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Study on Behavior of Methane/Oxygen Gas Detonation Near Propagation Limit in Small Diameter Tube: Effect of Tube Diameter

机译:小直径管子中接近传播极限的甲烷/氧气爆炸行为研究:管子直径的影响

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摘要

The unstable behavior of the detonation is an important issue in predicting detonation limits and safety problems. The present study aims to obtain information of the unstable behavior near the detonation propagating limit in methane/oxygen gas mixture for various initial pressures and tube diameters. The detonation velocity rapidly decreases near alpha = 1.0 and deviates from the theoretical value for alpha < 1.0 conditions (alpha = pi d/lambda; d: tube diameter; lambda: cell width). The onset of the single-head spinning is alpha = 1.0. For alpha < 1.0 conditions, the transition to the single-head spinning from small cells and the failure of cellular patterns were observed. For alpha > 1.0 conditions, the propagation mode was unstable. The unstable phenomenon means that the cellular pattern repeats multi-head and single-head spinning in turn.
机译:爆炸的不稳定行为是预测爆炸极限和安全问题的重要问题。本研究旨在获得在各种初始压力和管径下,甲烷/氧气混合物中在爆炸传播极限附近的不稳定行为的信息。在α<1.0的条件下,爆炸速度迅速降低,并偏离理论值(α= pi d /λ; d:管径;λ:单元宽度)。单头旋转的开始时间为alpha = 1.0。对于α<1.0的条件,观察到了从小细胞向单头旋转的过渡以及细胞模式的失败。对于alpha> 1.0的条件,传播模式不稳定。不稳定现象意味着细胞模式依次重复多头和单头旋转。

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