분사기 온도의 변화가 직접분사식 가솔린 엔진의 분무 형상에 미치는 영향

Abstract

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. Interaction between flow-field and injected spray was investigated in a steady flow rig by using slit injector and swirl injector. To visualize and analyze the spray behaviors in various injector temperatures Mie scattering and shadowgraph methods were used. To measure the fuel droplet size and distribution phase Doppler anemometry (PDA) method was also used.