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분사기 온도의 변화가 직접분사식 가솔린 엔진의 분무 형상에 미치는 영향
문석수(Seoksu Moon),최재준(Jaejoon Choi),배충식(Choongsik Bae) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The spray characteristic of direct-injection spark-ignition (DISI) engines is a crucial factor for obtaining optimal engine combustion. The spray characteristic of DISI engines is affected by many factors such as ambient pressure, ambient temperature, injection pressure, flow velocity, fuel temperature, and so on. In this study, the effects of injector temperatures, representing various fuel temperatures, were particularly investigated. <br/> Interaction between flow-field and injected spray was in a steady flow rig by using slit injector and shadowgraph methods were used. To measure the fuel droplet size and distribution phase Doppler anemometry(PDA) method was also used.
문석수(Seoksu Moon),배충식(Choongsik Bae),최재준(Jaejoon Choi) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The spray characteristics of swirl spray at different taper angles are investigated and then a taper angle, generating an opened hollow cone spray, is chosen to create the robust swirl spray at various surrounding conditions. The tapered nozzle altered the symmetrical distribution of fuel and velocity to asymmetrical state. The larger portion of fuel was positioned in some area with higher injection velocity, and the smaller portion of fuel was located in another area with lower injection velocity. When the taper angle was decreased, the fuel velocity to a certain direction was getting increased and spray images showed more asymmetrical shape. By cutting the nozzle to have a tapered nozzle with an angle less than the flow angle, opened hollow cone spray was formed because some part of fuel impinges to the cut area. This shape assists in equalizing the pressure difference between the centerline and outer part of spray envelop. The results showed that there is a potential from a tapered nozzle spray to be independent of the various surrounding conditions without much sacrifice of the atomization quality when the taper angle is less than the flow angle.