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为揭示瓦斯在强爆和弱爆情况下冲击波超压变化规律,利用一维爆炸物理模型和爆炸理论,构建了冲击波超压随距离变化的数学模型,并用一端开口的半封闭爆炸试验装置,在保持瓦斯浓度和其他条件不变,仅改变点火能量大小实现了瓦斯爆燃和爆轰,验证理论求解.结果表明:半封闭受限空间内,爆燃情况下火焰传播速度要远小于爆轰条件下火焰传播速度,爆燃火焰传播速度为亚音速,爆轰为超音速;爆轰与爆燃的冲击波超压的理论解都小于实验值,但整个传播变化趋势基本一致;极强冲击波最大超压值与传播距离成反比,极弱冲击波最大超压值与传播距离的平方根成反比;爆燃和爆轰冲击波在燃烧区内的传播变化趋势与理论解基本吻合.研究结果为防治瓦斯爆炸破坏及爆炸事故灾害勘验提供了技术和理论支持.
In order to reveal the variation law of shock overpressure under strong and weak explosion conditions, a mathematical model of shock overpressure variation with distance was established by using one-dimensional explosion physics model and explosion theory. With semi-enclosed explosion test equipment with one end opened, The gas concentration and other conditions are kept unchanged, and the gas deflagration and detonation are changed only by changing the ignition energy.The results show that the propagation speed of flame in deflagration case is far less than that in the detonation case in semi-confined confined space Propagation speed, deflagration flame propagation speed of subsonic, detonation supersonic; detonation and deflagration shock wave overpressure of the theoretical solution are less than the experimental value, but the entire propagation trend is basically the same; extremely strong shock wave maximum overpressure value and propagation Inversely proportional to the distance, the maximum overpressure value of the extremely weak shock wave is inversely proportional to the square root of the propagation distance. The propagation trend of the deflagration and detonation shock waves in the combustion zone basically agrees with the theoretical solution. The results are for preventing gas explosion damage and explosion hazard Experience provides technical and theoretical support.