基于可调谐半导体激光吸收光谱技术的甲烷/空气预混平焰炉温度测量

燃烧场温度的测量对于燃烧诊断具有重要意义.开展了基于可调谐半导体激光吸收光谱(Tunable diode laser absorption spectroscopy, TDLAS)的在线测温方法研究,基于双光束分时扫描技术,实现了双激光器协同工作与燃烧产物水汽7154.35cm^-1和7467.77cm^-1两条吸收谱线的同时测量,并利用双线积分吸光度比值关系完成温度的精确反演,满足燃烧场温度在线检测应用需要.开展了针对甲烷/空气预混平焰炉火焰温度的实时检测实验研究,并与热电偶进行了测温对比分析,两种方法的测量具有较好的一致性,相对误差小于3.8%,验证了TDLAS技术对燃烧场温度非侵入式快速测量的可行性和可靠性.

Temperature Measurement of CH4/Air Premixed Flat Flame Burner Based on Tunable Diode Laser Absorption Spectroscopy

Temperature measurement is significant for combustion diagnosis. An on-line temperature measurement method based on tunable diode laser absorption spectroscopy(TDLAS) has been developed, which achieves dual laser cooperative work and simultaneous measurement of two absorption lines (7154.35 cm$^{-1}$ and 7467.77 cm$^{-1}$) of combustion product H$_2$O by dual beam time dividing scanning strategy. The accurate inversion of the temperature is realized by two-line integral absorbance ratio, which meets the application needs of on-line temperature detection of the combustion field. The experimental research on real-time detection of flame temperature in CH$_4$/air premixed flame furnace was carried out, and the results were compared with the thermocouple measurement, which shows TDLAS and thermocouples have good consistency with relative error less than 3.8\%. The feasibility and reliability of non-intrusive and rapid temperature measurement of the combustion field based TDLAS technology have been verified.