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임펠러 블레이드 형상이 자흡식 진공펌프 성능에 미치는 영향
전형준(Hyung-Jun Jeon),지효근(Hyo-Geun Ji),김윤제(Youn-Jea Kim) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
A self-priming vacuum pump is a hybrid-type pump that combined an axial-type screw pump and a centrifugal pump for better performance and be used in various industrial fields treating multiphase fluids such as slurry. The performance of pump depends on the design parameters of impeller, such as number of blades, blade angle, and rotating speed, etc. In this study, the effect of geometrical configurations of impeller on the degree of vacuum of self-priming pump was numerically investigated using ANSYS CFX with the shear stress transport (SST) turbulent model. Each of the design parameters was divided into 5 levels. The results of total loss coefficient, H-Q curve, pressure distribution were graphically depicted.
인듀서 입구각 변화가 자흡식 진공펌프 성능에 미치는 영향
김재원(Jae-Won Kim),서현석(Hyeon-Seok Seo),지효근(Hyo-Geun Ji),정윤근(Yoon-Keun Jung),김윤제(Youn-Jea Kim) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
Self-priming vacuum pump absorbs and transfers slurry by generating the internal vacuum pressure and the rotation of the impeller. Generating the internal vacuum pressure plays an important role in sucking the slurry at the inlet region of self-priming vacuum pump and it is mainly performed by the rotation of inducer. In this study, the hydraulic performance of self-priming vacuum pump was investigated with the changes of inducer inlet angle. Numerical analysis was also conducted under five different rotational speeds(2500, 2700, 2900, 3100 and 3300 RPM) by using commercial CFD code, ANSYS CFX. The results for mass flow rate, head and characteristic curve were prepared with various values of inducer angle.
지효근,정호제,김정현 경성대학교 공학기술연구소 2012 공학기술연구지 Vol.18 No.-
This paper presents the detection and diagnosis of air-conditioner electromagnetic sound through noise measurements. Electromagnetic sound originating from the motor is an unpleasant source of unwanted noise that should be detected at the manufacturing stage. A detection system using sound measurements was built and a detection algorithm based on FFT analysis is presented. Soun measurements are preferable over direct vibration measurement because it is non-contact and low cost. Experimental results show that our sound measurement system can detect electromagnetic sound effectively compared to using vibration measurements.