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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.
노즐 형상변화에 따른 HVOF 용사총에서의 유동특성에 관한 수치적 연구
백재상(Jae-Sang Baik),김윤제(Youn-Jea Kim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
HVOF thermal spray guns are now being widely used to produce protective coatings, on the surfaces of engineering components. HVOF technology employs a combustion process to heat the gas flow and melt the coating materials which are particles of metals, alloys or cermets. Particle flow which is accelerated to high velocities and combustion gas stream are deposited on a substrate. In order to obtain good quality coatings, the analysis of torch design must be performed. The reason is that the design parameters of torch influence gas dynamic behaviors. In this study, numerical analysis is performed to predict the gas dynamic behaviors in a HVOF thermal spray gun with various torch shapes. The CFD model is used to deduce the effect of changes in nozzle geometry on gas dynamics. Using a commercial code, FLUENT which uses Finite Volume Method and SIMPLE algorithm, governing equations have been solved for the pressure, velocity and temperature distributions in the HVOF thermal spray torch.