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이성구(Sunggu Lee),박대종(Daejong Park),권세진(Sejin Kwon) 한국추진공학회 2011 한국추진공학회 학술대회논문집 Vol.2011 No.11
과산화수소와 케로신을 이용한 이원액체추진제 로켓엔진을 위한 산화제 터보펌프를 설계하였으며 수류시험을 통해 설계된 터보펌프의 작동여부를 실험하였다. 과산화수소 터보펌프의 설계조건을 결정하고 펌프의 임펠러를 설계하였다. 펌프를 구동하기 위한 터빈을 차량용 터보차저로 선정하였으며 터빈 맵을 이용하여 가스발생기를 설계하였다. 펌프, 터빈과 가스발생기를 통합하여 터보펌프 시스템을 구축하였으며 수류시험을 통해 터보펌프 시스템이 1.47 bar의 압력으로 3.4 kg/s의 유량을 공급하는 것을 확인하였다. Hydrogen peroxide turbopump was designed for bi-propellant liquid rocket engine using hydrogen peroxide and kerosene as propellants. Turbopump operation was verified through water tests. Design conditions of hydrogen peroxide turbopump were determined, and impeller was designed. Turbine which drives pump was selected from commercial turbocharger. Gas generator was designed by reference from turbine map. Pump, turbine, gas generator were integrated, and turbopump system was constructed. Turbopump supplied water by 1.47 bar of pressure and as well as 3.4 kg/s of mass flow rate.
Manufacturing Process of Micro-drill
Kim, Gunhoi,Lee, Sunggu,Lee, Jeakyung,Kwon, Kyusik 한국공작기계학회 2001 한국공작기계학회 춘계학술대회논문집 Vol.2001 No.-
Resently, reduction of industrial products in size and weight has increased by the application of micro-drill for gadgets of high precision and gave rise to a great interest in a micro-drilling. Due to the lack of tool stiffness and the chip packing, micro-drilling requires not only the robust tool structure which has not affected by the vibration, but also the effective drilling methods designed to prevent tool fracture from cutting troubles. Firstly, this paper presents a new manufacturing process of micro-drill for improving the product rate and an optimum shape of micro-drill for lengthening the tool life, and secondly suggests between tool life and drilling torque acquired in the in process monitoring system.
디지털 풍동을 이용한 대형트럭 측면 오염 개선에 관한 연구
김민호(Minho Kim),권성구(Sunggu Kwon),김우석(Wooseok Kim),최정환(Jeonghwan Choi),김영신(Youngshin Kim) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
The aerodynamic characteristics of heavy-duty trucks have become more and more important in recent vehicle designs. Hence, detailed knowledge of the flow field around vehicle is essential to improved fuel efficiency and reduced dirt contamination on the vehicle body surface. Especially, in the case of trucks driving off-road and on a wet road, dust generated by tire/soil interaction spoils not only the vehicle appearance, but also safety of the field of view because of adhesion to the body surface, side window, and exterior mirror. In this study, in the first step, full scale wind tunnel test was performed to verify the effectiveness of digital wind tunnel. In this stage, prediction results on the aerodynamic coefficients and surface pressure on the front face of trailer were compared with those of wind tunnel test. In the second step, simulation process concerning dirt contamination was also established by using digital wind tunnel with high accuracy. As a result of this study, it is confirmed that the digital wind tunnel results regarding surface pressure and drag force agrees well with those of full scale wind tunnel test. A new simulation process which enables to investigate the practical problems such as dirt contamination is developed.