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In this study, to investigate in-cylinder tumble or swirl intake flow of a gasoline engine, the flow characteristics were examined with several swirl control valves (SCV) which intensify intake flow through steady flow experiment, and also turbulent characteristics of in-cylinder flow field was investigated using 2-frame cross-correlation particle image velocimetry (PIV) method. In the investigation of intake turbulent characteristics using PIV method, the different flow characteristics were showed according to SCV figures. The SCV installed engine had higher vorticity and turbulent kinetic energy than a baseline engine, especially around the wall and lower part of the cylinder. Above all, SCV B type was superior to the others. About energy dissipation and reynolds shear stress distribution, a baseline engine had larger loss than SCV installed one because flow impinged on the cylinder wall. It should be concluded, from what has been said above, as swirl component was added to existing tumble flow adequately, it was confirmed that turbulent intensity was enlarged, flow energy was conserved effectively through the experiment. In other words, there was a suggestion here that flow characteristics as these affected to in-cylinder combustion positively.

목차

Abstract

1. Inroduction

2. Cross-Correlation Particle Image Velocimetry Technique

3. Experimental Setup and Methodology

4. Results and Analysis

5. Conclusion

References

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UCI(KEPA) : I410-ECN-0101-2009-556-017792796