低压下V形火焰稳定器回流区流动特性研究

 符号表 x、y、z:坐标方向、大小（mm） y₀:零速度线纵向坐标 W:稳定器槽宽（mm） λ:微尺度（mm） P:压强（MPa） ρ:密度（kg/m³） V₀:来流速度（m/s） Re:雷诺数 :x向平均速度（m/s） u、v:x、y向脉动速度（m/s）uv、u²:速度相关量(m²/s²)m:回流量(单位横向宽度)(kg/s)ψ：流函数,钝体后回流区和主流强烈的紊流交换对燃烧室的火焰稳定性和燃烧效率起着有利的作用。

EXPERIMENTAL INVESTIGATION ON FLOW CHARACTERISTICS OF THE RECIRCULATION ZONE BEHIND VEE-GUTTER FLAMEHOLDER

The flow characteristics of the recirculatiou zone behind the v-guttcr flamcholcler were investigated experimentally under sub-atmosphcrc in this paper by use of a hot-wire anemometry.Two dimensional test section with a side face of glass is used.Its size is 100 × 150mm2.The distributions of the local mean velocity .turbulent intensity,Reylond stress,turbulent scale, the size of recirculation zone, relative mass flow rate were obtained. The results show that the factors above metioned arc reduced with decreasing the pressure under sub-atmosphere.The turbulent scale is increased with decreasing the pressure. The reduction of flow characteristics above and increase of turbulent scale worsen the combustion performance of fuel-air mixture in the afterburner under sub-atmosphere.Thus a new basis was provided for analysing the combustion performance of v-gutter flameholder in a afterburner under sub-atmosphere from the fluid mechanics.