摘要
为了改进燃烧器设计,提出了一次风扩口角度改变对同轴旋流燃烧器影响的数值模拟方法.该方法采用重整化群RNGκ-ε双方程湍流模型,针对燃烧器出口区域冷态流场进行数值模拟,通过比较旋流燃烧器不同一次风扩口角度情况下,回流区尺寸的变化和流场分布规律.结果表明,旋转射流轴向速度受一次风扩口角变化影响不大,其切向速度在旋流外围服从拟等势旋涡规律和在旋流中心服从刚体旋转规律;随一次风扩口角度的增大,回流区径向尺寸绝对增大,轴向尺寸先增加后减小;一次风扩口角度的增大,引起径向压力梯度的增大,从而形成了多次回流区域的存在.
To provide a reference for future burner design, a numerical simulation method on the influence on coaxle swirl burner of change of flaring angle of primary air tube was proposed. The method used the turbulent model with κ-ε equations based on the renormalization group theory to simulate cold flow field of burner outlet. Study of the flow filed distribution and the change of the back flow size relative to the different primary air tube flaring angles of the co-axis swirl burner showed that the swirl jet axle velocity changes little with the increase of the primary air tube flaring angles, and that the radial width of back flow increases and the axle length first increases then decreases slightly. And the increase of radial pressure gradient results in the existence of several back flow fields.
出处
《浙江大学学报（工学版）》
EI
CAS
CSCD
北大核心
2006年第10期1819-1822,共4页
Journal of Zhejiang University：Engineering Science
关键词
旋流燃烧器
数值模拟
刚流区
扩口角度
流场
swirl burner
numerical simulation
back flow
flaring angle
flow field
