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Gas phase flame structure of solid propellant sandwiches with different reaction mechanisms

机译：反应机理不同的固体推进剂夹心气相火焰结构

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The gas phase flame structure of composite solid propellant sandwiches with two ammonium perchlorate (AP) laminae sandwiching a middle lamina containing a homogenized mixture of hydroxyl terminated poly butadiene (HTPB) binder and fine AP particles is numerically simulated. Experimentally obtained surface profiles and burning rates are used to decouple the gas phase from the condensed phase. In the literature, three global gas phase reactions for (1) the AP mono-propellant flame, (2) the primary diffusion flame, and (3) the final diffusion flame between gaseous products of AP decomposition/deflagration and the binder have been considered. Alternatively, multi-step detailed/reduced reaction mechanisms have been adopted to represent all these flames together. In the present study, three different reaction mechanisms are evaluated: (1) global chemistry using symbolic species for the three flames, (2) global chemistry using a 12-species mechanism for the above three flames, and (3) a 72-step reaction mechanism with 39-species representing all the flames. The 12-species, 3-step global reaction mechanism provides a temperature field similar to the 72 step mechanism unlike the global reaction mechanism involving symbolic species. Further, the triple flame structure of the primary diffusion flame and the 'canopy' premixed flame over the middle lamina (for a self-deflagrating mixture of fine AP and binder) are well captured by the 12-species mechanism unlike the other two considered. (C) 2015 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
机译：数值模拟了复合固体推进剂三明治的气相火焰结构，其中两块高氯酸铵（AP）薄片夹着中间薄片，中间薄片包含羟基封端的聚丁二烯（HTPB）粘合剂和细小的AP颗粒的均质混合物。实验获得的表面轮廓和燃烧速率用于使气相与冷凝相分离。在文献中，考虑了以下三个全局气相反应：（1）AP单推进剂火焰，（2）一次扩散火焰和（3）AP分解/爆燃气态产物与粘合剂之间的最终扩散火焰。 。或者，已采用多步详细/减少的反应机理将所有这些火焰一起表示。在本研究中，对三种不同的反应机理进行了评估：（1）对三种火焰使用符号物质进行整体化学处理；（2）对以上三种火焰使用12种机理进行整体化学处理；（3）72步39种代表所有火焰的反应机理。与涉及符号物种的全局反应机制不同，该12种3步全局反应机制可提供与72步机制相似的温度场。此外，与其他两种考虑的机制不同，通过12种机理可以很好地捕获初级扩散火焰和中间薄层上的“冠层”预混火焰（用于细小AP和粘合剂的自爆混合物）的三重火焰结构。 （C）2015年燃烧研究所。由Elsevier Inc.出版。保留所有权利。

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