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1,200 mm 급 축류펌프 임펠러 형상변화가 성능에 미치는 영향
김상원(Sang-Won Kim),김영기(Young-Gee Kim),김태윤(Tae-Yoon Kim),김윤제(Youn-Jea Kim) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
Variable-pitch axial-flow pump has an advantage of preventing the breakdown by pitching impeller angle, leading to the performance improvement. In order to make an effective use of the axial-flow pump under its various operating conditions such as flow rate and rotating velocity, it is of significant importance to find the best performance point for different impeller angles in Q-H curve. In this study, the effect of impeller angles on the performance of 1,200 mm axial-flow pump under varied flow rates was numerically investigated using the commercial CFD code, ANSYS CFX ver. 17.1. The numerical results of the present study and existing experimental data for the efficiency and total head were compared to evaluate the reliability of the numerical method and they showed a good agreement.
드래프트 관이 장착된 교반기 내의 유동 및 혼합특성 연구
황정훈,김윤제,Hwang, Jung-Hoon,Kim, Youn-Jea 한국유체기계학회 2007 한국유체기계학회 논문집 Vol.10 No.1
Because the mixing efficiency is influenced remarkably by varying the geometrical configurations, the study of flow characteristics inside the mechanical agitator is very important to improve the performances. The draught tube in the agitator makes intermixing between the screw and tube by interrupting radial flow, and it makes circulation region in a mixing chamber. In general, the helical screw agitator with a draught tube (HSA) is proved more efficient to mix than the others. Consequently, such as the shapes of helical screw, number of pitches and the variation of angular velocity are the main parameters for improving the capacity of HSA. And also the suspension of the solid particles in the agitator can be determined these parameters. The rate of solids suspension in the mixing chamber was quantified with a statistical average value, of. Numerical analyses were carried out, using a commercial CFD code, Fluent, to obtain the velocity, pressure and particle distributions under steady, laminar flow and no-slip conditions. Results are graphically depicted with various parameters.
공기압축기 성능향상을 위한 로터 프로파일 설계기술 개발 연구
김태윤(Kim Tae-Yoon),이재영(Lee Jae-Young),이동균(Lee Dong-Kyun),김윤제(Kim Youn-Jea) 한국철도학회 2009 한국철도학회 세미나자료 Vol.2009 No.5
The performance of screw compressor depends on lots of design parameters of rotor profile, such as length of seal line, wrap angle, blow hole, suction and discharge port size, number of rotor lobe, etc. The optimum rotor profile makes it possible to increase the compression efficiency with low energy consumption, and to minimize the loss of power. In this research, a new rotor profile design and performance analysis are done by computer simulation. It is expected that the volumetric efficiency is improved because the internal leakage is reduced due to the minimization of blow hole and clearance, and the stiffness of rotors is increased due to the reduction of length to diameter ratio. Also, the specific power consumption will be secured for use ranging from low to high operation speed.
Numerical study of the energy separation in the novel-designed vortex tube
Shi Yang,김윤제(Youn-Jea Kim) 한국유체기계학회 2009 유체기계 연구개발 발표회 논문집 Vol.2009 No.-
In present work we use numerical method to investigate a novel-designed vortex tube. The aims of this research can be summarized in two points as follows. One is to determine the relationship between the inlet air pressure and the effect of the new vortex tube. The other is to obtain the optimal angle of the taper which is the part of the new vortex tube. In this study, numerical analyses are performed, using a commercial CFD code, FLUENT. Temperature, velocity and pressure fields are obtained by simulating the novel-designed vortex tube. By comparing the simulation results using different models, we find the connection between the entrance pressure and the effect in the new vortex tube. Also we get an optimal angle for the taper in the novel-designed vortex tube.
제동시간이 통풍형 디스크 브레이크 시스템의 건전성에 미치는 영향
곽우경,홍창기,김윤제,Gwak, Woo-Gyeong,Hong, Chang-Ki,Kim, Youn-Jea 한국자동차안전학회 2016 자동차안전학회지 Vol.8 No.1
In order to analyze the soundness of ventilated disc brake systems, numerical study was performed with various vane shapes. In particular, two different vane type, and the braking time from 3.0 s to 4.5s with the interval of 0.5s were considered. Transient temperature distributions on the ventilated disc brake assembly were calculated using ANSYS CFX ver. 16.1. To elucidate the soundness of ventilated disc brake systems, moreover, the heat transfer coefficients were evaluated. Results were graphically depicted with different geometrical vane configurations and braking time.