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- 저자 : Sanjar Mamatov (검색결과 5 건)
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Investigation on Leakage Characteristics of Two Kinds of Injection-type Shaft Seals Using CFD
Sanjar Mamatov,Dongwon Shin,Sang-Shin Park 한국유체기계학회 2020 International journal of fluid machinery and syste Vol.13 No.3
Recently, injection-type shaft seals (non-contact type seals) started replacing their counterparts called mechanical seals (contact-face type seals) in power plant feedwater pumps. Both of these seals have primary function of preventing the fluid inside the pump pressure casing from leaking to outside of the pump. Mechanical seals are reported to fail rapidly and abruptly in especially power plant feedwater pumps because of increased speeds and the feedwater temperatures. If mechanical seals fail, most often the pump must be shut-down immediately and put the pump reliability in question. Hence, the injection-type shaft seals were introduced in order to avoid reliability problems associated with mechanical seals and save maintenance costs of feedwater pumps. Therefore, in this paper we investigated the performance of injection-type shaft seals particularly with labyrinth and plain annuls designs. Research findings show that design parameters such as seal clearance and diameter play an important role in determining the injection-type shaft seal’s leakage, while drain temperature was un-affected by these design parameters.
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A study of the performance of a radial diffuser for a multistage high-pressure pump
김덕수,Sanjar Mamatov,전상규,박원규 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.4
In this study, a high-pressure multistage pump used in 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 (D 4 /D 3 ), return channel outlet angel (α 6 ), and pressure recovery factor (C p ). 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 preswirl at the diffuser outlet.
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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.
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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).
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