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[論文] 보올형상과 선회비에 따른 디젤기관 실린더내의 유동장 해석
최영진(Y. J. Choi),양희천(H. C. Yang),유홍선(H. S. Ryou),최영기(Y. K. Choi) 한국자동차공학회 1991 오토저널 Vol.13 No.2
There are many factors which influence on the performance of a diesel engine. The piston bowl shape and swirl ratio are important factors to enhance the fuel-air mixing and flame propagation.<br/> In this study, calculations of the flow field in the cylinder of the diesel engine were carried out using the CONCHAS-SPRAY code for different bowl shapes and swirl ratios.<br/> In the case of constant swirl ratio, vortices which affect fuel-air mixing, evaporation and flame propagation are generated more strongly and consistently in the bowl-piston type combustion chamber than in the flat piston type. With this strong squish effect, injected fuel droplets are widely diffused and rapidly evaporated in the bowl-piston type combustion chamber. Especially a strong squish is developed and large and strong vortices are generated in the edge cutted bowl piston chamber.<br/> As the swirl ratio increases, it is found that a large and strong squish and vortices are generated in the combustion chamber and also fuel droplets are diffused into the entire combustion chamber.
최영진(Y. J. Choi),장세종(S. J. Jang),김상욱(S. W. Kim),전병서(B. S. Jeon),김상무(S. M. Kim),송창빈(C. B. Song),김용찬(Y. C. Kim),남궁정(J. Namkung) 한국자기학회 2015 韓國磁氣學會誌 Vol.25 No.1
This study was carried out to investigate a influence of humidity variation (%) on the magnetic properties and the surface flaws in the fabrication of Fe-based Fe78Si9B13 amorphous alloy ribbon by Planar Flow Casting process. As a result, the size of the air pocket and the droplet which is observed in the contact surface and the free face of the amorphous alloy ribbon becomes large when the humidity increases and the size highly increases with the surface roughness at the same time. Especially, the surface roughness value which is made in the 65 % of the humidity is the lowest in the contact surface (Ra = 0.60 μm, Rz = 3.11 μm) and the free face (Ra = 0.47 μm, Rz = 3.00 μm). Also, in case of the soft magnetic property of the magnetic core which is made with the toroidal core of 23(OD)*20(ID)*20(H) size, in the sample of the amorphous alloy ribbon which is made in 65% of the humidity, the most excellent value is gained as Bs(B<SUB>700</SUB>) = 1.055 T, H<SUB>c</SUB> = 0.083 Oe, permeability = 1,197 and core loss = 0.276W/kg.