Abstract:

The temperature measurement of combustion flame is very useful in studying flame structure, fuel mixing and combustion,and stable operation and control of combustion equipment. In this paper, the high speed optical sectioning method is introduced to reconstruct the flame temperature field. A 3-D irradiance body can be regarded as a combination of a set of 2-D luminous sections and the corresponding image of the 3-D irradiance body can be regarded as the superposition of the focused and the defocused images. Focusing on each section and taking photos using a single CCD camera, the original luminosity distribution of each section can be retrieved by using the image inversion algorithm. Furthermore, based on the relationship between luminosity and temperature, the temperature distribution of flame can be reconstructed. The candlelight experimental results prove the feasibility of the method and reveal the internal radiation structure of flame. It can be used as a new measurement and diagnostic tool for quantitative characterization of a combustion flame and other two-phase flow parameters field.