Premixed Flames in Counterflow Jets Under Rigid-Body Rotation
Premixed Flames in Counterflow Jets Under Rigid-Body Rotation
复制标题
刚体旋转逆流射流中的预混火焰
DOI：
10.1080/00102208708960314
复制
发表时间：
1985
影响因子：
1.9
通讯作者：
S. Sohrab
中科院分区：
文献类型：
--
作者：
Z. H. Chen;G. Liu;S. Sohrab
摘要 研究了刚体旋转的两个圆柱射流逆流中甲烷和丁烷双预混火焰的熄灭特性。使用激光多普勒测速仪，可以测量角速度相等的射流沿相反方向旋转时的轴向、径向和圆周速度分布。研究发现，合并并接近熄灭的两个对称的贫甲烷火焰随后将在喷射流旋转时再次分离。此外，随着角速度的增加，发现熄火时的燃料浓度首先下降到最小值，然后增加。这些趋势是根据观察到的火焰拉伸速率随其轴向位置的变化而描述的。此外，还建立了径向向内二次流的存在，该二次流在驻点平面两侧产生再循环区，其厚度随着喷射角速度的增加而增加...
Abstract The extinction characteristics of double premixed flames of methane and butane in counterflow of two cylindrical jets which undergo rigid-body rotation are investigated. Using laser Doppler velocimetry, the axial, radial and circumferential velocity profiles are measured when jets with equal angular velocity rotate in opposite directions. It is found that two symmetric lean methane flames which are merged and near extinction, will subsequently separate again upon the rotation of the jet streams. Furthermore, as the angular velocity is increased, the fuel concentration at extinction is found to first decrease to a minimum value and increase thereafter. These tendencies are described on the basis of the observed variation of the rate of stretch experienced by the flames as a function of their axial position. Also, the existence of radially inward secondary flows which produce recirculation zones on both sides of the stagnation plane are established whose thickness increase with the jet angular velo...