基于大涡模拟的液滴蒸发液相传热过程  

Liquid phase heat transfer process of droplet evaporation based on large eddy simulation

作　　者：赵鹏[1] 李国岫[1] 

机构地区：[1]北京交通大学机械与电子控制工程学院,北京100044

出　　处：《北京交通大学学报》2013年第3期32-36,共5页JOURNAL OF BEIJING JIAOTONG UNIVERSITY

基　　金：国家自然科学基金资助项目(51076008);中央高校基本科研业务费专项资金资助(M11JB00300)

摘　　要：建立了燃油液滴蒸发瞬态气液两相流大涡模拟流体体积(VOF)模型,综合考虑了气液两相流流场,气液相界面的温度梯度和浓度梯度等因素,研究了气液相温度梯度和雷诺数对液滴液相传热的影响.研究结果表明:随着温度梯度的增大,液滴温度显著提高,温度梯度越大,液滴温度增加幅度越大;雷诺数不仅能够影响液滴周围流场的分布,而且还引起液滴内部温度场分布的变化;随着雷诺数的增大,液滴内部加热区域逐渐均匀,雷诺数越大,液滴的温度越高.The gas-liquid two-phase flow LES-VOF model of droplet evaporation was established. The flow field of gas-liquid two-phase flow, the temperature gradient and the concentration gradient of the vapor-liquid interface were considered. The effect of heat transfer under different temperature gradients and Reynolds numbers was investigated. The results show that as the temperature gradient increases, the droplet temperature significantly is increased. The larger the temperature gradient is, the greater the magnitude of the droplet temperature is increased. Reynolds number can affect not only the distribution of droplet flow field around, but also cause the change of the temperature distribution of the droplet. As the Reynolds number increases, the droplet internal heating area becomes gradually evenly. The large the Reynolds number is, the higher the temperature of the droplet is.

关 键 词：液滴蒸发 大涡模拟 流体体积 传热 温度梯度 雷诺数 

分 类 号：TK421[动力工程及工程热物理—动力机械及工程]