关键词: 二极管激光;激光探测;脉冲爆震发动机

Abstract: Newly developed diode laser absorption techniques for in situ measurements of flow properties were adapted to pulse detonation engines (PDEs). Two diagnostic concepts were presented and demonstrated: a sensor employing four multiplexed diode lasers operating in the 1 300 mm-1 800 nm spectral region for monitoring gas temperature and H2O concentration and a two wavelength modulated diode laser diagnostic for sensing soot temperature and soot volume fraction. The important parameters, such as temperature of post detonation gases, species mole fraction, soot volume fraction and soot temperature, were determined. Good agreement with the results from conventional methods permits confidence in measurement accuracy. The sensors’ fast time response and non intrusive nature make them suitable and convenient for measurements in the hostile environments generated by PDEs. The success of these measurements demonstrates the potential of diode laser sensors for PDE model validation and possible use for on-board sensing and control systems.

Key words: Diode lasers;laser detection;Pulse detonation engine