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〈논문〉 수치해석을 통한 액체 CO₂ 조성에 따른 부스터 펌프의 성능 특성 예측
윤현기(Hyungi Yoon),유일수(Ilsu Yoo),박준영(Junyeong Park),박무룡(Mooryong Park),윤의수(Euisoo Yoon) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.5
Booster pump is used for storing liquid CO₂ into the marine or ground geological structure. The booster pump in this study is a centrifugal type with volute and' has a non-dimensional specific speed of 0.25. The hydraulic performance of this pump is investigated numerically by using the commercial code CFX. k-w based SST turbulent model is used to simulate the 3-D turbulent flow.
윤현기(Hyungi Yoon),유일수(Ilsu Yoo),박준영(Junyeong Park),박무룡(Mooryong Park) 한국유체기계학회 2008 유체기계 연구개발 발표회 논문집 Vol.2008 No.-
Multi-stage centrifugal pump is widely used over a variety of industrial field such as power and chemistry plant because of its space efficiency and high exit pressure. The 1<SUP>st</SUP> stage pump performance of the multi -stage centrifugal pump is especially important because it is generally composed of the several pumps which are the same geometry along the same shaft. And return channel is used as a connecting passage between the each pump. In the present study, to find out the loss distribution, hydraulic performance and cavitation characteristic, the 1<SUP>st</SUP> stage pump composed of impeller, diffuser and return channel has been investigated numerically by using the k-ω based SST turbulent model, homogeneous flow model and Rayleigh Plesset cavitation model. The power efficiency, total head raise and HPSHR is 0.88, 129m and 2.84m at the designed point, respectively. The numerical analysis of the cavitation characteristic was studied in case of three different calculation models and it was confirmed that only impeller part is needed to find out the cavitation feature in the 1<SUP>st</SUP> stage pump which includes the return channel.
윤현기(Hyungi Yoon),박무룡(Mooryong Park),유일수(Ilsu Yoo),황순찬(Soonchan Hwang) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
The operating cost is highly affected by a small difference of pump efficiency around 1~2% in a high capacity pump. So, the detailed revision of the design is required. In the present study, the pump performance has been investigated experimentally and numerically with a change of a stagger angle. The axis of rotation of the stagger angle is placed at the center of the sectional area of the blade between the hub and shroud. The stagger angle is set as -2, -1, 1 and 2 degree from the original design. Performance analysis of each stagger angle is achieved with various flow rates. Cavitation characteristic is also studied at this time. The impeller and diffuser have been investigated numerically by using the commercial code CFX, k-w based SST turbulent model, homogeneous flow model and Rayleigh Plesset cavitation model. It shows good performance that the stagger angle is one degree. Its performance is very similar with the original design near the design point, but better than 2~3% at the high flow rate. The result of the cavitation characteristicshows that the net positive section head (NPSH) is lower than 10% compared with the original design.