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가솔린 직접분사식 고압선회 분사기의 분무 영역별 분무 특성 고찰
송범근,김원태,강신재,Song, Bhum-Keun,Kim, Won-Tae,Kang, Shin-Jae 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.1
According as the industry was developed, the pollution of the environment and atmosphere rose up to the surface. So, the focus is now concentrated on the engines of affinity for nature. And the investigators make more effort to the improvement in the performance of engines, depending to the prices of oil and the anxiety about the exhaustion of the fossil fuel go up. So the GDI engines head up for these necessities. In this experimental study, the spray flow characteristics for a commercial injector equipped in the present GDI engine were investigated, which had a strong influence on the engine performance and emissions. The experiment was performed at the injection pressures of 1, 3, 5 and 7MPa under the atmospheric condition. A PDPA system was used to specify the flow characteristics of the spray. Also, the global spray behavior classified into three regions as leading, main spray and vortex cloud region, was analyzed by using a visualization system. And the regions were compared with each other.
가솔린 직접분사식 고압 슬릿 노즐의 팬형 분무 특성 고찰
송범근(Bhum Keun Song),김종민(Chong Min Kim),강신재(Shin Jae Kang) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
A new stratified charge combustion system has been introduced and developed for GDI engines. Before this new GDI system, the stratified mixture was formed by a high pressure swirl injector. But, the special feature of new system is employed of a thin fan-shaped fuel spray formed by a slit type nozzle. Also, this system has been adopted a shell-shaped spray characteristics such as spray tip penetration, spray angle, SMD and velocities of droplets using PDPA(Phase Doppler Particle Analyzer) system and spray visualization system to obtain the concept of the new disign and the fundamental data for the next generation GDI system. The experiment was performed at the injection pressures of 5 and 9MPa under the atmospheric condition.