论文部分内容阅读
硼-硝酸钾是一种重要的含能材料,其氧/燃比与药剂的点火和燃烧性能有密切关系。为了掌握氧/燃比与激光点火性能的关系,对不同配比的硼-硝酸钾及其酚醛树脂掺杂物进行激光点火特性实验研究、热力学参数计算分析和热分析。结果表明,硼-硝酸钾的激光点火过程由激光烧蚀、热化学反应和自持燃烧等阶段构成;随着硼质量分数从30%增加到70%,50%发火的激光点火阈值存在一个最小值,分别为7.6 mJ(m(B):m(KNO_3):50:50)和4.05 mJ(m(B):m(KNO_3):m(酚醛树脂):40:50:5);激光点火延迟时间与激光点火能量密度的关系近似为线性递减关系,并且具有较低激光点火能量阈值的配比也具有较短的激光点火延迟时间;酚醛树脂将B-KNO_3的化学反应起始温度从556℃降低到548℃,化学反应放热量从1.86 kJ/g增大到2.21 kJ/g,提高了激光点火感度和缩短了点火延迟时间。
Boron-potassium nitrate is an important energetic material with an oxygen / fuel ratio that is closely related to the ignition and combustion properties of the agent. In order to grasp the relationship between oxygen / fuel ratio and laser ignition performance, experimental studies on laser ignition characteristics, thermodynamic parameters and thermal analysis of different ratios of boron-potassium nitrate and its phenolic resin dopants were carried out. The results show that the laser ignition process of boron-potassium nitrate consists of laser ablation, thermochemical reaction and self-sustaining combustion. With the increase of boron content from 30% to 70%, there is a minimum of 50% ignition laser ignition threshold (KNO3): 50:50 and 4.05 mJ (m (B): m (KNO3): m (phenolic): 40:50:5, respectively); laser ignition delay The relationship between time and laser ignition energy density is approximately linear decreasing relationship, and the ratio of laser ignition energy threshold with lower laser ignition delay time also has a shorter laser ignition delay time. Phenolic resin changes the chemical reaction initiation temperature of B-KNO 3 from 556 ℃ Decreased to 548 ℃, and the heat of chemical reaction increased from 1.86 kJ / g to 2.21 kJ / g, which improved the ignition sensitivity of laser and shortened the ignition delay time.