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논문 기본 정보

자료유형
학술저널
저자정보
저널정보
한국자동차공학회 International journal of automotive technology International journal of automotive technology Vol.5 No.4
발행연도
2004.12
수록면
221 - 238 (18page)

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Wall interactions of direct injection spray were investigated using laser-sheet imaging, shadowgraphy, wetted footprint and phase Doppler interferometry techniques. A narrow-cone high-pressure swirl injector is used to inject iso-octane fuel onto a plate, which has three different impact angles inside a pressurized chamber. Heated air and plate conditions were compared with unheated cases. Injection interval was also varied in the heated case to compare dry- and wet- wall impingement behaviors. High-speed macroscopic Mie-scattering images showed that presence of wall and air temperature has only minor effect on the bulk spray structure and penetration speed for the narrow-cone injector tested. The overall bulk motions of the spray plume and its spatial position at a given time are basically unaffected until a few millimeters before impacting the wall. The surface properties of the impact surface, such as the temperature, the presence of a preexisting liquid film also have a small effect on the amount of wetting or the wetted footprint; however, they have strong influence on what occurs just after impact or after a film is formed. The shadowgraph in particular shows that the plate temperature has a significant effect on vapor phase propagation. Generally, 10-20% faster horizontal vapor phase propagation is observed along the wall at elevated temperature condition. For impingement onto a preexisting film, more splash and evaporation were also observed. Contrary to some preconceptions, there is no significant splashing and droplet rebounding from surfaces that are interposed in the path of the DI gasoline spray, especially for the oblique impact angle cases. There also appears to be a dense spray front consists of large sac spray droplets in the oblique impact angle cases. The bulk of the spray is not impacted on the surface, but rather is deflected by it The microscopic details as depicted by phase Doppler measurements show that the outcome of the droplet impaction events can be significantly influenced. Only droplets at the spray front have high enough Weber numbers for wall impact to wet, splash or rebound. Using the sign of vertical velocity, the time-resolved downward droplets and upward droplets are compared. The Weber number of upward moving droplets, which seldom exceeds unity, also decreases as the impact angle decreases, as the droplets tend to impact less and move along the wall in the deflected spray plume.

목차

ABSTRACT

NOMENCLATURE

1. INTRODUCTION

2. EXPERIMENTAL SETUP

3. RESULT AND DISCUSSIONS

4. PDI MEASUREMENT

5. CONCLUSION

ACKNOWLEDGEMENT

REFERENCES

참고문헌 (20)

참고문헌 신청
[학술지(정기간행물)] - / 1995 / Development of methodology for spray impingement simulation (950283) google schola [학술지(정기간행물)] - / 1996 / Mathematical modeling of wall films formed by impinging sprays. (960626) google schola [학술지(정기간행물)] - / 1999 / Influence of the Wall temperature on the mixture preparation in di gasoline engines 54 (2) : 211 ~ 222 google schola [학술지(정기간행물)] - / 2000 / Spray/Wall interaction models for multidimensional engine simulation 1 (1) : 127 ~ 146 google schola [학술지(정기간행물)] - / 1999 / Further experiments on the effects of in-cylinder wall wetting on HC emissions from direct-injection gasoline Engines (1999-01-3661) : 1999 ~ google schola

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