Characterization of Mixture Formation Processes in D.I. Gasoline Sprays by the Laser Absorption Scattering (LAS) Technique - Effect of Injection Conditions

Li, Tie; Yamakawa, Masahisa; Takaki, Daisuke; Nishida, Keiya; Zhang, Yuyin; Hiroyasu, Hiroyuki

doi:10.4271/2003-01-1811

Cited by 4 publications

(2 citation statements)

References 21 publications

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“…A CCD camera (TSI PIVCAM 10-30) and a straddling method 8 of the two pulsed lasers over the two frames of CCD camera were used to capture a pair of images. [30][31]. The LAS technique is based on the measurement of the relative 23 extinction of the two wavelength (ultraviolet and visible) lights by an evaporating spray.…”

Section: Lif-piv Measurements 20mentioning

confidence: 99%

Droplet size distribution and evaporation characteristics of fuel spray by a swirl type atomizer

Nishida

Hiroyasu³

2011

Fuel

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8Spray atomization and evaporation play extremely important roles in mixture formation and combustion 9 processes of direct injection (DI) gasoline engines. In this study, the fundamental characteristics of a swirl spray 10 injected into a constant volume vessel are investigated by means of several laser diagnostic techniques including the 11 laser diffraction-based method for droplet size distribution, the laser induced fluorescence-particle image velocime-12 try for velocity distributions of droplets and spray-induced ambient air flow, and the two-wavelength laser absorp-

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Section: Lif-piv Measurements 20mentioning

confidence: 99%

Droplet size distribution and evaporation characteristics of fuel spray by a swirl type atomizer

Nishida

Hiroyasu³

2011

Fuel

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“…Differences in the physical properties such as molecular mass and diffusion coefficient between the tracers and fuels could introduce measurement errors. In the LAS technique, the test fuel is required to strongly absorb the light with certain wavelength but its fuel vapor is almost transparent at the other wavelength [18]. In addition, the fuel sprays are assumed to be symmetric, which could degrade the measurement accuracy.…”

Section: Introductionmentioning

confidence: 99%

Quantitative measurements of fuel concentrations in direct-injection methanol-n-hexane sprays by laser induced breakdown spectroscopy

Zhang

Wang

Wei

2021

ICLASS

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Methanol is considered to be one of promising alternative fuels, and direct-injection (DI) of methanol-gasoline blends is attracting more and more interest due to the thermal efficiency advantages. However, quantitative measurements of component concentrations in DI methanol-gasoline blend sprays are still difficult. In this study, a novel approach based on the laser induced breakdown spectroscopy (LIBS) is developed to quantitatively and simultaneously measure the gas concentrations of n-hexane and methanol in methanolgasoline blend sprays in a constant volume vessel. Firstly, the calibrations between peak intensity ratios (PIR) of H656/N745 and atomic number ratios (ANR) of H/N, and PIR of O777/N746 and ANR of O/N are established respectively for three kinds of fuels (M0, M50, M100). The results show a good consistency of calibration curves for different fuels and different ambient pressures, suggesting the potentials of LIBS to measure multi-component fuels even at varied-pressure conditions. Then, the high-speed shadowgraph and diffused back-illumination method are employed to simultaneously image the entire spray and the liquid phase, and therefore determine the LIBS measuring positions. Finally, the fuel concentration measurements in M0 and M15 sprays are conducted and the radial distribution and the effects of ambient pressure are investigated. It is found that the blending fraction in M15 spray is increased with the radial distance increasing due to the lower boiling temperature and higher vapor diffusivity of methanol. The equivalence ratios in both M0 and M15 sprays are reduced with the increased ambient pressure, which can be attributed to the larger air density while nearly constant entrainment speed at higher ambient pressure. These results are believed to be valuable for development of numerical models and design of DI combustion systems.

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An Experimental Study on Mixture Formation Process of Flat Wall Impinging Spray Injected by Micro-Hole Nozzle under Ultra-High Injection Pressures

Nishida

Gao

2008

SAE Technical Paper Series

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Characterization of Mixture Formation Processes in D.I. Gasoline Sprays by the Laser Absorption Scattering (LAS) Technique - Effect of Injection Conditions

Cited by 4 publications

References 21 publications

Droplet size distribution and evaporation characteristics of fuel spray by a swirl type atomizer

Droplet size distribution and evaporation characteristics of fuel spray by a swirl type atomizer

Quantitative measurements of fuel concentrations in direct-injection methanol-n-hexane sprays by laser induced breakdown spectroscopy

An Experimental Study on Mixture Formation Process of Flat Wall Impinging Spray Injected by Micro-Hole Nozzle under Ultra-High Injection Pressures

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