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首页> 外文期刊>International Journal of Heat and Mass Transfer >3D pore-scale simulations and 1D volume-averaged calculations of the flow and thermal non-equilibrium for low-velocity filtration combustion
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3D pore-scale simulations and 1D volume-averaged calculations of the flow and thermal non-equilibrium for low-velocity filtration combustion

机译：用于低速过滤燃烧的流量和热非平衡的3D孔径模拟和1D体积平均计算

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摘要

3D pore-scale simulations of the flow and thermal non-equilibrium for low-velocity filtration combustion are numerically performed in randomly packed bed of 2282 pellets with a diameter of 5.6 mm. A 1D volume-averaged simulation is also conducted for comparison. The root-mean-square (RMS) of variables is used to quantitatively study the non-equilibrium characteristics. Results show that the 1D model un-derpredicts the flame thickness. Predictions by the 3D pore-scale model show that the flow and thermal non-equilibrium exist in the entirely packed bed for all the conditions investigated, but the extent of flow and thermal non-equilibrium in the packed bed varies with time and operating condition. An estimation expression for the root mean of the average gas temperature is proposed using the mixture gradient and the ratio between the average axial velocity and its value of RMS. With increasing mixture inlet velocity, the extent of the flow and thermal non-equilibrium increases, demonstrating that the spatially inhomo-geneous variation of the mixture velocity and gas temperature in the packed bed is accelerated with mixture velocity at the inlet. It is observed that the computational time of the 3D pore-scale model is higher by a factor of 225 compared with the ID volume-averaged model.
机译：用于低速过滤燃烧的流动和热非平衡的3D孔径模拟在2282个颗粒的随机包装床上进行数值进行，直径为5.6mm。还进行了1D体积平均仿真以进行比较。变量的根平均方形（RMS）用于定量地研究非平衡特性。结果表明，1D模型UN-DERPREDICTS火焰厚度。 3D孔径模型的预测表明，对于所有调查的条件，完全填充的床中存在流动和热非平衡，但填充床中的流动程度和热非平衡程度随时间和操作条件而变化。使用混合梯度和平均轴向速度与其RMS值之间的比率提出了平均气体温度的根均值的估计表达。随着混合物入口速度的增加，流动和热非平衡的程度增加，表明填充床中混合速度和气体温度的空间偏离族族变化在入口处的混合速度加速。与ID体积平均模型相比，3D孔径模型的计算时间较高了225倍。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2021年第10期|121532.1-121532.13|共13页
  • 作者

    Junrui Shi; Jinsheng Lv; Frank Behrendt; Yongqi Liu; Mingming Mao; Fang He;

  • 作者单位

    School of Transportation and Vehicle Engineering Shandong University of Technology Zibo Shandong 255049 China;

    School of Transportation and Vehicle Engineering Shandong University of Technology Zibo Shandong 255049 China;

    School of Transportation and Vehicle Engineering Shandong University of Technology Zibo Shandong 255049 China Technische Universitaet Berlin Berlin 10623 Germany;

    School of Transportation and Vehicle Engineering Shandong University of Technology Zibo Shandong 255049 China;

    School of Transportation and Vehicle Engineering Shandong University of Technology Zibo Shandong 255049 China;

    School of Transportation and Vehicle Engineering Shandong University of Technology Zibo Shandong 255049 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

    Pore-scale simulation; Thermal non-equilibrium; Flow non-equilibrium; Filtration combustion;

    机译：孔径模拟;热不平衡;流量非平衡;过滤燃烧;

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