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김덕수(Deok Su Kim),산자르(Sanjar Mamatov),박원규(Warn Gyu Park) 대한기계학회 2016 大韓機械學會論文集B Vol.40 No.11
본 연구에서는 복합화력 화력 발전소용 고압 다단펌프의 레이디얼 디퓨저 형상에 따른 펌프의 성능(양정, 효율)변화를 수치 해석적으로 분석하였다. 레이디얼 디퓨저 설계 변수는 크게 디퓨저 베인수, 디퓨저 외경비(D4/D3), 리턴채널 출구각도(α6), 압력회복계수(Cp) 등으로 선정하였다. 수치해석 결과 디퓨저 외경비가 큰 경우 양정 및 효율이 가장 크게 예측되었으며, 리턴채널의 출구각도(α6)가 60도인 경우 디퓨저 출구에서의 Pre-Swirl로 인해 출구각도가 90도인 것에 비해 양정이 저하되는 것을 알 수 있다. In this study, a high-pressure multistage pump used in the combined cycle power plants is analyzed. The pump performance characteristics (differential head and efficiency) are numerically analyzed for different shapes of the radial diffuser. The design variables selected for the radial diffuser are, number of vanes, diameter ratio (D4/D3), return channel outlet angle(α6), and pressure recovery factor (Cp). The numerical analysis results showed that the differential head and efficiency are the highest when the diameter ratio is the highest. Further, it was observed that the differential head was lower when the return channel outlet angle was 60° than when it was 90°, because of pre-swirl at the diffuser outlet.
고압 다단 펌프의 임펠러 자오면 곡선에 대한 수치 해석적 연구
김덕수(Deok Su Kim),전상규(Sang Gyu Jean),산자르(Sanjar Mamatov),박원규(Warn Gyu Park) 대한기계학회 2017 大韓機械學會論文集B Vol.41 No.7
본 연구에서는 RO용 고압 다단 펌프의 수력 부 성능에 대해서 연구를 수행하였다. 수력 부 설계는 크게 임펠러 설계와 레이디얼 디퓨저 설계로 나뉠 수 있다. 임펠러의 자오면 형상 변화에 따른 유동분포와 성능을 수치 해석적으로 연구하였으며, 임펠러 외경, 출구 폭, eye dia 등은 고정시킨 상태에서 반응 표면 기법을 이용하여 허브 및 쉬라우드 자오면 곡선을 변화 시키면서 성능을 최적화하였다. 해석결과 양정에 가장 큰 영향을 미치는 설계 변수는 εDs로 나타났으며 효율은 허브 입구 길이 및 쉬라우드 곡선이 가장 큰 영향을 주는 것을 알 수 있었다. 자오면 프로파일을 변경한 결과 기준모델(case 25)에 비해 약 0.5% 효율이 개선됨을 확인할 수 있었다. This paper presents the hydraulic design an impeller and radial diffuser of a high-pressure multistage pump for reverse osmosis. The flow distribution and hydraulic performance for the meridional design of the impeller were analyzed numerically. Optimization was conducted based on the response surface method by varying the hub and shroud meridional curvatures, while maintaining the impeller outlet diameter, outlet width, and eye diameter constant. The analysis results of the head and efficiency with the variation in the impeller meridional profile showed that angle of the front shroud near the impeller outlet (εDs) had the highest effect on head increase, while the hub inlet length (d1i) and shroud curvature (Rds) had the highest effect on efficiency. From the meridional profile variation, an approximately 0.5% increase in efficiency was observed compared with the base model (case 25).
해양 플랜트용 고압 다단 Water Injection Pump의 수치 해석적 연구
김덕수(Deok Su Kim),전상규(Sang Gyu Jean),박원규(Warn Gyu Park),최현철(Hyeon Cheol Choi) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
In this Paper, the optimization of the impeller was carried out in order to improve the performance a high pressure multistage pump. Design parameter from vane angle distribution for impeller design were selected, and effort of the design parameter on the performance of the pump was analyzed by using Response surface Methodology(RSM) to optimized impeller. For optimized guide vane, impeller optimization was performed based on modified Gulich’s formulae.
100 kW 급 수직형 다단 펌프의 실험과 CFD 해석에 관한 연구
박세진(Se-Jin Park),이명성(Myungsung Lee),김주한(Joo-Han Kim ),윤인식(Yoon In-Sik) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
The specification of the design model is a 100 kW vertical multi-stage pump with a flow rate of 200 ㎥/h, a head of 95 m, a rotation speed of 3600 r/min, and an outer diameter of an impeller of 168.5 mm. The pump performance test was conducted with the bench marketing model to confirm the P-Q performance data and to verify the accuracy of the analysis by comparing it with the analysis data using computational fluid dynamics. As for the number of grids, a tetrahedral grid of about 16 million nodes and 58 million elements was created. The rotational area was simulated using the MRF (Moving Reference Frame) technique. We want to check the pressure and velocity distribution for the internal flow by numerical analysis. Through this study, we plan to secure systematic and reliable technical data by accumulating analysis techniques for flow analysis.
Ming Guo,최영도 한국유체기계학회 2019 한국유체기계학회 논문집 Vol.22 No.3
As it has been proven, the design of impeller meridional shape directly influences the performance of multistage centrifugal pump. In this study, the five parameters of the double-arc meridional shape design method were selected as the design variables. A multi-point hydraulic optimum design method of impeller meridional shape for multistage centrifugal pump performance improvement was presented. The maximum hydraulic efficiency and effective head were chosen as the objective functions. The design of experiment method was applied to generate different impeller meridional shapes and a total of 50 sampling models were generated using the Latin Hypercube Method. The Reynolds Average Navier Stokes equations were adopted to conduct the numerical calculations. To validate the performance improvement of the optimal design model, efficiencies of the optimal design model at flow rates of 0.8Qref, 1.0Qref, and 1.2Qref were compared with the original reference model. The optimal efficiencies under the three operation conditions increased by 1.9%, 1.6%, and 0.9%, respectively. In addition, the CFD analysis of a two-stage multistage pump assembled by impellers, continuous diffuser and return vanes was conducted. The cavitation performance was also validated.