A study on fuel spray of spark-ignited direct injection engine using laser image technology

Lee, Nae Hyun; Park, Jong Ho; Choi, Kyu Hoon

doi:10.1007/bf02970487

Cited by 2 publications

(3 citation statements)

References 4 publications

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“…In addition, additives or intake air heating also can be addressed as solutions. Adding gasoline to improve the volatility or heating intake air, particularly, by EGR (Exhaust Gas Recirculation) can be recommended as the more easily applicable solutions in spite of some practical limitations (Lee et al, 1992). By applying these methods to promote evaporation, enhancement of spray dispersion under ambient conditions becomes possible, and of course, preventing 'wall wetting' due to liquid film formation.…”

Section: Introductionmentioning

confidence: 99%

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An investigation of methanol and methanol blended sprays using laser scattering images

Choi

2001

KSME International Journal

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The characteristics of methanol and methanol blended (M85) sprays were investigated under atmospheric conditions at various temperatures, ranging from non-vaporizing to vaporizing ambient conditions (298 -353 K) . From laser scattering images, the macroscopic characteristics of the spray, such as the spray tip penetration and the spray angle, were determined. Entropy concept was introduced to represent homogeneity and PIV analysis was adopted to determine the fluid dynamic information at each location of the spray. The correlation between entropy and vorticity strength enabled us to find their relations. The effect of ambient composition, mainly of viscous effect as affected by CO2 levels, was investigated using PIV and entropy analysis. Spray width and entropy value were found to tend to decrease at increased CO 2 levels.

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Section: Introductionmentioning

confidence: 99%

“…However, there seems to be no easy way to descri be them (Lee et al, 1999). It is even difficult to tell how large the volume of interest or how long the time should be when defining the degree of mixing, or perhaps homogeneity.…”

Section: Introductionmentioning

confidence: 99%

An investigation of methanol and methanol blended sprays using laser scattering images

Choi

2001

KSME International Journal

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“…However, all of the fuel economy can be achieved, while controlling of emissions, such as hydrocarbon, nitric oxide. and even soot, is required (Zhao et al, 1997;Houston and Cathcart, 1998;Wirth et al, 1998;Lee et al, 1998). The spatial distribution of fuel vapor is also an important consideration for determining the location of spark plug.…”

Section: Introductionmentioning

confidence: 99%

Development behavior of vaporizing sprays from a high-pressure swirl injector using exciplex fluorescence method

Choi

Kim

Hwang

2000

KSME International Journal

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The effects of ambient conditions on vaporizing sprays from a high-pressure swirl injector were investigated by an exciplex fluorescence method. Dopants used were 2% fluorobenzene and 9% DEMA (diethyl-methyl-amine) in 89% solution of hexane by volume. In order to examine the behavior of liquid and vapor phases inside of vaporizing sprays, ambient temperatures and pressures similar to engine atmospheres were set. It was found that the ambient pressure had a significant effect on the axial growth of spray, while ambient temperature had a great influence on the radial growth. The spatial distribution of vapor phase at temperatures above 473K became wider than that of liquid phase after half of injection duration. From the analysis of the area ratio for each phase, the middle part (region II) in the divided region was the region which liquid and vapor phases intersect. For liquid phase, fluorescence-intensity ratio was greatly changed at Ims after the start of injection. However, the ratio of vapor phase was nearly uniform in each divided region throughout the injection.

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A study on fuel spray of spark-ignited direct injection engine using laser image technology

Cited by 2 publications

References 4 publications

An investigation of methanol and methanol blended sprays using laser scattering images

An investigation of methanol and methanol blended sprays using laser scattering images

Development behavior of vaporizing sprays from a high-pressure swirl injector using exciplex fluorescence method

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