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박호준(H. J. Park),장영준(Y. J. Chang) 한국자동차공학회 1990 오토저널 Vol.12 No.5
To study diesel fuel spray behavior, an experimental study was undertaken to investigate injection characteristics in varying back pressure and atomization mechanism in a non-evaporating diesel spray.<br/> Generally, injection characteristics is the curve of fuel flow plotted against time. The area under this curve is equal to the total quantity of fuel discharged for one injection. The method that measures rate of injection is long tube-type fuel rate indicator.<br/> Diesel spray injected into a quiescent gaseous environment under high pressure is observed by taking high speed camera by the focused shadow photographs. The results show that, at the start of injection, as the injected fuel rushes into the quiescent atmosphere the spray angle becomes large. Finally the spray stabilizes at a constant cone angle. Spray penetration length increases with the injection pressure.
김종우(J. W. Kim),김현규(H. k. kim),박호준(H. J. Park),전충환(C. H. Joen),장영준(Y. J. Chang) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_2
To diagnosis the complexible diesel fuel combustion processes and spray characteristics, many simplified injection systems are developed and used. Especially it is very popular that the solenoid servo valve use to control the fuel providing from injection pump to injector, but this system cause some problems, one of them is that makes a unsteady motion of needle when operating time is not enough. In this study, to clarify the effect of this unsteady motion of needle was measured by the injection rate and spray characteristics with using needle lift sensor.<br/>