基于中红外吸收光谱技术测量高温流场CO浓度研究

CO是碳氢化合物燃烧的主要产物之一,准确测量超燃冲压发动机出口的CO浓度是评估碳氢燃料燃烧效率的重要依据.中红外波段的CO谱线相较近红外而言,具有吸收更强、谱线丰富且谱线对相对孤立、不受其他气体干扰等明显优势.本文基于中红外吸收光谱技术,计算研究了CO中红外光谱特性,选择了适用于高温流场CO测量的特征谱线,设计并搭建了...

Measurement of CO concentration in flat flame based on mid-infrared absorption spectroscopy

CO is one of the main products of hydrocarbon combustion. Accurate measurement of CO concentration at the scramjet outlet is an important basis for evaluating the combustion efficiency of the hydrocarbon fuel. Compared with the near infrared band, the CO absorption spectrum in the mid infrared band has the advantages of stronger absorption, rich spectral lines, relatively isolated spectral lines and no interference from other gases. Based on the mid infrared absorption spectrum technology, this paper studies the mid infrared spectrum characteristics of CO, selects the characteristic spectrum which is suitable for the measurement of CO in the high temperature flow field, designs and builds the CO concentration detection system in the high temperature flow field, carries out the CO measurement verification under different equivalence ratios of the plane flame, realizes the CO measurement of the high temperature flow field at the exit of a scramjet, and reflects the changes of concentration and temperature of CO during the combustion of aviation kerosene, thus providing powerful research means and abundant experimental data for the study of combustion and flow mechanism of the scramjet.