In this study, a self‐designed small cylindrical vessel was used to perform a dust explosion venting experiment through a bent duct. Based on this experiment, the influence of the bend distance and the static activation overpressure of the venting film on the explosion overpressure and the flame propagation was investigated. The results showed that both the maximum venting overpressure and pressure rise rate within the vessel increased with the decrease in the bend distance and increase in the static activation overpressure. In contrast, the duration of the combustion within the vessel exhibited the opposite trend. A typical “three‐peak” overpressure structure formed by the film rupture shock wave, secondary explosion in the duct, and continuous combustion within the vessel was observed in the duct. The third peak overpressure was dominant throughout the process. The intensity of the secondary explosion in the duct was positively correlated with the bend distance and static activation overpressure. Shorter bend distances led to greater peak‐overpressure drops after passing the bend. However, the attenuation of the secondary explosion intensity along the duct with static activation overpressure is not obvious.

中文翻译：

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弯曲管道排放粉尘爆炸的实验研究

在这项研究中，使用了一个自行设计的小型圆柱形容器，通过弯曲的管道进行了粉尘爆炸排放实验。在此实验的基础上，研究了排气膜的弯曲距离和静态激活超压对爆炸超压和火焰传播的影响。结果表明，容器内最大排气超压和压力上升率均随着弯距的减小和静态激活超压的增加而增大。相反，容器内的燃烧持续时间表现出相反的趋势。在管道中观察到了由薄膜破裂冲击波，管道中的二次爆炸以及容器内持续燃烧形成的典型“三峰”超压结构。在整个过程中，第三个峰值超压占主导地位。管道中二次爆炸的强度与弯曲距离和静态激活超压呈正相关。弯曲距离越短，通过弯曲后导致更大的峰值超压降。但是，沿管道的二次爆炸强度在静态激活超压作用下的衰减并不明显。