【摘要】 通过分析平面激光诱导荧光(PLIF)图像,可获得火焰中的火焰面密度(Σ)等参数.但目前少有工作将基于不同组分测量的Σ进行比较.针对这一问题,应用PLIF技术同时测量甲烷/空气预混湍流火焰的OH和CH2O分布,通过分析OH-PLIF和CH2O-PLIF的图像计算Σ,并比较不同火焰条件下两种计算方法的差别,得到如下结果:在y/d较小的火焰区域两种计算方法得到的Σ值基本一致;随着燃烧器出口速度增加或当量比接近1,在更小的y/d下两种计算方法测量得到的Σ值基本吻合.更多还原

【Abstract】 The flame surface density（Σ） can be obtained by analyzing the plane laser-induced fluorescence（PLIF） image parameters. However,few researchers have addressed different Σ measurements based on different components. To this end,the PLIF technique was used to simultaneously measure the OH and CH₂O distribution in premixed methane/air turbulent flames. Σ was calculated by analyzing the images of OH-PLIF and CH₂O-PLIF,and the differences between the two calculation methods under different flame conditions were compared. The Σ values obtained by the two calculation methods in smaller y/d flame areas were identical. As the burner exit velocity increases or the equivalence ratio approaches the unity,the Σ values measured by the two calculation methods at the smaller y/d are consistent.更多还原