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为研究铝镁贫氧推进剂的点火特性,采用激光点火系统对推进剂在不同激光热流密度下进行了多组点火实验,结果表明:铝镁贫氧推进剂点火机理为凝聚相点火,激光热流密度在点火过程中起主导作用;在激光热流密度为176～646W/cm2的范围内,铝镁贫氧推进剂的点火延迟时间随着热流密度的增加而递减,且点火延迟时间变化趋缓。依据实验结果拟合出了不同热流密度下计算铝镁贫氧推进剂点火延迟时间的经验公式,该公式可计算激光热流密度在176～646W/cm2范围内铝镁贫氧推进剂的点火延迟时间。
In order to study the ignition characteristics of aluminum-magnesium oxygen-poor propellant, laser ignition system was used to carry out multi-group ignition experiments on the propellant under different laser heat flux density. The results show that the ignition mechanism of aluminum-magnesium oxygen poor propellant is condensed phase ignition and laser heat flow The density plays a leading role in the ignition process. When the laser heat flux is in the range of 176 ~ 646W / cm2, the ignition delay time of Al-Mg-depleted propellant decreases with the increase of heat flux, and the ignition delay time changes slowly. Based on the experimental results, the empirical formula for calculating the ignition delay time of aluminum-magnesium oxygen-poor propellant under different heat flux density is fitted. The formula can calculate the ignition delay time of aluminum-magnesium oxygen-poor propellant with laser heat flux density in the range of 176 ~ 646W / cm2 .