镁粉粒度对Mg/PTFE贫氧推进剂燃烧性能的影响

Effect of Magnesium Powder Particle Size on Combustion Properties of Mg/PTFE Fuel-rich Propellant

为研究镁粉粒度对Mg/PTFE贫氧推进剂燃烧性能的影响,采用粒度为86.66,56.89,29.97,25.55μm的四种球形镁粉与聚四氟乙烯粉复合处理,DTA-TG分析热分解特性,用高速摄影仪测推进剂线性和质量燃烧速度,用红外测温仪测其火焰温度。实验结果表明:随着镁粉粒度的减小,复合物的热分解峰温度降低不明显,但推进剂的质量燃速和线燃烧速度显著提高,增幅最多达3倍,燃烧火焰温度也随之升高了170℃。

The effect of magnesium powder particle size on the combustion properties of Mg/PTFE fuel-rich propellant was studied.The thermal properties of Mg/PTFE were studied by using differential thermal analysis（DTA）and thermogravimetry（TG）.The linear and molar burning rate were measured by high speed photography,and the flame temperature was surveyed by infrared radiation thermometers.The results show that reducing magnesium powder＇s size had little weight on thermal analysis but steps up burning velocity even more than three times.The flame temperature of pyrotechnic fuel rich propellant heighten about 170 ℃ along with the diameter of magnesium powder decrease.