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[論文] 稀釋터널을 使用한 디젤엔진 微粒子狀 排出物 測定에 關한 硏究
채재우(J.O.Chae),김희수(H.S.Kim),오신규(S.K.Oh) 한국자동차공학회 1987 오토저널 Vol.9 No.1
<br/> A Mini-Dilution Tunnel is described as a scaled down comparision of a Standard Tunnel. This paper presents tbe result of experimental investigations on measuring the particulate emission of a diesel engine in a Mini and a Standard Dilution Tunnel.<br/> The result offers a contribution to understanding about the influence of several parameters including dilution ratios, mixture temperatures, mixture conditions, filter temperatures, and flow conditions.<br/> In the experiment eitber increasing the filter temperature and mixture temperature at a fixed dilution ratio or increasing the dilution ratio at a fixed filter temperature and mixture temperature resulted in a decrease in the total particulate mass.<br/> These changes in total particulate mass were attributed to the changes in the soluble organic fraction of the particulate sample.<br/> Also, mass differences between the Mini and the Standard Dilution Tunnel for the same engine conditions were within approximately 15% of each other.
[論文] 연료분사노즐의 니들밸브 형상변화에 따른 분무특성에 관한 연구
채재우(J.O.Chae),임무룡(M.Y.Leem),오신규(S.K.Oh) 한국자동차공학회 1987 오토저널 Vol.9 No.4
The experimental study, using constant pressure injection system, is carried out to investigate the effect of the geometrical shape changes of the needle valve on the effective flow area, the spray angle and the Sauter's Mean Diameter according to needle valve lift for a pintle-type injection nozzle.<br/> The results are as follows:<br/> 1) With the increase of the needle valve lift, the effective flow area is increased, the spray angle is at first increased and later decreased, and the sauter's Mean Diameter is decreased.<br/> 2) It is also shown that the spray angle is maximum at the rapidly increased region of the effective flow area.