不同气氛对铝粉点火燃烧特性的影响分析  

Analysis of the Influence of Different Atmospheres on the Characteristics of Ignition and Combustion of Aluminum Powder

作　　者：杨建刚[1] 胡春波[1] 邓哲[1] 朱小飞[1] 

机构地区：[1]西北工业大学燃烧热结构与内流场重点实验室,陕西西安710072

出　　处：《火炸药学报》2017年第3期36-40,共5页Chinese Journal of Explosives & Propellants

基　　金：国家自然科学基金(No.51576166)

摘　　要：为了研究流化气体对粉末推进剂点火燃烧性能的提高作用,采用CO_2激光点火器和光纤光谱仪相结合的实验方法,研究了不同气氛条件下Al粉的点火燃烧特性。采用光谱信号拟合测温法计算了Al粉在不同气氛环境中的点火温度。结果表明,常压环境下,粒径1μm的Al粉在N_2O和空气氛围下的点火延迟时间分别为10ms和359ms,从点火成功过渡到全面燃烧的时间分别为829ms和1 579ms,说明Al粉在N2O环境中点火阶段的表面异相反应速率与燃烧阶段的反应速率均快于在空气中;粉径1μm的Al粉在N2O和空气环境下的点火温度分别为1 550~1 650K和1 450~1 500K,两者相近,但都明显低于毫米级Al粉的点火温度(2 300K),说明Al粉的点火温度受粒径影响较大。To study the improving effect of fluidization gas on the performances of ignition and combustion for powder propellant,the characteristics of ignition and combustion for aluminum powder were investigated under different atmosphere conditions using the experimental method of CO_2 laser igniter coupled with fiber optic spectrometer.The ignition temperature of aluminum powder under different atmospheres were calculated by measuring temperature method of fitting the spectral signal.The results show that the ignition delay of aluminum powder with the size of1μm under N2 O and air atmosphere is 10 and 359ms,respectively,and the transition time from successful ignition to full combustion is 829 and 1 579 ms,respectively,indicating that the heterogeneous reaction rate of aluminum surface in ignition stage and combustion stage is faster in N2 O than in air.The ignition temperature of aluminum powder with the size of 1μm in N_2O and air is 1 550-1 650 and 1 450-1 500 K,respectively,which are almost the same,but they are obviously lower than the ignition temperature of 2 300 Kof millimeter level aluminum powder,indicating that the particle size has an important effect on the ignition temperature of aluminum powder.

关 键 词：粉末火箭发动机 流化气 点火延迟 点火温度 铝粉 

分 类 号：TJ55[兵器科学与技术—军事化学与烟火技术] O643.21[理学—物理化学]