The suppressions of ultrafine water mists containing additives (NaCl and NaHCO₃) on 100 nm, 5 μm, and 30 μm polymethyl methacrylate (PMMA) dust explosions were experimentally studied in a dust-explosion apparatus. High-speed photography showed that maximum vertical positions and flame propagation velocities were significantly decreased by suppression with ultrafine water mist/additives. Flame propagation velocities in 100 nm, 5 μm, and 30 μm dust explosions suppressed by the ultrafine pure water mist were reduced by 48.2%, 27.7%, and 15.3%, respectively. Maximum temperatures and temperature rising rates measured by a fine thermocouple in nano- and micro-PMMA dust explosions were also significantly decreased. It was proved that the addition of NaCl and NaHCO₃ improved the suppression effects of the ultrafine pure water mist. The improvement of explosion suppression by an 8% NaHCO₃ mist was superior to that of a 16% NaCl mist. The suppression mechanisms of ultrafine water mist/additives are further discussed by analyzing the physical and chemical effects.

在粉尘爆炸装置中，通过实验研究了含有添加剂（NaCl和NaHCO ₃）的超细水雾在100 nm，5μm和30μm聚甲基丙烯酸甲酯（PMMA）粉尘爆炸的抑制作用。高速摄影表明，通过超细水雾/添加剂的抑制作用，最大垂直位置和火焰传播速度显着降低。超细纯水雾抑制的100 nm，5μm和30μm尘埃爆炸的火焰传播速度分别降低了48.2％，27.7％和15.3％。通过精细热电偶测量的纳米级和微米级PMMA尘埃爆炸中的最高温度和升温速率也显着降低。事实证明，NaCl和NaHCO _3的添加改善了超细纯水雾的抑制效果。8％NaHCO ₃雾对爆炸抑制的改善优于16％NaCl雾对爆炸的抑制。通过分析其物理和化学作用，进一步讨论了超细水雾/添加剂的抑制机理。