The roles that dust layers play in dust explosions were investigated in a 58 m-long and 351 mm-diameter horizontal Flame Acceleration Tube (FAT) with two ends closed. One kind of coal dust, 13.22% (mass) in volatile and 23 u m (mean) in diameter, was layered on the bottom of the FAT. The overpressure of explosions was monitored at different locations along the FAT. The study demonstrated that the moisture content of the dust and the strength of the primary gas explosion are the factors that determine the severity of layered dust explosions. If the primary explosion is strong enough, the quasi-detonation of the low volatile coal dust even achieves. Obstacle in layered dust explosions plays an abnormal role relative to gas or pre-suspended dust explosion. Tertiary or fourth dust explosions can occur in 40 milliseconds behind the primary gas explosion. It can be explained by the irregular eddies resulting from obstacles.
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机译：灰尘层在灰尘爆炸中起作用的作用在58米长，直径351毫米的水平火焰加速管（脂肪）中，闭合了两端。一种粉粉体，直径为13.22％（质量），直径为23 u m（平均值），在脂肪的底部层叠。在沿着脂肪的不同位置监测爆炸的超压。该研究表明，粉尘的水分含量和主要气体爆炸的强度是确定分层粉尘爆炸的严重程度的因素。如果初级爆炸足够强大，则低位挥发性煤尘的准爆炸甚至实现了。分层粉尘爆炸中的障碍物相对于气体或预悬的粉尘爆炸起着异常作用。第三次或第四粉尘爆炸可能在初级气体爆炸后面的40毫秒内发生。它可以由障碍物产生的不规则漩涡解释。
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