论文部分内容阅读
基于临界起爆判据Pnτ=K,通过对高压水射流出口压力的合理选择,研究HTPB推进剂发生冲蚀破碎过程中的安全性。依据水射流的冲击理论和推进剂的力学特性,得出最低出口压力,并讨论其对推进剂冲击安全性的影响。建立以水锤压力为危险源的飞片冲击模型,以临界起爆压力衡量水锤压力在SDT过程中的安全性。结果表明,在任何出口压力下,水锤压力对于SDT过程中的安全性无影响;而当出口压力达到100MPa时,在滞止压力作用下的温升变化异常,推进剂内部温度已接近临界温度,具有较大的危险性。通过评判两个阶段对HTPB推进剂的冲击安全性,确定出口压力的安全区间为60～100MPa。
Based on the critical initiation criterion Pnτ = K, the safety of HTPB propellant during the process of erosion and crushing was studied through the reasonable choice of outlet pressure of high pressure water jet. Based on the impact theory of water jet and the mechanical properties of propellants, the minimum outlet pressure is obtained and the impact on propellant impact safety is discussed. The impact model of water-hammer pressure was established and the safety of water hammer pressure during SDT was measured by critical explosion pressure. The results show that the water hammer pressure has no effect on the safety of SDT at any outlet pressure. When the outlet pressure reaches 100 MPa, the temperature rise under the stagnation pressure changes abnormally and the internal temperature of the propellant is close to the critical temperature , With greater risk. By judging the impact safety of HTPB propellants in two stages, the safe range of outlet pressure is determined to be 60 ~ 100MPa.