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임재익(Jea-Ik Lim),최영도(Young-Do Choi),임우섭(Woo-Seop Lim),김유택(You-Taek Kim),이영호(Young-Ho Lee) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
Recently, small hydropower attracts attention because of its clean, renewable and abundant energy resources to develop. However, suitable turbine type is not determined yet in the range of small hydropower and it is necessary to study for the effective turbine type. Moreover, relatively high manufacturing cost by the complex structure of the turbine is the highest barrier for developing the small hydropower turbine. Therefore, a cross-flow turbine is adopted because of its simple structure and high possibility of applying to small hydropower. The purpose of this study is to examine the optimum configuration of nozzle shape to further optimize the cross-flow hydraulic turbine structure and to improve the performance. The results show that pressure on the runner blade in Stage 1 and velocity at nozzle outlet have close relation to the turbine performance.
채상일(Chae Sang Il),김병수(Kim Byoung Su),임우섭(Lim Woo Seop),양보석(Yang Bo Suk) 한국소음진동공학회 2012 한국소음진동공학회 학술대회논문집 Vol.2012 No.10
The gas compressor is one of the important machine in the petrochemical industry. It is likely to have high vibration problems due to having large reaction source and structural characteristic. In this paper we analyze the cause of high vibration in the reciprocating compressor and present a solution to this problems. By performing this case study, we confirm the effectiveness of vibration reduction through excitation source changes.
송애희(Song Ae Hee),송진대(Song Jin Dae),임우섭(Lim Woo Seop),양보석(Yang Bo Suk) 한국소음진동공학회 2012 한국소음진동공학회 학술대회논문집 Vol.2012 No.10
This paper presents numerical analysis result of rotor-bearing system of a multi-stage high pressure pump. Especially resonance possibility, stability and damping factor are estimated for a selected commercial multi-stage high pressure pump. The result shows that it is not easy to avoid resonance of rotor-bearing system against main excitation forces which are residual unbalance force and pressure pulsation. This makes damping effect be more important.
최종웅(Jong-Woong Choi),김창구(Chang-Goo Kim),임우섭(Woo-Seop Lim),최영도(Young-Do Choi),이영호(Young-Ho Lee) 한국유체기계학회 2008 유체기계 연구개발 발표회 논문집 Vol.2008 No.-
The head-capacity curves for pumps developed by the pump manufacturer are based on tests of a single pump operating in a semi -infinite basin with no close walls or floors and with no stray currents. Therefore. flow into the pump intake is with no vortices or swirling. However. pump station designers relying on these curves to define the operating conditions for the pump selected sometimes meet the reductions of capacity and efficiency. as well as the increase of vibration and additional noise, which were caused by air-entered flow in the pump station. From this background, the authors are carrying out a systematic study on the flow characteristics of intakes within a sump of pump station model. Multi -intake sump model with anti -submerged vortex device basin is designed and the characteristics of submerged vortex is investigated in the flow field by numerical simulation. In this study, a commercial CFD code is used to predict the vortex generation in the pump station accurately. The analysed results by CFD show that the vortex structure and effect of anti -submerged vortex device.