Abstract: The critical available burning rate curve (Pr curve) was defined to be the boundary of range of adjustable and nonadjustable lowest burning rate. The variation trend of Pr curve of 1962N·s/kg DB propellant,30%,50%RDX-CMDB propellant,5%Al-CMDB propellant and SYQu (a kind of low burning rate propellant) was analyzed. The results show that Pr curve moves to the range of high burning rate with the increasing content of NC and NG; Pr curve is raised by adding Al; as the content of RDX in propellant increases, Pr curve is abased first and then raised; Pr curve is abased when the speed reducing agent, such as POM, is added. 

Key words: DB propellant；Pr curves

摘要： 根据正催化理论,提出了压力-燃速临界使用曲线(Pr线)的概念及定义,并以之作为燃速可调与不可调的分界线。通过分析1962N·s/kg双基推进剂,30%,50%RDX-CMDB,5%Al-CMDB和低燃速SYQu推进剂的特征Pr线变化趋势,研究了Pr线调节规律。结果表明:Pr线主要由NC和NG组成的粘合剂体系控制,且随双基组分的增加,Pr线向高燃速移动；加入Al粉Pr线升高；随着RDX增加,Pr线先降低再升高；加入降速剂聚甲醛等,Pr线降低。

关键词: 双基推进剂;Pr线