(1-22) Characterization of Droplets and Vapor Concentration Distributions in Split-Injection Diesel Sprays by Processing UV and Visible Images((FS-2)Fuel Sprays 2-Diesel sprays)
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概要
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Some recent experimental studies have shown that with split injection strategy, the soot and NOx emissions from a diesel engine can be reduced significantly in comparison with the conventional non-split injection strategy. To understand the mechanism of emissions reduction, it is essential to clarify the process of the fuel mixture formation. In order to characterize the droplets and vapor concentration distribution inside the fuel sprays, a dual-wavelength laser absorption-scattering technique was developed by using the second harmonic (532nm) and the fourth harmonic (266nm) of a Nd : YAG laser and using dimethylnaphthalene as the test fuel. It was clarified that dimethylnaphthalene, which has physical properties similar to diesel fuel, is transparent in visible light near 532nm and is a strong absorber of ultraviolet light near 266nm. Based on this result, the vapor concentration in a fuel spray can be determined by the two separate measurements : a transmission measurement at a non-absorbing wavelength to detect the droplets optical thickness and a transmission measurement at an absorbing wavelength to detect the joint vapor and droplets optical thickness. The droplets density can be determined by extinction imaging through the transmission at the non-absorbing wavelength. By applying the ultraviolet-visible laser imaging technique, the distributions of droplets and vapor concentration in the spray, which was injected into a high-temperature and high-pressure nitrogen gas in a constant volume vessel, were measured and quantitatively analyzed. The effect of injection mass ratio of double-pulse injection on distributions of equivalence ratios of vapor and droplets was clarified. In the following figure, the contours of equivalence ratios of vapor and droplets in the diesel sprays with different injection ratios are shown. It has been found that the injection mass ratio has significant effect on the fuel distributions in the diesel spray ; the subsequent injection of a double-pulse injection scheme has a turbulent effect on the fuel-air mixing in the diesel spray injected in the preceding pulse.
- 一般社団法人日本機械学会の論文
- 2001-07-01
著者
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Zhang Yuyin
Dept. Of Mechanical System Engineering University Of Hiroshima
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Zhang Yuyin
Department Of Mechanical System Engineering Hiroshima University
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Nishida Keiya
Department Of Mechanical Engineering Hiroshima University
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YOSHIZAKI Takuo
Nippon Institute of Technology, Science University of Tokyo
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Yoshizaki Takuo
Nippon Institute Of Technology Science University Of Tokyo
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Nishida Keiya
Dept. of Mechanical System Engineering, University of Hiroshima
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- Characterization of Droplets and Vapor Concentration Distributions in Split-Injection Diesel Sprays by Processing UV and Visible Images(Recent Combustion Technology in Internal Combustion Engines)
- (1-22) Characterization of Droplets and Vapor Concentration Distributions in Split-Injection Diesel Sprays by Processing UV and Visible Images((FS-2)Fuel Sprays 2-Diesel sprays)
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