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스펙트럴 차분법에 의한 회전 진동하는 타원형 실린더 주위의 유동해석
임기창(Ki-chang Im),배명환(Myung-whan Bae),윤경미(Gyung-mi Yun),김형만(Hyung-man Kim) 한국자동차공학회 2001 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
Methods applied to numerical analyses in field of thermo-fluid dynamics were mainly divided into finite difference, finite clement and spectral schemes. In this paper. the spectral finite difference method that is one of spectral schemes was used. This scheme was based on a Fourier series as one of spectral functions. The key point of this scheme is that it introduces no approximation in leading the resulting system of equations in principle, but just introduces discretization to tile resulting system of equations by a finite difference approximation only for getting numerical solutions. Analytic object in this paper is chosen to be an elliptic cylinder performing a rotary oscillation. It is assumed to be incompressible. laminar, two-dimensional and Newtonian fluid. In coordinate system. a non-inertial coordinate system increasing the free degree of analytic object is adopted. It is found that the numerical calculation of drag coefficient in circular cylinder is in a good agreement with experimental data.<br/>
대형 2행정 디젤기관에 있어서 실린더 주유기용 전자제어 퀼 축압분배기 개발
정화(Hwa Jung),배명환(Myung-whan Bae),김인덕(In-deok Kim),임기창(Ki-chang Im),한영욱(Young-wook Han),Syaiful,Byan Wahyu Riyandwita 한국자동차공학회 2007 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
Minimizing the cylinder wear and the consumption rate of cylinder oil in a large two-stroke diesel engine is of great economic importance. A motor-driven cylinder lubricator for Sulzer RT-flex large two-stroke diesel engines developed by authors is in need of mounting a quill system to lubricate cylinder parts for smoother operation. In order to apply the common-rail lubricating system to the developed cylinder lubricator as the second research stage, the quill system with a progressively quantitative distributor is improved in the electronically controlled quill system with an accumulated distributor. In this study, the effects of lubricator motor speed, plunger stroke and cylinder back pressure on oil feed rate, maximum discharge and delivery pressures are experimentally investigated by using the electronically controlled quill system with an accumulated distributor in the developed cylinder lubricator. It is found that the oil feed rate of the electronically controlled quill system with an accumulated distributor is larger than that of the quill system with a progressively quantitative distributor because of the increase of delivery speed and volume by changing the location of accumulator in the same experimental condition.