基于激光吸收光谱技术测量瞬态超声速流场温度

Temperature Measurement of Instantaneous Supersonic Flow Based on Absorption Spectroscopy Technology

燃烧过程的准确、实时诊断对研究燃烧机理、提高燃烧效率、降低污染物排放等至关重要。简要介绍了可调谐二极管激光吸收光谱(TDLAS)技术的测温原理,通过选择水在1397nm附近的两条邻近吸收线,运用多功能数据采集卡对二极管激光器进行控制和信号采集,实现了TDLAS技术波长扫描直接吸收法对瞬态超声速流场温度的测量,获得了瞬态超声速流场温度随喷流时间的演化过程,测量重复频率为1kHz。

Accurate and real-time diagnostics of combustion process is critical to understand combustion mechanism, improve combustion efficiency and reduce the production of pollutants. The thermometry of tunable diode laser absorption spectroscopy （TDLAS） technique is briefly introduced. Two adjacent water lines near 1397.75 nm are selected, and the TDLAS measurement system is established by using a multifunctional data acquisition （DAQ） card for signal processing and diode laser control. The measurements are performed on the instantaneous supersonic flow, the measure repetition freouencv is 1 kHz. and the temperature of the evolution of supersonic flow is acquired.