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The effect of pressure and oxygen concentration on the ignition and combustion of aluminum-magnesium fuel-rich propellant

机译：压力和氧气浓度对富铝镁燃料推进剂着火和燃烧的影响

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摘要

In order to better understand how future candidate solid propellants may affect combustion characteristics in ramjet motor, the aluminum-magnesium fuel-rich propellant was tested on a sealed high-pressure laser ignition platform. The laser ignition experimental device was designed and built, then the ignition and combustion characteristics of aluminum-magnesium fuel-rich propellant under different pressures and oxygen concentrations in environment gas were studied. The comprehensive impacts of pressure and oxygen concentration on ignition delay time and burning rate were appraised. The results displayed that the ignition delay time was decreased with the increase of pressure and oxygen concentration. The effect of pressure on ignition delay time was weaker than oxygen concentration. The impact of oxygen concentration on ignition was very complex. When the oxygen concentration of environment gas was less than that of the oxidizing gas from the propellant pyrolysis products, the ignition gas phase reaction occurred in the dispersion region of the solid propellant pyrolysis product, the initial flame was close to the propellant surface. In contrast, when the oxygen concentration was larger than the pyrolysis oxidizing gas, the ignition gas phase reaction occurred in the diffusion zone of the propellant pyrolysis products and the environment gas, the initial flame appeared far from the propellant surface. The burning rate of aluminum-magnesium fuel-rich propellant increased with the increase of pressure and oxygen concentration, where their effect on burning rate is accord with B-number theory. Comparing the experimental measurements with an analytical model, the results showed good consistency. The function of oxygen concentration and pressure could explain the effect on burning rate and ignition delay time, because pressure and oxygen concentration were favorable for the heat transfer, radiation and convection from the flame. The function of the combined influences of pressure and oxygen concentration on burning rate was established by a power law fitting. The good fitting is consistent with the experimental measurements, and shows that the scaling is valid for a full range of pressure and oxygen concentration tests to predict burning rate. (C) 2018 Elsevier Masson SAS. All rights reserved.
机译：为了更好地理解将来的候选固体推进剂可能如何影响冲压喷气发动机的燃烧特性，在密封的高压激光点火平台上对富含铝镁燃料的推进剂进行了测试。设计并建立了激光点火实验装置，研究了铝镁富燃料推进剂在不同压力和环境气体中氧浓度下的点火和燃烧特性。评价了压力和氧​​气浓度对点火延迟时间和燃烧速率的综合影响。结果表明，点火延迟时间随着压力和氧气浓度的增加而减小。压力对点火延迟时间的影响弱于氧气浓度。氧气浓度对点火的影响非常复杂。当环境气体的氧气浓度小于来自推进剂热解产物的氧化气体的氧气浓度时，点火气相反应发生在固体推进剂热解产物的分散区域中，初始火焰接近推进剂表面。相反，当氧浓度大于热解氧化气体时，在推进剂热解产物和环境气体的扩散区域中发生点火气相反应，初始火焰出现在远离推进剂表面的地方。富铝镁燃料推进剂的燃烧速率随着压力和氧气浓度的增加而增加，其对燃烧速率的影响符合B数理论。将实验测量值与分析模型进行比较，结果显示出良好的一致性。氧气浓度和压力的函数可以解释对燃烧速率和点火延迟时间的影响，因为压力和氧气浓度有利于火焰的传热，辐射和对流。通过幂定律拟合建立了压力和氧​​气浓度对燃烧速率的综合影响功能。良好的拟合度与实验测量结果一致，并且表明该缩放比例对于整个范围的压力和氧气浓度测试有效，以预测燃烧速率。 （C）2018 Elsevier Masson SAS。版权所有。

著录项

  • 来源
    《Aerospace science and technology》 |2018年第5期|394-401|共8页
  • 作者

    Li Lian-bo; Chen Xiong; Musa Omer; Zhou Chang-sheng; Zhu Min;

  • 作者单位

    Nanjing Univ Sci & Technol, Sch Mech Engn, Nanjing 210094, Jiangsu, Peoples R China;

    Nanjing Univ Sci & Technol, Sch Mech Engn, Nanjing 210094, Jiangsu, Peoples R China;

    Nanjing Univ Sci & Technol, Sch Mech Engn, Nanjing 210094, Jiangsu, Peoples R China;

    Nanjing Univ Sci & Technol, Sch Mech Engn, Nanjing 210094, Jiangsu, Peoples R China;

    Nanjing Univ Sci & Technol, Sch Mech Engn, Nanjing 210094, Jiangsu, 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

    Fuel-rich propellant; Ignition delay time; Solid fuel ramjet; Burning rate;

    机译：富燃料推进剂;点火延迟时间;固体冲压燃料;燃烧率;

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