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首页> 外文期刊>Applied optics >Imaging of droplets and vapor distributions in a Diesel fuel spray by means of a laser absorption-scattering technique
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Imaging of droplets and vapor distributions in a Diesel fuel spray by means of a laser absorption-scattering technique

机译：利用激光吸收散射技术对柴油机燃料喷雾中的液滴和蒸汽分布进行成像

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The droplets and vapor distributions in a fuel spray were imaged by a dual-wavelength laser absorption-scattering technique. 1,3-dimethylnaphthalene, which has physical properties similar to those of Diesel fuel, strongly absorbs the ultraviolet light near the fourth harmonic (266 nm) of a Nd:YAG laser but is nearly transparent to the visible light near the second harmonic (532 nm) of a Nd:YAG laser. Therefore, droplets and vapor distributions in a Diesel spray can be visualized by an imaging system that uses a Nd:YAG laser as the incident light and 1,3-dimethylnaphthalene as the test fuel. For a quantitative application consideration, the absorption coefficients of dimethylnapthalene vapor at different temperatures and pressures were examined with an optical spectrometer. The findings of this study suggest that this imaging technique has great promise for simultaneously obtaining quantitative information of droplet density and vapor concentration in Diesel fuel spray.
机译：通过双波长激光吸收散射技术对燃油喷雾中的液滴和蒸汽分布进行成像。 1,3-二甲基萘的物理性质与柴油燃料相似，可强烈吸收Nd：YAG激光器四次谐波（266 nm）附近的紫外光，但对第二次谐波附近的可见光几乎透明（532） Nd：YAG激光。因此，可以通过使用Nd：YAG激光作为入射光和1,3-二甲基萘作为测试燃料的成像系统来可视化柴油机喷雾中的液滴和蒸汽分布。为了进行定量应用，使用光谱仪检查了在不同温度和压力下二甲基萘蒸气的吸收系数。这项研究的发现表明，这种成像技术有望同时获得柴油机燃料喷雾中液滴密度和蒸气浓度的定量信息。

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