Due to its industrial applications, the assessment of the explosibility parameters of aluminum powder is essential. However, they strongly depend on the Particle Size Distribution (PSD), which impacts both the rate-limiting step of the combustion mechanism and the radiative transfer. This article describes the influence of the test procedure on the explosion severity of six aluminum samples, having primary particle diameters ranging between 0.04 and 125 $\text{μ}\text{m}$. The PSD measured in situ after dispersion in a 20 L sphere differs from those obtained before dispersion, particularly for nanoparticles for which the presence of agglomerates is evidenced. The explosion severity parameters were measured at different turbulence levels by changing the nozzle geometry and ignition delay time. The impact of the injection procedure varies from micron-sized aluminum dust to nanoparticles due to their low inertia. Moreover, if an alternative nozzle could be more appropriate at a lower turbulence level, the rebound nozzle is always the most conservative option for standard test conditions. Finally, the mean particle surface area was identified as an appropriate indicator of the micro/nano scale's explosivity performance. Results suggest that below 3 ${\text{m}}^2/\text{g}$, the combustion would be diffusion-limited and kinetic-limited otherwise.

由于其工业应用，铝粉爆炸性参数的评估是必不可少的。然而，它们强烈依赖于粒度分布 (PSD)，它会影响燃烧机制的限速步骤和辐射传递。本文描述了测试程序对六个铝样品的爆炸严重程度的影响，其初级粒径范围在 0.04 和 125 之间$\text{μ}\text{米}$. 在 20 L 球体中分散后原位测量的 PSD 与分散前获得的不同，特别是对于证明存在附聚物的纳米颗粒。通过改变喷嘴几何形状和点火延迟时间，在不同湍流水平下测量爆炸严重性参数。由于惯性低，注射过程的影响从微米尺寸的铝粉到纳米颗粒不等。此外，如果替代喷嘴在较低湍流水平下更合适，则回弹喷嘴始终是标准测试条件下最保守的选择。最后，平均颗粒表面积被确定为微/纳米级爆炸性能的适当指标。结果表明，低于 3${\text{米}}^2/\text{G}$，否则燃烧将受到扩散限制和动力学限制。