| 제목 |
직분식 엔진에서 실린더 내 연료의 액·기상 거동에 미치는 텀블과 스월의 영향 |
| 분야 |
엔진 및 연소 |
| 언어 |
Korean |
| 저자 |
강정중(부산대학교), 최동석(부산대학교), 김덕줄(부산대학교) |
| Key Words |
Optically accessible engine(가시화엔진), Exciplex fluorescence method(Exciplex 형광법), Injection timing(분사시기), Tumble flow(텀블유동), Swirl flow(선회유동) |
| 초록 |
This present study experimentally investigates the behavior of liquid and vapor phase of fuel mixtures with changing the in-cylinder air motion in an optically accessible engine. The conventional MPI/DOHC engine was modified to gasoline direct injection engine with swirl motion. The images of liquid and vapor phases were captured in the motoring operation condition using exciplex fluorescence method. Two dimensional spray fluorescence images of liquid and vapor phases were acquired to analyze spray behaviors and fuel distribution inside of cylinder respectively. In early injection timings (BTDC 270˚ 180˚), tumble flow transported most of vapor phase to the lower region and the both sides of cylinder, so vapor phase didn't become uniform distribution up to the half of the compression stroke. In the case of swirl flow, the fuel mixture was confined near the swirl origin in upper region of cylinder. In late injection timings (BTDC 90˚), tumble flow transported vapor phase to the intake valve and swirl flow to the exhaust valve. |
| 원문(PDF) |
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