Abstract：By analyzing planar laser-induced fluorescence (PLIF) images, the key parameters such as flame surface density (Σ), flame brush thickness and turbulent combustion velocity in the turbulent flame can be obtained, and the three-dimensional (3D) flame structure can be reconstructed based on two-dimensional (2D) PLIF images and the key parameters. It is not clear, however, whether the 2D PLIF images can accurately reflect the 3D flame structure. In this study, the 2D OH distribution of methane/air turbulent premixed flames was measured using orthogonal PLIF in both horizontal plane (perpendicular to the flame propagation direction)and vertical plane (parallel to the flame propagation direction), and the Σ was calculated by analyzing the OH-PLIF images. The Σ in the two planes were obtained under various conditions, i.e., different exit velocities, different locations, and different equivalence ratios. The results showed that the Σ in the vertical plane was smaller than that in the horizontal plane under almost all the conditions, and the difference in Σ between the two planes is decided by the burner exit velocity, the location, and the equivalence ratio. This phenomenon shows that the 2D PLIF technique has some limitations in accurately reflecting the 3D flame structure.
基金资助: National Natural Science Foundation of China (91541119，51320105008，91541203)
通讯作者:
李 博
E-mail: boli@tju.edu.cn
作者简介: LI Hong, (1993—), a Postgraduate Student in College of Mechanical Engineering, Tianjin University
e-mail:
2015201016@tju.edu.cn
引用本文:
李 红，高 强，李晓峰，张大源，李 博，尧命发，李中山. 基于正交PLIF技术来评估2D火焰图像在反映锥形火焰3D结构方面的有效性[J]. 光谱学与光谱分析, 2020, 40(09): 2968-2973.
LI Hong, GAO Qiang, LI Xiao-feng, ZHANG Da-yuan, LI Bo, YAO Ming-fa, LI Zhong-shan. Evaluating the Validity of 2D Images in Reflecting the 3D Structure of a Symmetrical Cone Flame Using Orthogonal Planar Laser-Induced Fluorescence. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2020, 40(09): 2968-2973.
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