The shock wave generated by a severe gas explosion accident can damage the main fan, and the toxic and harmful gases in the well cannot be discharged in time, leading to the expansion of disaster accidents. Therefore, it is meaningful to study impact loads of main fan blades in gas explosion. In this paper, a full-scale three-dimensional numerical simulation model has been established based on No. 2 Yangchangwan Coal Mine in China. The propagation of shock wave in shaft and air tunnel and the dynamic process of main fan blade subjected to shock load when gas explosion of different volume occurs in heading face have been simulated. The overpressure on the blade at different times, the overpressure distribution on the blade, and the relationship between the overpressure and the explosion intensity have been obtained. The results showed that the time when the explosion shock wave reached, each blade of the wind turbine was basically the same, and the time when each blade reached, the maximum overpressure was basically the same. With the increase of gas explosion volume, occurrence time of overpressure and maximum overpressure time on the fan blade were shortened, and the time interval between them was also shortened. There is a little difference in the overpressure of each blade. Fan blade directly above the hub was subject to the highest overpressure, and fan blade directly below the hub was subject to the lowest overpressure. The overpressure of the maximum overpressure blade was 5.44% to 6.77% higher than that of the minimum overpressure blade. The distribution of overpressure on each fan blade was uneven, and the overpressures on blade edges were the lowest. The overpressure on the fan blades showed a corrugated distribution along the radial direction. There was 12.06% to 15.40% difference between the maximum and minimum overpressure section on the fan blade.

中文翻译：

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瓦斯爆炸中主风扇叶片冲击载荷的数值模拟

严重的瓦斯爆炸事故产生的冲击波会损坏主风扇，井中的有毒有害气体无法及时排出，导致灾害事故扩大。因此，研究瓦斯爆炸中主风扇叶片的冲击载荷具有重要意义。本文基于杨长湾二号煤矿，建立了全尺寸三维数值模拟模型。模拟了在掘进面上发生不同体积的瓦斯爆炸时，冲击波在井筒和空气通道中的传播以及主风机叶片受到冲击载荷的动态过程。得到了不同时间叶片上的超压，叶片上的超压分布以及超压与爆炸强度之间的关系。结果表明，爆炸冲击波到达的时间，风轮机的每个叶片基本相同，而到达每个叶片的时间，最大超压基本相同。随着气体爆炸量的增加，风扇叶片上超压的发生时间和最大超压时间缩短，并且它们之间的时间间隔也缩短了。每个叶片的超压有少许差异。轮毂正上方的风扇叶片承受的最高超压，而轮毂正下方的风扇叶片承受的最低超压。最大超压叶片的超压比最小超压叶片的超压高5.44％至6.77％。每个风扇叶片上的超压分布不均匀，叶片边缘的超压最低。风扇叶片上的超压沿径向方向呈波纹状分布。风扇叶片上的最大和最小过压部分之间存在12.06％至15.40％的差异。