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Aluminized composite propellant combustion modeling with Heterogeneous Quasi-One dimensional (HeQul-D) approach

机译：均质准一维（HeQul-D）方法的铝化复合推进剂燃烧模拟

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摘要

The Heterogeneous Quasi One-dimensional (HeQu1-D) model for AP/HTPB composite propellant combustion is extended to aluminized propellants. Following the serial burning approach of HeQu1-D, a statistical particle path through an aluminized propellant is taken to consist of aluminized binder-matrix coated AP particles of various sizes. Extending the idea of homogenization of fine-AP particles, aluminum particles are assumed to be homogenized with the binder-matrix. Large Al particles (nominal size = 15 mu m) in the binder-matrix are assumed to get ejected into the gas phase and hence do not contribute to heat feedback to the burning surface. With these modifications, the model is shown to accurately predict the burn rate variation with pressure and initial temperature of propellants using Al of nominal sizes in the range of 15-50 mu m (termed conventional aluminum, CAl). The experimentally observed reduction in propellant burn rate with substitution of AP by CAl is shown to be due to the increase in fuel richness and energy sink effect of melting of Al. Catalytic effects due to addition of burn rate modifiers (Fe2O3 in space shuttle booster propellant, for instance) are also accounted for by modifications to gas phase rate parameters. Increase in burn rate up to 25% with Al particles of a few pm (3-6 mu m) in comparison with non-aluminized propellant is explained by recognizing that there will be non-negligible fraction of sub-micron Al due to the associated particle size distribution. This leads to heat release by sub-micron Al combustion close to the surface and an enhancement in the heat feedback, by a combination of convective and radiative mechanisms. Dramatic increase in burn rate with sub-micron Al (a factor of 4-5 as compared to CAl) is captured by invoking radiation from fine-Al/Al2O3 particles to propellant surface. Agglomeration of sub micron Al particles is invoked to explain the saturation of burn rate enhancement with reduction in Al particle size and the effectiveness of sub-micron Al substitution in smaller fractions (bi-modal Al). Predictions for over fifteen different propellants with varying fractions of fine and coarse aluminum from earlier literature have been presented. Comparisons of the predictions from the model with experimental results from different sources is shown to be excellent-to-good for most cases. The hitherto unknown radiation dominated ablation (r(over dot) 50 mm/s) of coarse AP particles and the effect of Al particle size on propellant temperature sensitivity are brought out. The MATLAB (R) code based on the model offers opportunity for design of AP-HTPB composite propellants with combination of fine and coarse aluminum with confidence. (C) 2018 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
机译：AP / HTPB复合推进剂燃烧的非均质准一维（HeQu1-D）模型扩展到铝化推进剂。遵循HeQu1-D的系列燃烧方法，通过铝化推进剂的统计粒子路径被认为是由各种尺寸的铝化粘合剂基体涂覆的AP粒子组成的。扩展了细AP颗粒的均质化概念，铝颗粒被假定与粘合剂基体均质化。假设粘合剂基体中的大Al颗粒（标称尺寸> = 15μm）会喷射到气相中，因此不会有助于热量反馈到燃烧表面。进行了这些修改后，该模型显示使用公称尺寸为15-50μm的Al（称为常规铝，CA1）可以准确地预测燃烧速率随推进剂压力和初始温度的变化。在实验中观察到的推进剂燃烧速率降低（由AP代替AP的铝）表明，这是由于燃料富集度的增加和Al熔化的能量吸收效应所致。由于添加了燃烧速率调节剂（例如，航天飞机助推剂中的Fe2O3），还可以通过对气相速率参数进行修改来达到催化效果。与未铝化的推进剂相比，铝颗粒数微米（3-6微米）时，燃烧率提高高达25％，这是因为认识到由于与铝的结合，亚微米级铝的含量不可忽略粒度分布。这通过对流和辐射机制的结合，通过靠近表面的亚微米Al燃烧而释放出热量，并增强了热反馈。通过将辐射从细Al / Al2O3颗粒发射到推进剂表面，可以捕获亚微米Al（与CAl相比为4-5倍）燃烧速率的显着提高。调用亚微米Al颗粒的团聚来解释燃烧速率随Al颗粒尺寸减小而增加的饱和度，以及在较小的分数（双峰Al）中亚微米Al替代的有效性。已经提出了根据较早文献对十五种不同推进剂的预测，这些推进剂具有不同比例的细铝和粗铝。在大多数情况下，将模型的预测结果与不同来源的实验结果进行比较，是极好的。提出了迄今未知的粗AP颗粒的辐射主导型烧蚀（r（超过点）> 50 mm / s），以及Al颗粒尺寸对推进剂温度敏感性的影响。基于该模型的MATLAB（R）代码为使用细铝和粗铝的组合充满信心地设计AP-HTPB复合推进剂提供了机会。 （C）2018年燃烧研究所。由Elsevier Inc.出版。保留所有权利。

著录项

  • 来源
    《Combustion and Flame》 |2018年第6期|59-70|共12页
  • 作者

    Varunkumar S.; Mukunda H. S.;

  • 作者单位

    Indian Inst Technol, Dept Mech Engn, Madras 600036, Tamil Nadu, India;

    Indian Inst Sci, Dept Aerosp Engn, CGPL, Bangalore 560012, Karnataka, India;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Aluminum; Catalyst; Composite propellants; Radiation; Modeling;

    机译：铝;催化剂;复合推进剂;辐射;造型;

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