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Efficient solid rocket propulsion for access to space

机译：高效的固体火箭推进器，可进入太空

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摘要

Space launch activity is expected to grow in the next few years in order to follow the current trend of space exploitation for business purpose. Granting high specific thrust and volumetric specific impulse, and counting on decades of intense development, solid rocket propulsion is a good candidate for commercial access to space, even with common propellant formulations. Yet, some drawbacks such as low theoretical specific impulse, losses as well as safety issues, suggest more efficient propulsion systems, digging into the enhancement of consolidated techniques.rnFocusing the attention on delivered specific impulse, a consistent fraction of losses can be ascribed to the multiphase medium inside the nozzle which, in turn, is related to agglomeration; a reduction of agglomerate size is likely. The present paper proposes a model based on heterogeneity characterization capable of describing the agglomeration trend for a standard aluminized solid propellant formulation. Material microstructure is characterized through the use of two statistical descriptors (pair correlation function and near-contact particles) looking at the mean metal pocket size inside the bulk. Given the real formulation and density of a propellant, a packing code generates the material representative which is then statistically analyzed. Agglomerate predictions are successfully contrasted to experimental data at 5 bar for four different formulations.
机译：为了顺应当前出于商业目的进行太空开发的趋势，预计太空发射活动将在未来几年内增长。固体火箭推进器具有很高的比推力和体积比脉冲，并且经过数十年的迅速发展，即使使用普通的推进剂配方，也可以很好地用于商业进入太空。然而，一些缺点，例如理论上的特定冲量低，损失以及安全性问题，提示了更高效的推进系统，挖掘了综合技术的增强。rn由于对交付的特定冲量的关注，一定比例的损失可以归因于喷嘴内的多相介质又与团聚有关；可能会减小附聚物的尺寸。本文提出了一种基于异质性表征的模型，该模型能够描述标准渗铝固体推进剂配方的团聚趋势。通过使用两个统计描述符（对相关函数和近接触粒子）来查看材料内部的平均金属腔尺寸，从而表征材料的微观结构。给定推进剂的实际配方和密度，包装代码会生成代表物料的材料，然后对该材料进行统计分析。团聚体预测成功地与四种不同配方在5 bar下的实验数据进行了对比。

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  • 来源
    《Acta astronautica》 |2010年第12期|p.1563-1573|共11页
  • 作者

    Filippo Maggi; rnAlessio Bandera; rnLuciano Galfetti; Luigi T. De Luca; rnThomas L. Jackson;

  • 作者单位

    Politecnico di Milano, 34, via La Masa, 20156 Milan, Italy Space Propulsion Laboratory, Aerospace Engineering Department;

    rnPolitecnico di Milano, 34, via La Masa, 20156 Milan, Italy Space Propulsion Laboratory, Aerospace Engineering Department;

    rnPolitecnico di Milano, 34, via La Masa, 20156 Milan, Italy Space Propulsion Laboratory, Aerospace Engineering Department;

    rnPolitecnico di Milano, 34, via La Masa, 20156 Milan, Italy Space Propulsion Laboratory, Aerospace Engineering Department;

    rnUniversity of Illinois at Urbana-Champaign, CSE, 1304, W. Springfield Avenue, Urbana, 61801, USA;

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

    solid propulsion; agglomeration; heterogeneity; pair correlation; aluminum;

    机译：固体推进;凝聚;异质性对相关铝;

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