The strong blast wave in gas explosion accident could cause great casualties and property loss, which is the main threat to safety production and further popularization of hydrogen energy. This research focuses on the prediction of explosion overpressure in unconfined hydrogen cloud explosion with or without built-in obstacle. The flame acceleration caused by the obstacle causes two overpressure peaks. As the flame is accelerated by multi-layer obstacle, the positive overpressure peak is reached when the flame is still in the congested region. Based on the fractal factor, the prediction for overpressure and impulse curve is achieved and a prediction model for positive overpressure and impulse peak is proposed without built-in obstacle. For congested condition, a parameter is proposed and its value is linear with the propagation distance in the semi-logarithmic coordinate. The flame propagation process is divided into four regions according to the space position. Based on the prediction of , the prediction of positive overpressure impulse peak and upper limit of positive overpressure peak is achieved.

中文翻译：

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无侧限氢云爆炸爆炸超压预测模型

瓦斯爆炸事故中强烈的冲击波可能造成重大人员伤亡和财产损失，是安全生产和氢能进一步普及的主要威胁。本研究的重点是预测有或没有内置障碍物的无侧限氢云爆炸中的爆炸超压。障碍物引起的火焰加速导致两个超压峰值。由于火焰受到多层障碍物的加速，当火焰仍处于拥挤区域时就达到正超压峰值。基于分形因子实现了超压和冲量曲线的预测，提出了无内置障碍的正超压和冲量峰值预测模型。针对拥塞情况，提出了一个参数，其值在半对数坐标上与传播距离呈线性关系。火焰传播过程根据空间位置分为四个区域。基于 的预测，实现了正超压脉冲峰值和正超压峰值上限的预测。