论文部分内容阅读
为研究不同海拔处大气氧含量(氧体积分数)变化对铝镁贫氧推进剂燃烧特性的影响,采用激光辐射点火,使用高速摄影仪记录推进剂的点火与燃烧过程,并利用红外测温仪测量推进剂的表面温度及火焰温度,研究了环境氧含量与压力对推进剂的点火过程、火焰温度和燃速的影响。结果表明,环境气体氧含量高于推进剂热解产物中氧含量时,点火气相化学反应主要发生在推进剂热解产物与环境气体的扩散区,初现焰远离推进剂表面,但随着压力增加,扩散区与推进剂表面之间距离减小;火焰温度与环境氧含量和压力线性正相关;压力与环境氧含量增加时,铝镁贫氧推进剂燃速增加,压力和环境氧含量对铝镁贫氧推进剂燃速的影响符合B数理论,压力是影响推进剂燃速的主要因素,但随着压力增加,压力对燃速的影响相对减小,压力从0.1 MPa增加到1.5 MPa时,压力和环境氧含量的燃速敏感系数比从200下降到40。
In order to study the effect of atmospheric oxygen content (oxygen volume fraction) on the combustion characteristics of Al-Mg-depleted propellants at different altitudes, laser ignition and high-speed camera were used to record the ignition and combustion process of propellants. Infrared thermometer The surface temperature and flame temperature of the propellant were measured. The effects of ambient oxygen content and pressure on the ignition process, the flame temperature and the burning rate of the propellant were investigated. The results show that when the oxygen content of the ambient gas is higher than the oxygen content of the pyrolyzate of the propellant, the ignition gas phase chemical reaction mainly occurs in the diffusion zone of the pyrolyzate and the ambient gas of the propellant, and the initial flame is away from the propellant surface. The distance between the diffusion zone and propellant surface decreases; the flame temperature is positively correlated with ambient oxygen content and pressure linearity; when the pressure and ambient oxygen content increase, the burning rate of aluminum-magnesium oxygen-poor propellant increases, and the pressure and ambient oxygen content The influence of the burning rate of Al-Mg-depleted propellant is in line with the B-number theory. Pressure is the main factor that affects the burning rate of the propellant. However, with the increase of the pressure, the influence of the pressure on the combustion rate is relatively reduced. The pressure increases from 0.1 MPa to 1.5 MPa When the pressure and the oxygen content of the combustion rate sensitivity coefficient decreased from 200 to 40.