基于 TDLAS 的脉冲爆震发动机燃气温度测量

Aiming at the online temperature measurement of the burning gas in pulse detonation engine(PDE)，based on tunable diode laser absorption spectroscopy(TDLAS)，the scanning wavelength direct absorption-time division multiplexing strategy is adopted，and H₂O molecule is used as the target component. The burning gas temperature measurement system was designed and applied to the burning gas temperature measurement of PDE. The H₂O molecule absorption spectra of(7 444.352＋7 444.371)-(7 185.587＋7 185.597)cm^-1 spectral line pair of burning gas in PDE were obtained，and the online temperature measurement of the burning gas in PDE under 5 Hz，10 Hz，15 Hz，20 Hz，25 Hz，30 Hz working frequency was realized based on the two-line temperature measurement principle. The temperature measurements in PDE under different operating frequencies were discussed in detail. It shows that the online temperature measurement of burning gas in PDE can be realized based on TDLAS. The peak temperature of the detonation wave gas in PDE under 5 Hz working frequency is 1 868 K，and there are two distribution steps of 618 K and 424 K after the detonation wave passed. The temperature variation regularity of PDE under different operating frequencies is similar，but with the increase of operating frequency，the temperature of the burning gas increases. It provides data support for the combustion optimization and performance evaluation of PDE.