基于辐射成像的固体燃料燃烧温度测量技术综述

Review of solid fuel combustion temperature measurements based on radiation imaging

概述了目前常用于固体燃料火焰温度测量的非接触燃烧检测技术,并对基于辐射成像的燃烧检测技术的应用与研究现状进行详细综述,指出此测温方法虽然成本低且易应用实施与工业现场,但仍存在后处理复杂、精度不够等方面的局限与不足。最后针对介质场辐射特性参数及火焰三维温度场重建问题指出非均匀介质场中气相吸收、凝相吸收与散射及反射作用的各项参数会随组分浓度、温度和波长而变化,采用更高阶模型拟合参数可大大提高测量精度;通过研究和实验建立测量目标发射率与材料类型、温度、粗糙度及氧化等因素之间的关系,可得到更精确结果;采用贴近实际情况的方法处理燃烧介质空间内散射与反射过程实现辐射成像精确建模;基于成像像素达到的最大空间分辨率水平推进火焰三维结构的精细重构。

The commonly used non-contact combustion detection technology in the measurement of solid fuel flame is introduced in this paper.The application and research status of combustion detection technology based on radiation imaging are reviewed in de- tail.h has been pointed out that even although the method is cost-effective and easy to be used in the industrial sites,there are still limitations and deficiencies on several issues, such as post-processing complexity and lack of precision. Finally, it has been shown that the parameters of gas phase absorption, coagulation absorption, scattering and reflection in non-uniform media field may be changed with the concentration of the components, temperature and wavelength.Therefore, the measurement accuracy could be great- ly improved when a higher order model was used to fit parameters for the problems of radiation characteristics of the media field and reconstruction of 3-D flame temperature field. Also,more accurate results can be obtained,if the relationship between target emissiv- ity and material type, temperature, roughness and oxidation was established. Besides, the scattering and reflection processes in the combustion medium space have been used to accurately model the radiation imaging.The fine reconstruction of flame 3-D structure could be promoted by the maximum spatial resolution of imaging pixel.