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Coupled Fluid-Structure Interaction Analysis of Solid Rocket Motor with Flexible Inhibitors

机译：带有柔性抑制剂的固体火箭发动机的流固耦合分析

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摘要

Flexible inhibitors are used in solid rocket motors to control the burning of a propellant, and vortices generated by propellant flow around the inhibitors have been identified as a driving source of instabilities that can lead to thrust oscillations in launch vehicles. Potential coupling between the thrust oscillations and structural vibration modes is an important risk factor in launch vehicle design. To better understand these phenomena, a fluid-structure interaction simulation capability has been developed, and this paper describes its application to investigate multidisciplinary phenomena of flexible inhibitors inside solid rocket motors. The features of the fluid and structural solvers, along with the multidisciplinary coupling methodology, are presented in a general Eulerian-Lagrangian framework. The fluid domain is discretized using general polyhedral unstructured meshes, and full three-dimensional shell elements are used in the structural domain for the inhibitors. Verifications for the structural model show excellent agreement with analytical solutions, and coupled results show that, because of acoustic coupling, the dynamics of one of the most flexible inhibitors shift from its first modal frequency to the first acoustic frequency of the solid rocket motor. This demonstrates that the capability can provide valuable insights into how the dynamics of the inhibitor can affect the flowfield, which can influence solid rocket motor design.
机译：挠性抑制剂用于固体火箭发动机中以控制推进剂的燃烧，由推进剂在抑制剂周围流动产生的涡流已被确定为不稳定的驱动源，可导致运载火箭的推力振荡。推力振荡和结构振动模式之间的潜在耦合是运载火箭设计中的重要风险因素。为了更好地理解这些现象，已经开发了流固耦合仿真功能，本文介绍了其在研究固体火箭发动机内部柔性抑制剂的多学科现象中的应用。流体和结构求解器的功能，以及多学科的耦合方法，在一般的欧拉-拉格朗日框架中进行了介绍。使用通用的多面体非结构化网格离散化流体域，并且在结构域中使用完整的三维壳单元作为抑制剂。对结构模型的验证表明，该模型与解析解具有极好的一致性，耦合结果表明，由于声学耦合，一种最灵活的抑制器的动力学特性从固体火箭发动机的第一模态频率转换为第一模态频率。这表明该功能可以为抑制剂的动力学如何影响流场提供宝贵的见解，而后者可以影响固体火箭发动机的设计。

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  • 来源
    《Journal of Spacecraft and Rockets》 |2018年第2期|303-314|共12页
  • 作者

    Yang H. Q.; West Jeff; Harris Robert E.;

  • 作者单位

    CFD Res Corp, CFDRC Jacob ESSSA Grp, 701 McMillian Way, Huntsville, AL 35806 USA;

    NASA, Marshall Space Flight Ctr, Fluid Dynam Branch, ER42, Huntsville, AL 35812 USA;

    CFD Res Corp, 701 McMillianWay, Huntsville, AL 35806 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
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