Measurement of PDRE plume based on TDLAS technology

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 H₂O lines near 7185.597 cm^-1, and 7444.352 cm^-1 +7444.371 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 2004 K and 0.2379, respectively. In addition, there were a lot of incomplete combustion products in the plume. When the operation frequency was increased to 5 Hz, the peak temperature and steam concentration of the plume reached 2294 K and 0.3821, respectively; however, the flame-holding phenomenon was observed at the terminal stage of the operation.