基于辐射光谱法的高温颗粒辐射传热参数在线测量方法研究

针对在高温燃烧环境中的颗粒辐射传热问题，基于普朗克辐射定律，提出了用于高温颗粒辐射传热参数在线测量的辐射光谱法，根据高温颗粒可见波段辐射光谱随波长变化情况，通过参数拟合方法直接获得颗粒温度及辐射强度等辐射传热参数。为验证该方法测量准确性，搭建了高温黑体炉辐射测量系统，实验测量结果显示：温度测量值与设定温度相对偏差小于3%；辐射强度测量值与理论计算值相对偏差小于5%。以此为基础，设计了应用于高温燃烧环境下的颗粒辐射传热参数测量的水冷结构探针，并利用该探针开展了高温燃烧环境气固两相流200～1 100 nm波段辐射光谱测量，基于上述方法，直接获得了高温颗粒温度、辐射强度等辐射传热参数沿截面分布情况，有效剥离了高温气体对流传热的影响，为高温颗粒辐射传热研究提供数据支撑。

Research on On-Line Measurements of Radiation Parameters for High-Temperature Particles Based on Radiation Spectroscopy

For the radiation heat transfer of particles in high-temperature combustion environment, radiation spectroscopy was presented to on-line measure radiation heat transfer parameters based on Planck’s law. According to the changes of radiation spectrums with wavelength in visible range, the temperature and radiation intensity of radiation heat transfer were obtained directly based on parameter fitting method. In order to verify the measurement accuracy, the measurement system of high-temperature blackbody furnace was built. The results of measurements showed that the relative deviation of temperature measurements and setting value was less than 3%, and the relative deviation of radiation intensity measurements and theoretical calculation value was less than 5%. On this basis, the water-cooled probe for radiation heat transfer parameters measurement of particles in high-temperature combustion environment was designed and applied to measure 200~1 100 nm radiation spectrums of gas-solid two phase flow in high-temperature combustion environment. The across section distribution of temperature and radiation intensity of high-temperature particles were obtained directly by using this method. It can eliminate influence of gas convective heat transfer effectively, and provide data support for research on radiation heat transfer of high-temperature particles.