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PARTICLE SIZE EFFECTS ON CL20/GAP COMBUSTION: EXPERIMENTS AND THEORY

机译:CL20 / GAP燃烧的颗粒尺寸效应:实验和理论

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摘要

The present study deals with combustion characteristics of CL20/GAP propellants and particularly focuses on the influence of particle size on ballistics behavior. Combustion of CL20/GAP mixtures, with different CL20 particle sizes (5 to 300 μm), is experimentally studied by measuring burning rate via ultrasonic techniques. Experimental data obtained attest some significant size effects and distinctly show two regimes depending on particle size. For coarse particles, a high burning rate, high exponent mode is observed while with fine particles, a regime with lower burning rate and exponent is noticed. A comprehensive theoretical approach is used based on the sequential burning model. This model allows for a good prediction of propellant burning rate for coarse CL20. However, it fails for fine particle regime and overestimates pressure exponent, which hints that a non-sequential burning may occur. A possible scenario, relying on possibly enhanced particle/binder heat transfer that involves CL20 burning rate decrease, is then proposed: CL20 particles are actually thought to leave the surface virtually unreacted and burn only in gas phase. Development of an associated theoretical frame seems to confirm the proposed explanation and allows for a good prediction of the non-sequential regime.
机译:本研究涉及CL20 / GAP推进剂的燃烧特性,尤其关注粒径对弹道行为的影响。通过使用超声波技术测量燃烧速率,对具有不同CL20粒径(5至300μm)的CL20 / GAP混合物的燃烧进行了实验研究。获得的实验数据证明了一些显着的尺寸效果,并清楚地显示了两种取决于颗粒尺寸的方案。对于粗颗粒,观察到高燃烧速率,高指数模式,而对于细颗粒,则观察到燃烧速率和指数较低的状态。基于顺序燃烧模型,使用了一种综合的理论方法。该模型可以很好地预测粗CL20的推进剂燃烧速率。但是,它不能用于细颗粒状态,并且会高估压力指数,这暗示可能会发生非顺序燃烧。然后提出了一种可能的方案,该方案依赖于可能导致CL20燃烧速率降低的增强的颗粒/粘合剂传热:实际上认为CL20颗粒实际上未反应离开表面,仅在气相中燃烧。相关理论框架的发展似乎可以证实所提出的解释,并可以很好地预测非顺序体制。

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