Rocket Propellant Comparison: Conventional Planetary Mixing and Resonant Acoustic Mixing,Propellants, Explosives, Pyrotechnics

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Rocket Propellant Comparison: Conventional Planetary Mixing and Resonant Acoustic Mixing
Propellants, Explosives, Pyrotechnics ( IF 1.7 ) Pub Date : 2021-05-14 , DOI: 10.1002/prep.202100028
Paul C. Smith ₁ , Joel P. Huf ₁ , Christopher A. Williams ₂

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A standard HTPB/AP/Al composite rocket propellant formulation was prepared with a conventional vertical planetary action mixer and resonant acoustic mixer (RAM). Ingredients and process conditions were standardised as much as possible to facilitate a direct comparison of the two process regimes. Cured propellant specimens were characterised for sensitiveness, ballistic properties and mechanical properties at 3 temperatures (−54 °C, 25 °C and 74 °C). No significant differences were noted for sensitiveness between the planetary and RAM mixes. A slightly lower burn rate at 1000 psi (6.89 MPa) was noted for the RAM mixes. Maximum stress results at 25 °C were similar but significant differences in maximum strain and modulus were recorded. Maximum strain for the 1 Pint, 2 Gallon and RAM were 7.4 %, 9.1 % and 17.6 %, respectively. Modulus results were 26.0 MPa, 19.3 MPa and 11.1 MPa, respectively. Similar improvements in strain capability for the RAM propellant were recorded at −54 °C and 74 °C, with increases of 66 % and 117 %, respectively. A greater strain capability results from stronger interfacial adhesion between the solid fill and the binder, which is in turn generally a result of improved wetting of solid particles. This result, therefore, indicates more thorough mixing in the case of the RAM process but this requires confirmation through a more direct examination of the underlying mechanism.

中文翻译：

火箭推进剂比较：常规行星混合和共振声混合

标准的 HTPB/AP/Al 复合火箭推进剂配方是用传统的垂直行星作用混合器和共振声混合器 (RAM) 制备的。成分和工艺条件尽可能标准化，以促进两种工艺方案的直接比较。固化的推进剂样品在 3 个温度（-54 °C、25 °C 和 74 °C）下的灵敏度、弹道性能和机械性能均被表征。行星和 RAM 混合物之间的敏感性没有显着差异。注意到 RAM 混合物在 1000 psi (6.89 MPa) 下的燃烧速率略低。25 °C 下的最大应力结果相似，但记录的最大应变和模量存在显着差异。1 品脱、2 加仑和 RAM 的最大应变分别为 7.4%、9.1% 和 17.6%。模数结果为 26。分别为 0 兆帕、19.3 兆帕和 11.1 兆帕。RAM 推进剂的应变能力在 -54 °C 和 74 °C 时也有类似的改进，分别增加了 66% 和 117%。更大的应变能力源于固体填料和粘合剂之间更强的界面粘附，这通常又是改进固体颗粒润湿的结果。因此，该结果表明 RAM 过程的混合更彻底，但这需要通过对底层机制的更直接检查来确认。这反过来通常是改善固体颗粒润湿的结果。因此，该结果表明 RAM 过程的混合更彻底，但这需要通过对底层机制的更直接检查来确认。这反过来通常是改善固体颗粒润湿的结果。因此，该结果表明 RAM 过程的混合更彻底，但这需要通过对底层机制的更直接检查来确认。

更新日期：2021-05-14

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