二硝酰胺铵对交联改性双基推进剂能量及燃烧性能的影响

Effects of Ammonium Dinitramide on Energy and Combustion Performance of Cross-Linked Modified Double Base Propellant

为研究二硝酰胺铵(ADN)对交联改性双基推进剂(XLDB)推进剂能量及燃烧性能的影响规律,采用扫描电镜观察了ADN颗粒的微观形貌,采用最小自由能法分别计算了ADN逐步代替奥克托今(HMX)和高氯酸铵(AP)对XLDB推进剂能量参数的影响,并通过靶线法和稳态燃烧火焰结构研究了不同ADN含量推进剂的燃烧性能。结果表明,ADN颗粒表面光滑、致密,无明显缺陷; ADN完全替代HMX时,推进剂理论比冲降低10. 3 N·s/kg; ADN完全替代AP时,理论比冲提高38. 4 N·s/kg;采用ADN逐步替代AP时,推进剂1～15 MPa下燃速和压力指数增加。

In order to research the effects of ammonium dinitramide(ADN)on energy and combustion of cross-linked modified double base(XLDB)propellant,scanning electron microscopy(SEM)was used to observe the microstructure of ADN.The energy characteristic parameters were calculated based on the minimum free energy method.The burning performances of propellant with different ADN content were tested by target line method and steady state combustion flame structure.The results show that the surface of ADN particles is compact,smooth,and no obvious defects.The theory specific impulse of propellant was reduced by 10.3 N·s/kg when cyclotetramethylenetetranitroamine(HMX)was replaced by ADN.The theory specific impulse of propellant was increased by 38.4 N·s/kg when ammonium perchlorate(AP)was replaced by ADN.The burning rate and pressure exponent were increased under 1~15 MPa with AP was replaced by ADN gradually.