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학술저널
저자정보
저널정보
한국자동차공학회 International journal of automotive technology International journal of automotive technology Vol.8 No.2
발행연도
2007.4
수록면
127 - 135 (9page)

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The objective of this study is to analyze the effect of velocity and vorticity on stratified mixture formation in the visualization engine. In order to investigate spray behavior, the spray velocity is obtained through the crosscorrelation PIV method, a useful optical diagnostics technology and the vorticity calculated from the spray velocity component. These results elucidated the relationship between vorticity and entropy, which play an important role in the diffusion process for the early injection case and the stratification process for the late injection case. In addition, we quantified the homogeneous diffusion rate of spray using entropy analysis based on Boltzmann’s statistical thermodynamics. Using these methods, we discovered that the homogeneous mixture distribution is more effective as a momentum dissipation of surrounding air than that of the spray concentration with a change in the injection timing. We found that the homogenous diffusion rate increased as the injection timing moved to the early intake stroke process, and BTDC 60° was the most efficient injection timing for the stratified mixture formation during the compression stroke.

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ABSTRACT
1. INTRODUCTION
2. EXPERIMENTAL SETUP AND METHODS
3. RESULTS AND DISCUSSIONS
4. CONCLUSIONS
ACKNOWLEDGEMENT
REFERENCES

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