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Estimation of pressure distribution for shock wave through the bend of bend laneway

机译：弯道弯道冲击波压力分布估算

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摘要

Propagation of the air shock wave caused by explosion via the bend of a bend laneway has obvious nonlinear characteristics, compared with its propagation in a straight laneway. These characteristics are important bases to analyze the accident of gas explosion in underground mines and to estimate the blast resistance of underground structures in mines. In this work, the rule of the shock wave propagation via the laneway bend and the pressure distribution are studied by means of the numerical simulation approach. Theoretical results show that attenuation of the peak overpressure with distance does not obey exponent law when the air shock wave goes through the laneway bend. At some locations within the bend zone, the overpressures are higher than ones around those locations, the front of original plane wave bends in the bend of the laneway and after passing through the bend, it gradually returns to the state of plane wave propagation. There is a span dependent on the cross section dimension of laneway and the bend angle and increasing with the bend angle, in which the peak overpressure of shock wave does not uniformly attenuate with distance. When the bend angle is equal to 135°, this span is about five times as long as the corresponding equivalent diameter of the laneway. Additionally, the impulse of air shock wave attenuates uniformly via the laneway bend. On the end section of the complicated pressure distribution area in the bend, it is 66.65-98.7% of that in the straight laneway at the same scaled distance.
机译：与在直线巷道中传播相比，由爆炸引起的空气冲击波通过弯曲巷道的弯曲传播具有明显的非线性特性。这些特性是分析地下矿井瓦斯爆炸事故和评估矿井地下结构的抗爆炸性的重要依据。在这项工作中，通过数值模拟方法研究了冲击波通过车道弯道传播的规律和压力分布。理论结果表明，当空气冲击波通过巷道弯道时，峰值超压随距离的衰减不遵循指数规律。在弯曲区域内的某些位置，超压高于那些位置附近的压力，原始平面波的前部在巷道的弯曲处弯曲，并且在通过弯曲部后，逐渐返回到平面波传播的状态。跨度取决于巷道的横截面尺寸和弯曲角度，并随弯曲角度的增加而增大，其中冲击波的峰值超压不会随距离均匀衰减。当弯曲角度等于135°时，该跨度约为车道相应等效直径的五倍。另外，空气冲击波的脉冲通过车道弯曲均匀衰减。在相同比例距离下，弯道中复杂的压力分布区域的末端部分是直巷中压力的66.65-98.7％。

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