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The Effects of Tumble and Swirl Flow on the Behavior of Liquid/Vapor Phases in a DI Gasoline Engine  

강정중 (부산대학교 대학원)
최동석 (부산대학교 기계기술연구소)
김덕줄 (부산대학교 기계기술연구소)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.10, no.2, 2002 , pp. 23-30 More about this Journal
Abstract
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 $(BTDC\;270^{\circ},\;180^{\circ})$, 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 $(BTDC\;90^{\circ})$, tumble flow transported vapor phase to the intake valve and swirl flow to the exhaust valve.
Keywords
Optically accessible engine; Exciplex fluorescence method; Injection timing; Tumble flow; Swirl flow;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
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