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초소형 위성 군집 시스템 구축을 위한 민간항공기 기반 공중발사체 임무설계
심주현(Juhyen Sim),박주원(Juwon Park),홍용기(Yonggi Hong),이광원(Kwangwon Lee),신진영(Jinyoung Shin),박재필(Jaephil Park),이승현(Seunghyeun Lee),손택준(Taekjoon Son) 한국추진공학회 2022 한국추진공학회 학술대회논문집 Vol.2022 No.5
최근 민간 우주개발 사업이 활성화되면서 민간 우주개발 분야 중 하나인, 초소형 위성 군집 시스템을 활용한 인공위성 정보서비스 분야도 많은 시도가 이루어 지고 있다. 이에 따라 초소형 위성 군집 시스템의 요구사항을 충족할 수 있는 공중발사 서비스에 대한 관심도 늘어나고 있는 상황이다. 초소형 위성 군집 시스템 설계를 통해 공중발사 서비스 임무목표를 설정하고, 이에 대한 임무설계를 수행하였다. 2단형 공중 발사체를 활용하여 3톤급 액체엔진을 1단에 9기, 2단에 1기를 각각 장착하여, 고도 약 10km 높이에서 초기 상승각 30° 조건에서 공중발사체를 통한 임무 수행 가능성을 시뮬레이션을 통해 검토하였다. Recently, as the many kind of private space project has been activated, many attempts are being made in the field of satellite information service using a microsatellite clustered system. Accordingly, air-launched services that can meet the requirements of microsatellite clustered systems. Through the microsatellite cluster system design, the air launch service mission goal was set and performed. Using a two-stages air launch vehicle with nine 3-ton liquid engines in the 1st stage and one in the 2nd stage, the possibility of mission performance was simulated at an initial elevation angle of 30° at an altitude of about 10 km.
아마추어 소형로켓 점화기 성능 향상을 위한 실험적 연구
심주현(Juhyen Sim),임승빈(Seungvin Lim),박상섭(Sangsub Park),박완주(Wanju Park),이진성(Jinsung Lee),최재원(Jaewon Choi),홍주현(Juhyun Hong),채재우(Jaeou Chae) 한국추진공학회 2008 한국추진공학회 학술대회논문집 Vol.2008 No.5
현재 인하 로케트 연구회에서는 소형 로켓 모터 점화를 위해 흑색화약 및 PVA수지를 혼합하여 점화기를 제작하고 있다. 하지만 제작 과정의 모호함으로 인해 그 성능이 일정하지 않아, 점화기로서 부족한 점으로 지적되고 있다. 따라서 흑색화약 및 PVA수지의 혼합비에 따른 연소 특성을 파악하여 추진제 점화기 요구 조건 충족 조건을 실험적으로 확인하였다. 특히 추진제 점화기의 요구 조건인 추진제 점화 온도 및 안정 연소 압력 조성에 대하여 중점적으로 다루었으며, 산화제와 연소 촉매의 비율에 따른 연소 가스의 온도 및 압력 변화를 통해 그 경향성을 알 수 있었다. Inha Rocket Research Institute has made the igniter that is combination of black powder and PVA polymer for ignition small rocket. But recent igniter is not satisfy because of the performance of igniter is not identified. So, we confirmed requirement of igniter by comparing of ratio of black powder and PVA through experimental method. Especially we studied with ignition temperature for propellant and stable combustion pressure that is requirements of propellant. We can know the tendency of combustion properties by ratio of oxidizer and combustion catalyst through changing of temperature and pressure of exhaust gas of igniter.
기계식 디젤엔진의 디젤-천연가스 혼소화를 통한 디젤 대체율 향상 연구
심주현(JuHyen Sim),곽용환(Yonghwan Kwak),고춘식(Chunsik Ko),이욱재(Okjae Lee),이상민(Sangmin Lee),이창언(Chang-Eon Lee) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
An experimental study was performed to provide the effect of PM reduction and the improvement of diesel alternative ratio utilizing diesel-natural gas dual-fuel combustion mode in a retrofit 3.4-liter diesel engine. In order to achieve the same power as the original diesel engine, engine control unit (ECU) of the dual-fuel engine was calibrated. During this calibration, the amount of diesel fuel injection was fixed same as the amount in the idle state for all engine load conditions and liquefied natural gas (LNG) fuel injection was adjusted to increase power based on the power in idling state. LNG fuel was injected by a single point injection at the inlet of intake air manifold. As a result, diesel alternative ratio was improved in overall through making up the characteristic of lower diesel fuel consumption in comparison with mechanical diesel engine. Diesel alternative ratio was calculated from the experimental data acquired from full load test. It was found that the maximum value of diesel alternative ratio was about 96%. Finally PM emission experiment was performed in C1-8 mode cycle and it was shown PM emission was extremely reduced down to 7.42*10<SUP>-7</SUP> g/kWh comparing with mechanical diesel engine. From these results we believe our dual-fuel engine could meet Tier-4 regulations.
심주현(Juhyen Sim),고춘식(Chunsik Ko),이상민(Sangmin Lee),이옥재(Okjae Lee),이창언(Chang-Eon Lee) 한국연소학회 2012 KOSCOSYMPOSIUM논문집 Vol.- No.45
An experimental study was performed to provide the effect of PM reduction and the improvement of diesel alternative ratio utilizing diesel-natural gas dual-fuel combustion mode in a retrofit 3.4-liter diesel engine. In order to achieve the same power as the original diesel engine, engine control unit (ECU) of the dual-fuel engine was calibrated. As a result, diesel alternative ratio was found that the maximum value of diesel alternative ratio was about 96%. Finally PM emission experiment was performed in C1-8 mode cycle and it was shown PM emission was extremely reduced down to 7.42*10<SUP>-7</SUP> g/kWh comparing with mechanical diesel engine.