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다단연소 사이클 엔진의 파워팩 시동 모사를 위한 해석적 연구
이성훈(Sunghun Lee),조성휘(Seonghui Jo),김홍집(Hongjip Kim),김성룡(SeongRyong Kim),이승재(SeungJae Yi) 한국추진공학회 2019 한국추진공학회지 Vol.23 No.3
In this study, the start-up characteristics of a staged combustion engine were analyzed numerically based on relational equation modeling of the entire engine components. The start-up characteristics were extensively analyzed considering the transient period of the total engine system from the start-up sequence till the steady-state of the engine. The performance characteristics of the engine components such as RPM of engine power-pack, chamber pressure and O/F ratio of pre-burner, and mass flow of propellants in the start-up period were investigated. Furthermore, the calculated engine data were compared satisfactorily with the experimental data. Through the comparison of data, successful validation of present engine start-up analysis has been obtained.
ZnO 박막의 전기적 구조적 특성에 미치는 수소 분압비의 영향
이성훈(Sunghun Lee),신민근(Min-Geun Shin),변응선(Eungsun Byon),김도근(Do-Geun Kim),전상조(Sang-Jo Jeon),구본혼(Bon Heun Koo) 한국표면공학회 2006 한국표면공학회지 Vol.39 No.6
Effect of hydrogen partial pressure ratio on the structural and electrical properties of highly c-axis oriented ZnO films deposited by oxygen ion-assisted pulsed filtered vacuum arc at a room temperature was investigated. The hydrogen partial pressure ratio were 1.4%~9.8% at 40% oxygen pressure ratio. The conductivity of ZnO:H films was increased from 1.4% up to 4.2% due to relatively high carrier mobility caused by improvement of crystallinity. While the conductivity of ZnO:H films were decreased over than 4.2% and (0002) orientation was also deteriorated. The lowest resistivity of ZnO:H films was 2.5 × 10?³ Ωㆍ㎝ at 4.2% of hydrogen pressure ratio. Transmittance of ZnO:H films in visible range was 85% which is lower than that of undoped ZnO films because of declined preferred orientation.