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为了分析POM(共聚甲醛)降低无烟XLDB推进剂在1～5MPa内燃速的原因,分别测量和分析了含和不含POM的推进剂样品的PDSC(高压热分解)特征量,燃烧波及火焰结构的变化。通过实验发现POM在1～5MPa下使ΔH(推进剂的分解焓)减小265～214J/g;POM在1MPa,5MPa下使推进剂的燃面温度分别由481℃和628℃降至433℃和569℃;理论计算表明:POM在10MPa下使推进剂的爆热、燃温分别由4418.4J/g,3031K降至4397.4J/g,3015K。结果表明,POM对无烟XLDB推进剂的热分解及燃烧过程有明显的抑制作用,这一作用可能降低无烟XLDB推进剂在1～5MPa范围内的燃速。
In order to analyze the reason why POM decreases the internal combustion rate of 1 ~ 5MPa for non-smoke XLDB propellants, PDSC (high pressure pyrolysis) characteristic quantities of propellant samples with and without POM were measured and analyzed. The combustion wave and flame structure The change. The experimental results show that POM decreases the ΔH (enthalpy of decomposition) from 265 to 214 J / g at 1 ~ 5 MPa; POM reduces the burning surface temperature of propellants from 481 ℃ and 628 ℃ to 433 ℃ at 1MPa and 5MPa, respectively And 569 ℃, respectively. The theoretical calculation shows that the detonation and combustion temperatures of propellants dropped from 4418.4J / g and 3031K to 4397.4J / g and 3015K respectively at 10MPa. The results showed that POM significantly inhibited the pyrolysis and combustion of the smokeless XLDB propellant, which may reduce the burning rate of the smokeless XLDB propellant in the range of 1 ~ 5MPa.