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RISS 인기검색어
- 검색키워드
- 저자 : Yusuke Araki (검색결과 3 건)
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PI V Measurement of Flow Conditions N ear Casing Tongue of Mini Centrifugal Pump
Toru Shigemitsu,Yusuke Araki 한국유체기계학회 2022 International journal of fluid machinery and syste Vol.15 No.3
Flow conditions near the casing tongue have a s ignificant impact on the performance and stable operation of the centrifugal pump , so the internal flow conditions have been measured by the experiment and PIV measurement. The internal flow conditions of mini centrifugal pumps especially smaller than 100m m are less measured by PIV measurement and its flow conditions near the casing tongue are not clarified yet . Therefore, PIV measurement was conducted near the casing tongue for the mini centrifugal pump having 55mm impeller diameter. The two dimensional op en impeller with the large blade outlet angle 2 =60° was selected as the test impeller. FlowMaster Stereo PIV by LaVision was used for the PIV measurement and the whole test section was made of the acrylic resin including the test impeller. Two CCD camera s with its resolution 2048×2048 pixels were use d and velocity vector and contour were calculated by the PIV measurement software DaVis(Lavision). The internal flow conditions near the casing tongue were focused in this research. The PIV measurement results at different flow rates were shown and the ton gue flow angle was defined to clarify the flow condition near the casing tongue with the impeller rotation. With the increase of the flow rate, the tongue flow angle increases which means the flow near the casing tongue is discharged to the casing throat. In the present paper, the internal flow near the casing tongue is clarified by PIV measurement results and the flow conditions with the impeller rotation are discussed.
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Toru Shigemitsu,Eito Nakaishi,Machi Maeda,Yusuke Araki 한국유체기계학회 2021 International journal of fluid machinery and syste Vol.14 No.1
There are many kinds of the fluid food transportation pumps depending on the characteristics of the fluid, i.e. a sanitary pump made from stainless steel, a screw pump and so on. A centrifugal pump was adopted as a fluid food pump in this research because it makes the stable continuous transportation of fluid food and the structure of the pump is simple compared to positive displacement pumps. The purpose of this research is to investigate the influence of the blade number on the pump performance and internal flow to enrich the pump design data for low viscous fluid food. The centrifugal pump with an open impeller was used and six impellers having the different blade number were prepared. Performance test using an experimental apparatus was conducted and the numerical analysis was also carried out. In the numerical analysis, the commercial software ANSYS-CFX16.2 was used. The head, shaft power and efficiency obtained by the numerical analysis, are almost the same with the experimental results. The head and shaft power increase with the increase of the blade number. The shear rate, which is concerned to fluid food quality, is high near the inlet region of the blade-to-blade passage for all types of blades. The shear rate of each type of the blade is discussed based on the numerical analysis results and relations between the blade number and shear rate are clarified.
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