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[論文] 平行空氣流에 의한 液膜流 表面波의 分裂機構에 關한 實驗的硏究
이규영(G. Y. Lee),양옥룡(O. Y. Yang) 한국자동차공학회 1992 오토저널 Vol.14 No.6
This paper deals with an experimental study on the initial condition of liquid film surface waves disintegration and investigation on the behavior of liquid film surface waves formed by the high speed air flow on the solid plane surface.<br/> The authors conducted the qualitative and quantitative study to in vestigate the liquid film flow phenomena. the liquid film disintegration mechanism, and droplet formation process with breaking the liquid film surface wave. The newly devised transparent rectangular test section which has semitwo-dimensional flow at the center of the bottom was introduced to perform the experimental study, and it can generate the uniform thickness liquid film at the bottom. The strobo streak camera was used to obtain the instantaneously transformed photographs.<br/> The electronic measuring device was also used to measure the liquid film thickness variation in order to perform the easy and effective analysis of complex flow phenomena in the air-water cocurrent flow.
허종철(J. C. Huh),구자왕(J. W. Ku),이규영(G. Y. Lee),양옥룡(O. Y. Yang) 한국자동차공학회 1991 오토저널 Vol.13 No.2
This study is to investigate the dispersion characteristics of diesel fuel spray in the initial stage of the beginning of the injection under the condition of room temperature and atmospheric pressure.<br/> It is difficult to analyse that the diesel fuel spray in diesel engine has unsteady intermittent spray. So auther installed a fuel accumulator and an electromagnetic controller in order to keep the constant fuel injection rate with the time variation. With this modified fuel injection system, spray tip penetration, spray angle and initial spray development process are investigated by instantaneous photographic method.<br/> The results obtained in this study are as follows:<br/> 1) The initial shape of injection of diesel fuel spray shows the form of non-disintegrated intact core, but the formation of ligaments increasingly grows as the time increases. It can also be<br/> shown that fine droplets become disintegrated out from the ligaments.<br/> 2) The slope of spray tip penetration was changed to two different tendencies with time. The transition point of the slope is shown at the time of around between 0.09 msec and 0.4 msec from the beginning of injection. This is transition time from non-disintegrated intact core to formation of ligaments.