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数值模拟了爆炸激波管不同隔离段长度时管口稀疏波对试验段超压的影响。为了准确高效地模拟试验段入口的超压曲线,采用了一种将一维球对称程序和三维程序相结合的计算方法,并在一维计算中利用爆炸相似律,采用小当量爆炸来模拟实际超压波形。计算结果表明,隔离段长度L的变化不影响超压峰值;L小于等于20m时,稀疏波的影响使得试验段超压的作用时间、比冲量减小;L大于等于30m时,稀疏波对试验段超压无影响。 相似文献
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Shockwaves from fuel-air explosive (FAE) cloud explosions may cause significant casualties. The ground overpressure field is usually used to evaluate the damage range of explosion shockwaves. In this paper, a finite element model of multi-sources FAE explosion is established to simulate the process of multiple shockwaves propagation and interaction. The model is verified with the experimental data of a fourfold-source FAE explosion, with the total fuel mass of 340 kg. Simulation results show that the overpressure fields of multi-sources FAE explosions are different from that of the single-source. In the case of multi-sources, the overpressure fields are influenced significantly by source scattering distance and source number. Subsequently, damage ranges of overpressure under three different levels are calculated. Within a suitable source scattering distance, the damage range of multi-sources situation is greater than that of the single-source, under the same amount of total fuel mass. This research provides a basis for personnel shockwave protection from multi-sources FAE explosion. 相似文献
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顶部开口条件下油罐油气爆炸数值模拟 总被引:3,自引:0,他引:3
根据油罐油气爆炸特性,基于RNG k-ε湍流模型、Finate-Rate/Eddy-Dissipation化学反应模型和相应的控制方程,采用SIMPLE算法对顶部开口条件下油气爆炸发生与发展过程进行了数值模拟。基于数值模拟结果分析了顶部开口条件下油罐油气爆炸罐外超压和火焰特征,与实验结果吻合良好,该模型可以用来预测顶部开口条件下油罐油气爆炸强度。 相似文献
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《防务技术》2019,15(5):815-820
The waveform of the explosion shock wave under free-field air explosion is an extremely complex problem. It is generally considered that the waveform consists of overpressure peak, positive pressure zone and negative pressure zone. Most of current practice usually considers only the positive pressure. Many empirical relations are available to predict overpressure peak, the positive pressure action time and pressure decay law. However, there are few models that can predict the whole waveform. The whole process of explosion shock wave overpressure, which was expressed as the product of the three factor functions of peak, attenuation and oscillation, was proposed in the present work. According to the principle of explosion similarity, the scaled parameters were introduced and the empirical formula was absorbed to form a mathematical model of shock wave overpressure. Parametric numerical simulations of free-field air explosions were conducted. By experimental verification of the AUTODYN numerical method and comparing the analytical and simulated curves, the model is proved to be accurate to calculate the shock wave overpressure under free-field air explosion. In addition, through the model the shock wave overpressure at different time and distance can be displayed in three dimensions. The model makes the time needed for theoretical calculation much less than that for numerical simulation. 相似文献
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本文讨论了建筑消防给水系统在日常管理、防火检查中存在的问题,提出在消防给水设计中应采取的措施。 相似文献
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为探讨特种防护舱抗爆性能,进行了舱内爆炸原型试验,研究不同装药量下开闭盖状态防护舱内爆炸时的空气冲击波超压和舱体位移过程。结果表明:同药量下闭盖状态的空气冲击波超压明显高于开盖状态,即封闭舱内偶然爆炸时空气冲击波超压更高;随装药量的增大,舱壁的空气冲击波超压也在增大;舱体侧壁经过多次正反射作用均未发生碎片反应,顶盖泄爆措施对降低底板的空气冲击波超压十分有利;距爆心较近处的位移均比距爆心较远处的位移大。原型试验舱体完全破坏,但结构未发生崩溃式破坏,并无碎片及内爆的二次破片飞出,舱体具有一定的抗爆性能和较好的防破片能力。 相似文献
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马海清 《中国人民武装警察部队学院学报》2013,(12):54-57
依据大型储罐区油罐结构及储存油品性质,分析初始事故带来的物理效应对邻近设备的影响,对由蒸气云爆炸引起的多米诺效应进行了研究,计算了二次设备的损坏概率;分析了多米诺场景,计算了多米诺事故的扩展概率,并根据多米诺事故的后果得到了个人风险和社会风险曲线.通过蒸气云爆炸事故多米诺效应评价,为提高大型储罐区的本质安全提供理论支持. 相似文献
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