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应用高速摄影系统和图像处理技术研究了煤油液滴在温度473~773 K、压力1.0~4.0 MPa静止气体环境下的蒸发过程,得到了环境温度与环境压力对煤油液滴特性的影响规律。实验结果表明:环境温度低于573 K时,煤油液滴蒸发D2曲线不符合d2定律;环境温度高于673 K低于773 K时,液滴直径变化与d2定律吻合。环境压力对液滴蒸发的影响与环境温度密切相关,环境温度低于473 K时,随着环境压力的升高,液滴蒸发速率变慢;环境温度高于673 K时,随着环境压力的升高液滴蒸发速率加快。
The evaporation process of kerosene droplets at 473 ~ 773 K and pressure of 1.0 ~ 4.0 MPa in still gas was studied using high-speed photographic system and image processing technology. The influence of ambient temperature and ambient pressure on the properties of kerosene droplets was obtained. The experimental results show that when the ambient temperature is lower than 573 K, the curve D2 of kerosene droplet evaporation does not accord with the d2 law. When the ambient temperature is higher than 673 K and lower than 773 K, the droplet diameter changes coincides with d2 law. The influence of ambient pressure on the droplet evaporation is closely related to the ambient temperature. When the ambient temperature is lower than 473 K, the droplet evaporation rate becomes slower with the increase of ambient pressure. When the ambient temperature is higher than 673 K, Elevate droplet evaporation rate faster.