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Experimental and theoretical analysis of carbon driven detonation waves in a heterogeneously premixed Rotating Detonation Engine

机译：异均匀预混旋转爆轰发动机中碳驱动爆轰波的实验与理论分析

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摘要

Coal dust explosions can be hazardous; however, they can also generate a significant rise in stagnation pressure if adequately harnessed. Rotating detonation combustors seek to take advantage of the stagnation pressure rise phenomenon in a more sustained and controlled manner via confinement to a physical annulus, leading to increased overall thermodynamic efficiency. This investigation presents an analysis of detonations fueled by Carbon Black, a solid particulate consisting of virtually pure carbon molecules and lean Hydrogen-Air mixtures. It is realized that with the addition of Carbon Black, an increase of lean mixture detonability and detonation velocities extending the operating limit over that of a pure hydrogen-air mixture is experienced. For all testing conditions, the total equivalence ratio is held at phi = 1, while the fuel mixture's carbon mass fraction is increased from 0 to 0.7 while the hydrogen is decreased. Detonation wave velocities are extracted from high-speed imaging through applying a Discrete Fourier Transform algorithm to determine changes to the wave speed as Carbon Black particles are introduced. As a result, due to the addition of Carbon Black as an auxiliary fuel source, detonations were formed instead of deflagrations in operating conditions where one would expect deflagrations at the same hydrogen-air equivalence ratios without Carbon Black addition. The detonation formation provides evidence that the coal particles are reacting within the detonation wave in a large enough capacity to support a detonation wave within the annulus. Furthermore, the wave speed is shown to increase with the additional of carbon particles. At a constant global equivalence ratio, the detonation wave velocities were found to decrease with hydrogen's incremental replacement with coal particles. Whereby, through a theoretical comparison of the heat of combustion as computed from the experimentally derived detonation wave velocities, a linear relationship of the two was shown to exist. Therefore, the heat of combustion has the potential to describe an operational limit to sustaining a detonation wave.
机译：煤尘爆炸可能是危险的;然而，如果充分利用，它们也可以产生显着的滞留压力的升高。旋转爆轰燃烧器寻求通过限制以更持续和控制的方式利用滞留压力升高现象，从而提高总热力学效率。该研究介绍了由炭黑推动的爆炸的分析，由几乎纯碳分子和贫氢气混合物组成的固体颗粒。通过添加炭黑的添加，倾斜混合物的可抑制性和爆炸速度延长在纯氢气混合物的爆破性和爆炸速度的增加。对于所有测试条件，总等效比在PHI = 1处保持，而燃料混合物的碳质量级分在0至0.7时升高，而氢气降低。通过施加离散的傅里叶变换算法来从高速成像中提取爆炸波速度，以确定与炭黑颗粒的波速的变化。结果，由于添加炭黑作为辅助燃料源，在操作条件下形成爆炸而不是除垢，其中一个人将期望在相同的氢气量值比下没有炭黑的添加。爆轰形成提供了煤颗粒在爆炸波中以足够大的容量反应以支撑环内的爆炸波。此外，波速被显示为随着额外的碳颗粒而增加。以恒定的全局等效率，发现爆炸波速度随氢含量与煤颗粒的增量替代减少。由此，通过从实验衍生的爆轰波速计算的燃烧热的理论比较，示出了两者的线性关系。因此，燃烧热具有描述对维持爆炸波的操作限制。

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  • 来源
    《Fuel》 |2021年第15期|121128.1-121128.10|共10页
  • 作者

    Dunn Ian B.; Malik Vidhan; Flores Wilmer; Morales Anthony; Ahmed Kareem A.;

  • 作者单位

    Univ Cent Florida Prop & Energy Res Lab Dept Mech & Aerosp Engn Orlando FL 32816 USA;

    Univ Cent Florida Prop & Energy Res Lab Dept Mech & Aerosp Engn Orlando FL 32816 USA;

    Univ Cent Florida Prop & Energy Res Lab Dept Mech & Aerosp Engn Orlando FL 32816 USA;

    Univ Cent Florida Prop & Energy Res Lab Dept Mech & Aerosp Engn Orlando FL 32816 USA;

    Univ Cent Florida Prop & Energy Res Lab Dept Mech & Aerosp Engn Orlando FL 32816 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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