摘要
理论计算了HTPE钝感推进剂(PET/AP/Al质量比为18∶64∶18)的质量比冲、特征速度和绝热燃烧温度,测试了推进剂的爆热和密度,依据GJB772A-97 601.2方法和GJB772A-97 602.1方法,测定了推进剂的机械感度,并与HTPB推进剂进行了比较,评估了HTPE钝感推进剂的子弹撞击和快速烤燃特性。结果表明,HTPE推进剂在6.86MPa下的理论比冲为268.0s,实测爆热为7456J/g,实测密度为1.812g/cm~3,均大于HTPB推进剂;HTPE推进剂在低压下(1MPa)可稳定燃烧,并且具有较低的燃速压强指数,在1～18MPa下n≤0.42;推进剂具有较低的外界刺激感度,其中摩擦感度为0,撞击感度(特性落高H_(50))大于77cm,12.7cm子弹撞击试验和快速烤燃试验均表现为燃烧反应,具有较低的易损特性。
The theoretical specific impulse, characteristic velocity and combustion temperature of HTPE insensitive solid propellant(mass ratio of PET∶AP∶Al is 18∶64∶18) were calculated and designed by means of minimum free energy principle, the heat of explosion and density of propellants were detected, and the mechanical sensitivity(impact sensitivity and friction sensitivity) were evaluated according to GJB772 A-97 601.2 and GJB772 A-97 602.1, and were compared with those of HTPB propellant. The bullet impact and fast cook-off properties of HTPE propellant were evaluated. The theoretical impulse of HTPE propellant under 6.86 MPa is 268.0 s, calculated heat of detonation is 7465 J/g, and density is 1.812 g/cm~3, which are all higher than those of HTPB propellant. The results show that HTPE propellant can steadily burned under low pressure(1 MPa), its pressure exponent is less than 0.42 at the pressure range from 1 MPa to 18 MPa. HTPE propellant has low sensitivity under the stimuli, its friction sensitivity and impact sensitivity are 0 and higher than 77 cm, respectively, the 12.7 mm bullet impact and fast cook-off tests of HTPE propellant show combustion reaction and low vulnerability.
引文
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