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首页> 外文会议>AIAA/ASME/SAE/ASEE joint propulsion conference exhibit >Cast Double Base: Propellant designed to meet internal ballistic requirements
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Cast Double Base: Propellant designed to meet internal ballistic requirements

机译：铸造双基：满足内部弹道要求的推进剂

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Cast Double Base (CDB) propellants were first developed in the 1960s and 70s. This propellant, unlike extruded double base propellants, can be cast into any shape. The motor grain can also be cast in several layers with different plateau burn rates to obtain an optimal boost-sustain characteristic. This ability to tailor the burn rate in conjuction with an higher maximum web fraction offsets the lower theoretical impulse when compared to cross liked double base (XLDB) and composite propellants. In addition CDB propellants are true minimum smoke propellant and the secondary combustion in the plume can be suppressed with flame suppressants thus minimizing the chance of early detection. Lockheed Martin's Hellfire (XLDB), MBDA's Brimstone (Cast Double Base), and Denel Dynamics' Mokopa (Composite) missiles are all air/ground launched tactical missiles of the same caliber and mass. Interestingly Brimstone out performs both the Mokopa and the Hellfire in terms of maximum range, reported as 12 km, with Mokopa at 10 km and unexpectedly Hellfire with the highest specific impulse propellant has the shortest range of 8 km. This is because a system that is velocity constrained requires a boost sustain motor that can boost the missile to the maximum velocity as quickly as possible and sustain this velocity as long as possible. In such a system the primary driver is not total impulse but rather the propellant burn rate flexibility. Star port grain designs that use area to obtain the required boost-sustain profile suffer from volumetric losses. High energy propellants such as XLDB have a limited usable burn rate range, limiting their use to all boost motors. This investigation considered the requirements of the internal ballistician rather than the pursuit of maximum impulse. It will be shown that flexibility in propellant burn rate is a far more important factor in the tactical missile environment when single stage motors are the only option.
机译：铸造双基（CDB）推进剂最早于1960年代和70年代开发。与挤出的双基推进剂不同，该推进剂可以铸成任何形状。也可以将电动机颗粒铸造成具有不同高原燃烧速率的几层，以获得最佳的助推-维持特性。与十字叉双基（XLDB）和复合推进剂相比，这种具有较高的最大纤网分数的结合燃烧速率的能力抵消了较低的理论冲量。另外，CDB推进剂是真正的最低限度的烟雾推进剂，并且可以通过火焰抑制剂抑制烟羽中的二次燃烧，从而最大程度地减少了早期发现的机会。洛克希德·马丁公司的地狱火（XLDB），MBDA的硫磺（铸双基地）和Denel Dynamics的Mokopa（复合）导弹都是相同口径和质量的空中/地面发射战术导弹。有趣的是，硫磺在最大射程方面表现出Mokopa和Hellfire均最大，据报道为12 km，Mokopa为10 km，出乎意料的是，具有最高比冲量推进剂的Hellfire最短射程为8 km。这是因为受速度限制的系统需要助推维持马达，该马达可以将导弹尽快提升到最大速度，并尽可能长地维持该速度。在这样的系统中，主要的推动力不是总的推动力，而是推进剂燃烧速率的灵活性。使用面积来获得所需的助推-维持轮廓的星形端口颗粒设计会遭受体积损失。 XLDB等高能推进剂的可用燃烧率范围有限，从而限制了它们在所有升压电动机中的使用。这项调查考虑的是内部弹道师的要求，而不是追求最大的冲动。结果表明，在战术导弹环境中，单级电动机是唯一的选择，推进剂燃烧速率的灵活性是一个更为重要的因素。

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