摘要
为研究瓦斯燃烧器的火焰特性 ,采用k ε湍流模型、三气体扩散燃烧模型及综合辐射模型 ,对旋流稳焰瓦斯燃烧器湍流扩散火焰进行了数值模拟。研究结果表明 ,在旋流作用下 ,在火盆及其前端附近区域内形成了中心回流区 ,使燃气与助燃空气在此处发生剧烈掺混而被点燃 ,这有利于火焰稳定。在火焰前端仍存在一个高温尾流区 ,在选用和设计燃烧器时应充分考虑这一现象。燃气喷孔直径对火焰长度的影响非常显著 ,喷头顶部气孔位置和火盆锥口角对火焰长度影响较小。随着空气过剩系数和燃气中空气含量的增加 ,火焰长度明显减小。在实际应用中 ,应充分考虑燃烧器结构和操作条件的影响 ,以提高加热炉的效率和安全性。
The k-ε turbulent model,three-gas mixing combustion model and composite radiation model were applied to numerical simulation of the turbulent diffusion flame in a gas burner with spinning air. The results show that gas and air are mixed and burned rapidly with air spinning in the burner tile and near the front of the burner tile,and a central back flow region is formed. A high-temperature flow region exists in the front of the flame. The diameter of the gas orifice has a great influence on the flame length, and the position of the top gas orifice and the cone angle of the burner tile have a little effect on the flame length. As the excess coefficient of air and the air content in the combustion gas increase, the flame length decreases gradually. In the practice, the structures of burner and the operating conditions should be considered in order to enhance the efficiency and safety of the burner.
出处
《石油大学学报（自然科学版）》
EI
CSCD
北大核心
2003年第5期70-72,共3页
Journal of the University of Petroleum,China(Edition of Natural Science)
关键词
瓦斯燃烧器
湍流模型
扩散火焰
数值模拟
燃烧模型
辐射模型
加热炉
gas burner
turbulent
diffusion flame
numerical simulation
turbulent model
three-gas mixing combustion model
radiation model
