Abstract Vented dust explosions were simulated using the computational fluid dynamics code FLACS-DustEx. The results were compared with previously reported experimental tests performed with maize starch in a 5.2 m 3 vessel with a length/diameter ratio equal to 1.05 using three different vent areas. In addition, a sensitivity study was conducted with respect to some of the parameters involved in the numerical simulations, including dust/air mixture reactivity, grid resolution and area size and activation pressure of the venting device. The simulation results were generally in good agreement with the experimental values, but the CFD code overpredicted explosion pressures for the scenario with the smallest vent area. The sensitivity analysis indicated that the results were dependent on both grid resolution and mixture reactivity. Further simulations confirmed the influence of the activation pressure of the venting device on the explosion overpressure when the vent area was large in comparison to the volume, i.e. with a low K V (= V 2/3 / A ). These simulations made it possible to study scenarios outside the range of validity of current venting standards.

中文翻译：

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5 m 3 容器中排放粉尘爆炸的模拟

摘要 使用计算流体动力学代码 FLACS-DustEx 模拟排放粉尘爆炸。将结果与之前报道的在长度/直径比等于 1.05 的 5.2 m 3 容器中使用三个不同的排气区域进行的实验测试进行比较。此外，还对数值模拟中涉及的一些参数进行了敏感性研究，包括灰尘/空气混合物反应性、网格分辨率和通风装置的面积大小和启动压力。模拟结果通常与实验值非常吻合，但 CFD 代码高估了具有最小通风面积的场景的爆炸压力。敏感性分析表明，结果取决于网格分辨率和混合物反应性。进一步的模拟证实了当排气面积与体积相比较大时，即具有低 KV (= V 2/3 / A ) 时，排气装置的启动压力对爆炸超压的影响。这些模拟使研究当前排放标准的有效性范围之外的情景成为可能。