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직분식 가솔린 엔진용 선회 분사기의 연료 온도에 따른 노즐 내부 및 주변의 액막 유동 변화
문석수(Seoksu Moon),최재준(Jaejoon Choi),E.F Abo-Serie(E.F Abo-Serie),배충식(Choongsik Bae) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_1
The fuel temperature before injection can be affected by cylinder head and in-cylinder gas temperatures. This change in fuel temperature causes a significant change in spray characteristics from swirl injector. This investigation is aimed at identifying the variation in flow conditions inside and near the nozzle of a swirl injector as a result of increasing fuel temperature. The liquid film inside a transparent nozzle attached to the main nozzle of the injector was visualized and its thickness variation at different fuel temperatures was analyzed. The liquid film profile and nozzle spray angle were also investigated very close to the nozzle exit. Gasoline and isooctane which have different boiling points were used to identify the effects of evaporation. Results showed that significant variations in liquid film and flow profile exist as the fuel temperature increases when using gasoline compared to isooctane.
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.