Abstract This work shows basic features of pebble flow in HTR-PM via DEM simulation, in accompany with pebbled beds of varied base angles, friction coefficients and recirculation modes. The effects of base angles, friction coefficients and recirculation modes on the characteristics of pebble flows are explored. Beside phenomenological observation by pebble stripes, the three-dimensional pebble spindles and pebble streamlines defined in the Lagrangian and Eulerian framework respectively are all computed and analyzed quantitatively to give full description of pebble flows. The probability density function of horizontal distribution is computed to quantify pebble diffusion in the pebble spindle. The pebble streamlines are also fitted with modeling functions well to give useful indications for reactor design, and the fitting coefficients under various conditions are provided. The simulation results will be useful for better understanding and predictions of the real pebble beds, as well as their influencing factors.

中文翻译：

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基于 HTR-PM 的 3D 卵石流模拟对底角、再循环模式和摩擦系数的影响

摘要 本工作通过 DEM 模拟显示了 HTR-PM 中卵石流的基本特征，伴随着不同底角、摩擦系数和再循环模式的卵石床。探讨了底角、摩擦系数和再循环模式对卵石流特征的影响。除了卵石条纹的现象学观察，拉格朗日框架和欧拉框架中分别定义的三维卵石纺锤体和卵石流线都进行了定量计算和分析，以充分描述卵石流动。计算水平分布的概率密度函数以量化卵石纺锤体中的卵石扩散。卵石流线还很好地配备了建模功能，可为反应器设计提供有用的指示，并提供了各种条件下的拟合系数。模拟结果将有助于更好地理解和预测真实的卵石层及其影响因素。