were decreased trends, and IMEP and electric power were increased trends.