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首页> 外文期刊>Combustion and Flame >Unsteady Flow Evolution and Combustion Dynamics of Homogeneous Solid Propellant in a Rocket Motor
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Unsteady Flow Evolution and Combustion Dynamics of Homogeneous Solid Propellant in a Rocket Motor

机译：火箭发动机均质固体推进剂的非定常流动演化和燃烧动力学

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摘要

A time-resolved numerical analysis of combustion dynamics of double-base homogenous solid propellant in a rocket motor is performed by means of a Large-Eddy Simulation (LES) technique. The physiochemical processes occurring in the flame zone and their influence on the unsteady flow evolution in the chamber are investigated in depth. A five-step reduced reaction mechanism is used to obtain the two-stage flame structure consisting of a primary flame, a dark zone, and a secondary flame in the gas phase. It is observed that, for homogeneous solid propellant combustion, the chemical time scale is much greater than the smallest turbulence time scale, rendering a highly stretched and thickened flame. The chemical reactions proceed at a slower rate than turbulent mixing, and propellant combustion may be locally treated as a well-stirred reactor. The flowfleld in the chamber consists of three regions of evolution: the upstream laminar regime, the central transitional section, and the fully developed turbulent regime further downstream. A theoretical formulation exploring the chamber flow and flame dynamics is established to study the intriguing phenomenon of combustion instability. The work done by Reynolds stresses, vorticity-flame interactions, and coupling between the velocity field and entropy fluctuations may cause resonance effects and excite pressure oscillations leading to self-sustained unsteady motions within the chamber.
机译：利用大涡模拟（LES）技术对火箭发动机中双基均质固体推进剂的燃烧动力学进行了时间分辨数值分析。深入研究了火焰区域中发生的物理化学过程及其对室内不稳定流动演变的影响。使用五步还原反应机理来获得由气相中的一次火焰，暗区和二次火焰组成的两阶段火焰结构。可以看出，对于均匀的固体推进剂燃烧，化学时间尺度比最小湍流时间尺度大得多，从而产生了高度拉伸和增厚的火焰。化学反应的进行速度比湍流混合的速度慢，推进剂燃烧可被局部视为搅拌良好的反应堆。腔室中的流动场由三个演化区域组成：上游层流状态，中央过渡部分以及下游更充分的湍流状态。建立了研究燃烧室流动和火焰动力学的理论公式，以研究有趣的燃烧不稳定性现象。雷诺应力，涡旋-火焰相互作用以及速度场与熵波动之间的耦合可能导致共振效应和激发压力振荡，从而导致腔室内的自持不稳定运动。

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  • 来源
    《Combustion and Flame》 |2002年第2期|p.110-131|共22页
  • 作者

    SOURABH APTE; VIGOR YANG;

  • 作者单位

    Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, PA 16802, USA;

  • 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 燃料与燃烧;
  • 关键词

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