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문희장(Hee-Jang Moon) 한국추진공학회 2008 한국추진공학회지 Vol.12 No.3
The EP(electric propulsion)is unique in that several energy sources can be utilized to produce the electric energy and that high exhaust velocity can be achieved compared to the conventional chemical propulsion. Though a lot of variety of non chemical propulsion are under study, the fact that the EP’s specific impulse ranges widely from 200s to 500s led most research to concentrate on the electric propulsion research. This paper, therefore, is aimed to introduce the up-todate existing EP family such as electrothermal, electrostatic and electromagnetic thrusters where its operating concepts, characteristics and possible variants are presented for future applications.
접선형 산화제 주입기의 운동량비에 따른 End-Burning 하이브리드 연소기의 연소유동장 해석
민문기(Moon-Ki Min),김수종(Soo-Jong Kim),김진곤(Jin-Kon Kim),문희장(Hee-Jang Moon) 한국추진공학회 2007 한국추진공학회지 Vol.11 No.2
In this study, combustion fields of the end-burning hybrid combustor with tangential oxidizer injectors are examined. Momentum ratio of oxidizer is used as a main parameter to analyse the combustion efficiency with temperature, pressure, swirl velocity and mixture fraction field. It was found that as momentum ratio decreases the overall combustion efficiency is enhanced with the pressure field being insensitive to momentum ratio keeping quasi-uniform distribution. Irrespective to the momentum ratio, annular hot region commonly occurred in the upper combustion chamber where this phenomenon was left for a future improvement to be followed.
문근환,문희장,최주호,김진곤,Moon, Keun-Hwan,Moon, Hee-Jang,Choi, Joo-Ho,Kim, Jin-Kon 한국항공운항학회 2016 한국항공운항학회지 Vol.24 No.4
In this study, reliability prediction of the ignition system of hybrid rocket is performed. The FMECA is preceded to the reliability prediction. To this end, the ignition system is divided into 5 components and 19 potential failure modes. The failure cause and effects are identified and criticality analysis is carried out for each failure mode, in which the criticality number is estimated using the failure rate databases. Among the numbers, the failure modes and components with higher criticality and severity are chosen and allocated with higher weighting factor. The reliability predictions are performed using the failure rate databases, from which the current ignition system is found to satisfy the target reliability.
End-Burning 연소기의 충돌형 산화제 주입기 형상 변화에 따른 연소유동장 해석
민문기(Moon-Ki Min),김수종(Soo-Jong Kim),윤창진(Chang-Jin Yoon),김진곤(Jin-Kon Kim),문희장(Hee-Jang Moon) 한국추진공학회 2007 한국추진공학회지 Vol.11 No.5
The end-burning combustion field using impinging oxidizer injectors are analyzed with tangential type injectors in order to examine their mixing and combustion characteristics. The impinging type showed further improved mixing effect as well as the combustion efficiency compared to the previously studied tangential injector. A novel injector capable of delivering impinging and swirl effect is introduced in this study where it demonstrated that the grain coning effect can be avoided. It was found that the combined impinging and swirling flow would promote the radial mixing rate increasing the residence time and the turbulent intensity. However, the use of the step combustor which may augment the turbulent intensity did not show any notable difference compared to the basic combustor.
팩 베드 형상을 가지는 N<sub>2</sub>O 촉매 점화기의 열적현상
유우준,김진곤,문희장,장석필,You, Woo-Jun,Kim, Jin-Kon,Moon, Hee-Jang,Jang, Seok-Pil 대한기계학회 2007 大韓機械學會論文集B Vol.31 No.4
In this paper, thermal characteristics of a nitrous oxide ($N_2O$) catalytic reactor with packed-bed geometry are theoretically and numerically investigated. Several researchers experimentally presented that catalytic decomposition of $N_2O$ in a packed bed generates about 82kJ/mole in the exothermic reaction. Based on the results they have studied the catalytic decomposition of $N_2O$ in a packed bed to use it not only as a mono-propellant thrust for small satellites but also as an igniter system for hybrid rockets. So we aim to identify important parameters existing in an $N_2O$ packed-bed geometry, and to clarify its critical effect on thermal characteristics of the catalytic igniter using a porous medium approach.