论文部分内容阅读
利用平面激光诱导荧光(OH-PLIF)技术测量了CH_4/air预混湍流火焰前锋面结构,通过图片处理得到了测量平面上的二维火焰面密度。基于不同的假设建立了三种不同模型,利用二维探测得到的火焰面信息来估计三维火焰面密度在测量面上的值,通过积分三维火焰面密度估计值得到燃烧系统的燃料消耗率。结果表明,预混湍流火焰前锋面为凹凸的褶皱结构,平面测量的二维火焰面密度明显低估了真实的火焰面密度,利用模型估计得到的3D火焰面密度对2D值有明显的改善。燃烧系统的燃料消耗率可以用来评估模型的可靠性,结果表明模型的误差都在40%以内。
The structure of CH_4 / air premixed turbulent flame front was measured by planar laser-induced fluorescence (OH-PLIF) technique. The two-dimensional flame surface density of the measured plane was obtained by image processing. Based on the different assumptions, three different models were established, and the value of the three-dimensional flame surface density on the measurement surface was estimated by using the two-dimensional flame surface information. The fuel consumption rate of the combustion system was obtained by integrating the three-dimensional flame surface area density estimation. The results show that the front surface of the premixed turbulent flame is concave and convex corrugated structure. The 2D flame surface density measured by the plane obviously underestimates the real flame surface density. The 3D flame surface density estimated by the model can obviously improve the 2D value. The fuel consumption rate of the combustion system can be used to evaluate the reliability of the model, the results show that the model errors are within 40%.