摘要
建立了研究燃料液滴在超临界环境下蒸发的计算模型,并对液滴的蒸发过程进行了编程计算。模型基于气液两相的守恒方程,并详细考虑了液滴表面的气液相平衡。模型采用了Peng-Rob inson(PR)状态方程。计算结果表明:超临界压力下,液滴周围气体在液相中的溶解很明显。燃料液滴只有在强超临界环境中蒸发时,液滴表面才能发生由亚临界状态到超临界状态的迁移;而在弱超临界环境中蒸发时,液滴表面不会发生迁移。随着环境压力的升高,液滴寿命先是下降然后升高;而当环境温度升高时,液滴寿命不断下降。
A comprehensive model was developed to investigate the fuel droplet vaporization under the supercritical environment condition, and the process of droplet evaporation was stimulated. The model is based on the conservation equations for both gas and liquid phases and a detailed treatment of liquid-vapor phase equilibrium on the droplet surface is considered. The model employs the peng-rohinson （PR） equation of state （EOS）. The results indicate that, the solubility of the ambient gas in the liquid phase is obvious at the supercritical pressure. The transition from the subcritical to the supercritical state will occur on the droplet surface when the droplet evaporates under the highly supercritical environment. While under the weakly supercritical environment, the transition will not happen. The lifetime of droplet shows the decreasing trend and then converts to the increasing trend with the increase of the ambient pressure. The lifetime of droplet decreases with the increase of the ambient temperature.
出处
《内燃机学报》
EI
CAS
CSCD
北大核心
2008年第1期55-61,共7页
Transactions of Csice
基金
国家自然科学基金资助项目(50376003)
关键词
超临界环境
燃料液滴
蒸发
Supercritical environment
Fuel droplet
Evaporation
