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소형 터보압축기의 디퓨저 형상변화에 따른 유동특성 고찰
김홍식,김윤제,김철수,Kim, H.-S.,Kim, Youn J.,Kim, C.-S. 한국유체기계학회 2001 한국유체기계학회 논문집 Vol.4 No.3
The effects of diffuser shapes on the flowfields of a small-size turbo-compressor have been investigated numerically and experimentally. The optimal design of elements shapes is important to develop the high efficiency turbo-compressor. Typical range of rotating speed for a small-size turbo-compressor is 40,000-70,000rpm. Numerical analyses were conducted to the rectangular and conical shapes of diffuser Three-dimensional, steady and viscous governing equations were solved by SIMPLE algorithm. To confirm the numerical results, the experimental measurements for the static pressure and temperature at the inlet and outlet boundaries were performed. Comparisons of these results were done, and the reasonable agreements were acquired.
소형 터보압축기의 디퓨져 형상변화에 따른 유동특성 고찰
김홍식(H.-S. Kim),차관(K. Cha),김윤제(Youn J. Kim) 한국유체기계학회 2000 유체기계 연구개발 발표회 논문집 Vol.- No.-
The effects of diffuser shapes on the flowfields of a small-size turbo-compressor have been investigated by numerically and experimentally. It is important to optimal design of each elements for developing the small-size turbo-compressor. Typical range of rotating speed of a small-size turbo-compressor is 40,000-70,000rpm. Numerical analyses are conducted to the rectangular and conical shapes of diffusers. Three-dimensional, steady, viscous governing equations are solved by SIMPLE algorithm. To prove the numerical results, experimental studies for the measurements of static pressure and temperature at the inlet and outlet boundaries are performed. Comparisons of these results are executed, and reasonable agreements are acquired.
김홍식(H.S.Kim),박재인(J.I.Park),주원구(W.K.Joo),조강래(K.R.Cho) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_1
The automotive torque converter consists of pump, turbine and stator. Its detailed design procedure is not yet known and remains know-how of the torque converter manufacturers. One-dimensional analysis is a strong solver in elementary design, but weak in presumption of performances and cannot validate 2 or 3-dimensional design parameters. In this paper, design process and parameters of 3-dimensional blade profile are discussed. And 3-dimensional turbulent flow analysis was performed for the designed torque converter. It was shown that the design of torque converter would be performed effectively by using the design method along with the flow analysis method described here.<br/>
화재 발생시 환기방식에 따른 지하공동구내 열유동 특성 연구
김홍식(H.-S. Kim),황인주(I.-J. Hwang),김윤제(Youn J. Kim) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
The underground utility tunnels are important facility as a mainstay of country because of communication<br/> developments. The communication and electrical duct banks as well as various utility lines for urban life are<br/> installed in the underground utility tunnel systems. If a fire breaks out in this life-line tunnel, the function of<br/> the city will be discontinued and the huge damages are occurred. In order to improve the safety of life-line<br/> tunnel systems and the fire detection, the behaviors of the fire-induced smoke flow and temperature<br/> distribution are investigated. In this study we assumed that the fire is occurred at the contact or connection<br/> points of cable. Numerical calculations are carried out using different velocity of ventilation in utility tunnel.<br/> The fire source is modeled as a volumetric heat source. Three-dimensional flow and thermal characteristics in<br/> the underground tunnel are solved by means of FVM (Finite Volume Method) using SIMPLE algorithm and<br/> standard κ-ε model for Reynolds stress terms. The numerical results of the fire-induced flow characteristics in<br/> an underground utility tunnel with different velocity of ventilation are graphically prepared and discussed.