An experimental study of the ignition and combustion characteristics of Al/Mg fuel-rich propellant at lower ambient
pressures was performed. Measurements were obtained in a sealed vessel capable of reaching pressures as low as 0.1 atm
with the application of vacuum pump. The ignition delay time was obtained by photodiodes which monitor the laser signal
and flame signal; the linear burning rate of propellant was obtained by processing the continuous high-speed video images.
The experimental results show that the reduction in pressure caused a longer ignition delay time, this dependence will get
weaker as the externally applied heat flux increased; the linear burning rate reduced with the reduction of pressure, even
reduced about 47% at 0.1atm compared to constant pressure.
The ignition and combustion characteristics of nitrate ester plasticized polyether (NEPE) propellant in different oxygen concentrations ambient gases were studied by the application of CO2 laser, infrared thermometer and high speed camera. The flame intensity data of the propellant was collected by the photodiode; propellant flame temperature was measured by infrared thermometer. The experimental results show that the time which NEPE propellant spend to be stable combustion will get shorter with the increase of oxygen concentration; the flame peak temperature measured by infrared thermometer increases with the increase of oxygen concentration when the oxygen concentration is less than 30% by volume, then decreases with the increase of oxygen concentration.