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전성민,윤석환,최창호,Jeon, Seong Min,Yoon, Suk-Hwan,Choi, Chang-Ho 항공우주시스템공학회 2015 항공우주시스템공학회지 Vol.9 No.1
A critical speed analysis of oxidizer pump was peformed for a 7 ton class liquid rocket engine as the third stage engine of the Korea Space Launch Vehicle II. Based on the previously developed experimental 30 ton class turbopump and presently developing 75 ton class turbopump for the first and second stage rocket engine of Korea Space Launch Vehicle II, a layout and configuration of the 7 ton class turbopump rotor assembly are determined. A ball bearing stiffness analysis and rotordynamic analysis are performed for both of the bearing unloaded condition and loaded condition. Structural flexibility of the oxidizer pump casing is also included to predict critical speeds. From the numerical analysis, it is confirmed that the rotor system acquires sufficient separate margin of critical speed as a sub-critical rotor even though decrease of critical speed due to the casing structural flexibility.
전성민,이강산,이재랑,김광득,박영옥,Jeon, Seong-Min,Hasolli, Naim,Lee, Kang-San,Lee, Jea-Rang,Kim, Kwang-Deuk,Park, Young-Ok Korean Society for Atmospheric Environment 2016 한국대기환경학회지 Vol.14 No.5
In this study, two kinds of industrial filter bags were tested for their filtration performance to apply the existing bag filter systems. Experimental variables were examined for pressure drop, cleaning interval, residual pressure drop, cleaning efficiency, fractional grade efficiency, total collection efficiency according to the filter bag structure. According to these results, the filter bags tested in this study demonstrated good performance in dust collection. This was also true for the double surface filter bag. The lifetime was longer than the round type filter bag because the filtration area was more than 1.6 times wider and the filter quality factor was much higher. Therefore, double surface filter bags are suggested to be used in order to increase filtration performance of the bag filter systems.
산화제 터보펌프의 구조 강도 및 진동 안전성에 관한 연구
전성민(Seong Min Jeon),김진한(Jinhan Kim),양수석(Soo-Seok Yang),이대성(Dae-Sung Lee) 한국유체기계학회 2001 유체기계 연구개발 발표회 논문집 Vol.- No.-
Structural and dynamic analyses of inducer and impeller for a oxidizer turbopump are peformed to investigate the safety level of strength and vibration at design point Due to high rotational speed of turbopump, effects of centrifugal forces are carefully considered in the structural analysis. Hydrodynamic pressure is also considered as an external force applied to inducer and impeller blades. A three dimensional finite element method(FEM) is used for linear and nonlinear structural analyses with modified Newton-Raphson iteration method. After the nonlinear trim solution is obtained from the structural analysis, dynamic characteristics are obtained as a function of rotational speed from the linearized eigenvalue analysis at an equilibrium position. According to the results of numerical analysis, the safety margins of strength and vibration resonances are sufficient enough to be operated safely within the required life cycle.