【摘要】 贫预混低旋旋流燃烧是增强火焰稳定性和控制NOx排放的有效手段,旋流器安装角对于火焰稳定性和流场结构具有重要影响。对两个不同安装角的低旋流燃烧器吹脱极限和冷、热态流场进行了测量分析。结果表明,吹脱旋流数与当量比呈线性关系,旋流器安装角较大时燃烧器稳定火焰的能力受当量比的影响较大。发散角、回流区和湍动能均受旋流器安装角变化的影响。更多还原

【Abstract】 Lean premixed low swirl combustion is an effective method to strength flame’s stability and control NOx emission.Swirler setting angle has an important effect on the blow off limit and flowfields of flames.Measurements of blow off limit and velocity fields of premixed natural gas flames stabilized by low swirl burner have been carried out.The results show that a linear relationship exists between blow off swirl number and equivalence ratios.The flame downstream the swirler with larger setting angel is easily influenced by the variety of equivalence.Divergent angle,recirculation zone and turbulent kinetic energy profiles vary significantly with swirler setting angle.更多还原