基于流体体积方法的燃油液滴蒸发过程数值模拟研究

doi:10.3969/j.issn.1000-1093.2013.11.003

兵工学报 ›› 2013, Vol. 34 ›› Issue (11): 1359-1365.doi: 10.3969/j.issn.1000-1093.2013.11.003

基于流体体积方法的燃油液滴蒸发过程数值模拟研究

赵鹏，李国岫，张涛，贾涛鸣

（北京交通大学机械与电子控制工程学院，北京 100044）

收稿日期:2013-05-07 修回日期:2013-05-07 上线日期:2014-01-22
作者简介:赵鹏（1983—），男，博士研究生。
基金资助:
国家自然科学基金项目(51076008)；高等学校博士学科点专项科研基金项目(20110009110023)；中央高校基本科研业务费专项(M11JB00300)

Numerical Study of Fuel Droplet Evaporation Process by Using VOF Model

ZHAO Peng， LI Guo-xiu， ZHANG Tao， JIA Tao-ming

(School of Mechanical and Electronic Control Engineering, Beijing Jiaotong University, Beijing 100044, China)

Received:2013-05-07 Revised:2013-05-07 Online:2014-01-22

摘要/Abstract

摘要： 建立了基于气液两相流流体体积（VOF）方法的燃油液滴蒸发的数学计算模型，研究了燃油液滴蒸发过程中的传热传质特性及强制对流流场对传热传质特性的影响。研究发现，燃油液滴在蒸发过程中，液滴内部并不是均匀加热，而是热点区域加热较快，其他区域缓慢加热。在初始时刻时，燃油液滴相界面处的蒸气与周围气体之间的浓度梯度较大，因此初期的蒸发速率较快，其谢伍德数Sh也较大。不同气液相温度差能促进液滴的蒸发过程，随着气液相温度差增大，液滴蒸发速率逐渐增大。随着雷诺数的增大，高温热点区域的分界线逐渐模糊，液滴内部加热逐渐趋于均匀。雷诺数越大，液滴的温度越高，但液滴温度差别较小。不同雷诺数能有效促进液滴的蒸发过程。

关键词: 流体力学, 气液两相流, VOF模型, 液滴蒸发, 传热传质

Abstract: A large eddy simulation VOF model is established for the fuel droplet evaporation. The heat and mass transfer characteristics of fuel droplet evaporation in forced convection flow field are investigated. The trend of droplet evaporation is researched by comparing and analyzing the results of heat and mass transfers. The results show that the heat transfer of droplet is not uniformly, but the hot zone is rapidly heated while other zone is slowly heated in the process of droplet evaporation. At the initial time, since the concentration gradient of the fuel droplet at the interface between the vapor and the surrounding gas is high, the initial evaporation rate is rapid and Sh number is larger. Different temperature difference can promote the evaporation process of the droplets. The evaporation rate increases with the increase of the temperature difference.

Key words: fluid mechanics, gasliquid twophase flow, VOF model, droplet evaporation, heat and mass transfer

中图分类号:

TK421

赵鹏，李国岫，张涛，贾涛鸣. 基于流体体积方法的燃油液滴蒸发过程数值模拟研究[J]. 兵工学报, 2013, 34(11): 1359-1365.

ZHAO Peng， LI Guo-xiu， ZHANG Tao， JIA Tao-ming. Numerical Study of Fuel Droplet Evaporation Process by Using VOF Model[J]. Acta Armamentarii, 2013, 34(11): 1359-1365.

参考文献

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基于流体体积方法的燃油液滴蒸发过程数值模拟研究

Numerical Study of Fuel Droplet Evaporation Process by Using VOF Model

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