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在-40℃下,通过落锤撞击制备了不同破碎程度的DAGR125和NR11发射药,利用染料吸附量表征了发射药的破碎程度,结合密闭高压爆发器实验,分析了破碎发射药结构特征与高压燃烧特征的关系。结果表明,随着小颗粒破碎发射药的增加,动态活度变化率在燃烧初始阶段发生转折。当破碎程度较小时,初始动态活度、染料吸附量均可衡量发射药初始燃面和破碎程度;当破碎程度较大时,利用传统方法获取的初始动态活度明显小于实际值,不适合用来表征初始燃面,而染料吸附量法更为准确。初始动态活度变化规律显示,当落锤高度大于60cm时,发射药药粒的破碎程度快速增加;动态活度变化规律显示,落锤高度分别大于23.0cm和23.1cm时,DAGR125和NR11破碎发射药整体燃烧过程由增面性转变为减面性。
At -40 ℃, DAGR125 and NR11 propellant with different degree of fragmentation were prepared by drop-hammer impact. The degree of fragmentation of propellant was characterized by the amount of dye adsorbed. Combined with the closed-cell high-pressure burst experiment, the structure characteristics of the propellant were analyzed. Burning characteristics of the relationship. The results show that with the increase of small particle propellants, the dynamic activity change rate turns in the initial stage of combustion. When the degree of crushing is small, the initial dynamic activity and the amount of dye adsorbed can both measure the initial burning surface and the degree of crushing of the propellant. When the degree of crushing is large, the initial dynamic activity obtained by the traditional method is obviously smaller than the actual value, To characterize the initial burning surface, while the dye adsorption method is more accurate. The dynamic change of initial dynamic activity showed that when the drop weight height was greater than 60 cm, the degree of fragmentation of the propellant drug rapidly increased. The dynamic change of dynamic activity showed that when the height of drop weight was greater than 23.0 cm and 23.1 cm respectively, the DAGR125 and NR11 fragmentation propellant The overall combustion process by the increase of the surface into a reduction of surface.