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초록· 키워드

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Tumble or swirl flow is used adequately to promote mixing of air and fuel in the cylinder and to enlarge turbulent intensity in the late time of compression stroke. However, since in-cylinder flow is a kind of transient state with rapid flow variation, that is, non-steady state flow, swirl or tumble flow has not been analyzed sufficiently and not been recognized whether they are available for combustion theoretically yet. In the investigation of intake turbulent characteristics using PIV method, different flow characteristics were showed according to SCV figures. SCV installed engine had higher vorticity, turbulent strength by fluctuation and turbulent kinetic energy than a baseline engine, especially around the wall and lower part of the cylinder. Above all, SCV B was superior to the others. About energy dissipation, a baseline engine had larger loss than SCV installed one because flow impinged on the cylinder wall. Consequently, as swirl flow was added to existing tumble flow, it was found that fluctuation component increased and flow energy was conserved effectively through the experiment.

목차

1. 서론

2. 상호상관(Cross-correlation)PIV 계측기법

3. 실험장치 및 방법

4. 실험결과 및 고찰

5. 결론

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UCI(KEPA) : I410-ECN-0101-2009-556-014000531