基于图像处理的湍流轴对称火焰体积与表面积计算方法

Calculation of turbulent axisymmetrical flame volume and surface area based on image processing

基于"圆柱体法"思想设计出轴对称火焰的火焰体积和表面积计算公式,以25cm×25cm正庚烷油池火为例,采用灰度阈值法提取其火焰区域,进而计算轴对称火焰的体积和表面积,并讨论灰度阈值对火焰区域提取、火焰体积与表面积计算的影响。结果表明:本文所述方法可以简便地计算湍流轴对称火焰的火焰体积和表面积;火焰体积与表面积随灰度阈值增大而减小且灰度阈值变化对火焰体积的影响幅度约为对火焰表面积影响幅度的两倍。

A formula is developed to calculate the volume and surface area for axisymmetrical turbulent flame. The flame region is extracted from the video of heptane pool fire using the gray-level threshold method, and then to calculate flame volume and surface area. The method results in effective calculations, and the flame volume and surface area decrease with increasing gray threshold. The effect of the gray threshold on the calculation of flame volume is nearly tvciee as much as that for flame surface area.