乙醇液滴在高温氮气环境下的运动蒸发特性  

Motion and Evaporation Characteristics of Ethanol Droplet in High Temperature Nitrogen Environment

作　　者：刘璐[1] 黄家荣[1] 米梦龙[1] 

机构地区：[1]华北电力大学能源动力与机械工程学院,河北保定071003

出　　处：《应用能源技术》2014年第1期46-50,共5页Applied Energy Technology

基　　金：河北省自然科学基金项目(E2012502069);中央高校基本科研业务费专项资金资助项目(11QG62)

摘　　要：为达到新型燃料发动机高效工作的目的,基于质量、动量、能量方程,对单个乙醇液滴在高温氮气环境下的运动和蒸发过程建立数学模型,通过与实验数据对比,验证了模型的有效性。分析了不同环境压力下,液滴温度、速度、尺寸与时间和贯穿距离的关系。结果表明:环境压力越高,瞬态和平衡蒸发阶段时间越长,温度越高;液滴运动速度下降越快,贯穿距离越短;蒸发速度越慢,液滴寿命越长。在液滴速度连续变化的距离内,液滴温度逐渐上升,而尺寸略有膨胀,随环境压力升高,瞬态阶段的膨胀越显著。In order to achieve high efficiency of new fuel engine, a mathematical model based on mass, momentum and energy equations was developed to describe the motion and evaporation process of a single ethanol droplet in high temperature nitrogen environment. By comparing the numerical results with experimental data, the model validation was confirmed. The relationships of droplet temperature, velocity, size with time and penetration distance under different ambient pressure were analyzed. The calculated results indicate that with a higher ambient pressure, the transient stage and the equilibrium evaporation stage are longer, the droplet temperature is higher; the decline rate of droplet velocity is faster, the penetration distance is shorter; the evaporation rate is slower, and the droplet hfe is longer. Within the distance where the droplet velocity continuous variation, the droplet temperature rises gradually, the droplet size expands slightly, and with the increase of ambient pressure, the droplet expansion during the transient stage is more significant.

关 键 词：液滴 蒸发 环境压力 乙醇 

分 类 号：TK124[动力工程及工程热物理—工程热物理]