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首页> 外文期刊>Combustion Science and Technology >INVESTIGATION ON TEMPERATURE OF EVAPORATING DROPLETS IN LINEAR STREAM USING TWO-COLOR LASER-INDUCED FLUORESCENCE
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INVESTIGATION ON TEMPERATURE OF EVAPORATING DROPLETS IN LINEAR STREAM USING TWO-COLOR LASER-INDUCED FLUORESCENCE

机译：用两色激光诱导荧光研究线性流中蒸发液滴的温度

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摘要

This article presents investigations on the temperature evolution of mono-disperse, low evaporating, and interacting ethanol droplets in a linear stream. The droplets are injected over the ambient temperature, and the influence of injection parameters such as velocity, temperature, interdroplet spacing, and droplet size on the droplet's cooling process is analyzed. It is shown that the typical droplet cooling process is characterized by two well-separated phases. In the first, the temperature decreases strongly, since the effect of forced convection is enhanced by the transport of air and the fuel vapor concentration in the boundary layer is far from saturation conditions. The second phase exhibits a reduction of the temperature rate of change, in connection with the decrease of the forced convection effects and enhancement of the fuel vapor concentration in the boundary layer. The effect of the injection velocity on the droplet cooling process is low, as a significant effect of the interdroplet spacing is observed. The respective influences of the injection temperature and droplet size on the heat transfer are jointly studied. It is shown that for a given injection temperature, the total energy extracted from the droplet per unit surface is insensitive to the droplet size. In this article, the mean droplet temperature is measured by two-color laser-induced fluorescence.
机译：本文介绍了线性流中单分散，低蒸发和相互作用的乙醇液滴温度演化的研究。在环境温度下注入液滴，并分析注入参数（例如速度，温度，液滴间距和液滴尺寸）对液滴冷却过程的影响。结果表明，典型的液滴冷却过程的特征在于两个良好分离的相。首先，由于空气的输送增强了对流的作用，并且边界层中的燃料蒸汽浓度远离饱和状态，因此温度急剧下降。与强制对流作用的减小和边界层中燃料蒸汽浓度的增加有关，第二阶段的温度变化率降低。喷射速度对液滴冷却过程的影响很小，因为观察到液滴间间距的显着影响。共同研究了注入温度和液滴尺寸对传热的影响。结果表明，对于给定的喷射温度，每单位表面从液滴中提取的总能量对液滴尺寸不敏感。在本文中，平均液滴温度是通过两色激光诱导的荧光来测量的。

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