中文摘要：

应用可调谐半导体激光吸收光谱（TDLAS）测试技术，采用直接吸收-时分复用技术，选择7185．597cm^-1和7444．352cm^-1＋7444．371cm。水分子的吸收线，开展对脉冲爆震发动机（PDRE）尾焰参数测量实验．PDRE在1Hz工作频率下测量结果显示，尾焰峰值温度2004K，H20摩尔分数峰值为0．2379，尾气中含有大量不完全燃烧产物；通过对PDRE供给参数和TDLAS系统的调整，5Hz工作频率下测量结果显示，尾焰峰值温度2294K，H20分子摩尔分数峰值0．3821，PDRE工作后期出现连续燃烧．

英文摘要：

Tunable diode laser absorption spectroscopy sensors system based on scanned wavelength direct absorption spectroscopy and time division multiplexing strategy were employed in this study. Gas temperature is determined by the absorption ratio of a H20 lines near 7 185.597 cm 1, and 7 444.352 cm^-1 ＋7 444.371 cm^-1. Experimental studies on the PDRE plume were carried out at different operation frequencies. The results showed that, when the operation frequency was 1 Hz, the peak temperature and steam concentration of the plume were 2 004 K and 0.237 9, respectively. In addition, there were a lot of incomplete combustion products in the plume. When the operation frequency was increased to 5Hz, 0.382 1, respectively; however, the peak temperature and steam concentration of the plume reached 2 294 K and the flame-holding phenomenon was observed at the terminal stage of the operation.