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Numerical investigation of thermoacoustic instability caused by small disturbance in a solid rocket motor

机译：固体火箭电机小扰动引起的热声不稳定性的数值研究

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摘要

The nonlinear instabilities caused by small disturbances in combustion chambers always trouble solid rocket motors (SRMs) in application. This paper performs numerical simulation of the evolution process from the small disturbance to the unsteady state, even the limit cycle oscillation in a SRM with sidewall-burning-grain. Based on the Large Eddy Simulation (LES) technology, the formulation takes into account the complete conservation equations of mass, momentum, energy, and species concentration, and accommodates finite rate chemical kinetics in the gas phase to obtain more details. The coupling mechanism between oscillators is analysed and the impacts of the small disturbances with various amplitudes and frequencies are discussed comprehensively. The discussion of the limit cycle evolutions with the small disturbance amplitudes variation, provides the insight into the phase locking effects, which have great effects on the SRM stabilities. The results also imply when the frequencies of the small disturbances are commensurate with the acoustic modal frequencies, the systems prone to evolve into limit cycle states. Finally, the forced disturbances are eliminated after the limit cycle states achieved to reveal the coupling mechanism systematically and completely. (C) 2021 Elsevier Masson SAS. All rights reserved.
机译：由燃烧室中小扰动引起的非线性稳定性总是在应用中始终消除固体火箭电动机（SRMS）。本文从对不稳定状态的小扰动进行了数值模拟，即使是SRM中的极限循环振荡，具有侧壁燃烧晶粒。基于大型涡流仿真（LES）技术，制定考虑了质量，动量，能量和物种浓度的完整保护方程，并在气相中容纳有限速率化学动力学，以获得更多细节。分析振荡器之间的耦合机制，并综合讨论了具有各种幅度和频率的小扰动的影响。对具有小扰动幅度变化的极限周期演进的讨论提供了对阶段锁定效果的洞察力，这对SRM稳定性具有很大的影响。结果还暗示当小扰动的频率与声学模态频率相称时，易于进化到极限循环状态。最后，在实现耦合机制系统和完全揭示耦合机制之后消除了强制扰动。 （c）2021 Elsevier Masson SAS。版权所有。

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  • 来源
    《Aerospace science and technology》 |2021年第6期|106678.1-106678.11|共11页
  • 作者

    Xu Guanyu; Liu Peijin; Ao Wen; Wang Zhuopu; Jin Bingning;

  • 作者单位

    Northwestern Polytech Univ Internal Flow & Thermal Struct Lab Sci & Technol Combust Xian 710072 Peoples R China;

    Northwestern Polytech Univ Internal Flow & Thermal Struct Lab Sci & Technol Combust Xian 710072 Peoples R China;

    Northwestern Polytech Univ Internal Flow & Thermal Struct Lab Sci & Technol Combust Xian 710072 Peoples R China;

    Northwestern Polytech Univ Internal Flow & Thermal Struct Lab Sci & Technol Combust Xian 710072 Peoples R China;

    Northwestern Polytech Univ Internal Flow & Thermal Struct Lab Sci & Technol Combust Xian 710072 Peoples R China;

  • 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

    Small disturbance; Limit cycle; AP/HTPB; Combustion instability; Solid rocket motor;

    机译：小扰动;极限循环;AP / HTPB;燃烧不稳定;固体火箭电机;

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