细长密闭管道内油气爆炸特性研究

发布时间：2018-04-18 20:22

  本文选题：细长密闭管道 + 油气　； 参考：《振动与冲击》2017年09期

【摘要】：针对长径比对密闭管道内汽油蒸汽和空气的混合气爆炸特性的影响进行实验。研究表明:细长密闭管道内的油气爆炸压力为两阶段上升,而压力上升速率曲线呈现出"双峰"结构;最大爆炸压力和取得最大pmax值的最佳油气浓度均随管道长径比L/D的增加逐渐减小;达到最大爆炸压力所需时间随管道长径比L/D的增加呈线性关系增加,且靠近最佳油气浓度的油气受管道长径比的影响较小,而偏离最佳油气浓度较远的油气受管道长径比的影响较大;随着油气浓度的增大,第二个压力上升速率峰值先呈指数增长,达到峰值之后呈负指数下降;当油气浓度低于临界浓度时,第二个压力上升速率峰值比第一个压力上升速率峰值低,而高于临界浓度时则反之;第一个和第二个压力上升速率峰值及取得最大(dp/dt)max2值的油气浓度均随管道长径比L/D的增加而降低。这些规律性的结论可为管道的防抑爆设计提供理论依据和重要参考。
[Abstract]:The effect of aspect ratio on the explosion characteristics of gasoline vapor and air mixture in a closed pipe was studied.The results show that the explosion pressure of the oil and gas in the slender closed pipeline is two stages rising, and the pressure rising rate curve shows a "double peak" structure.The maximum explosion pressure and the optimum oil and gas concentration to obtain the maximum pmax value decreased gradually with the increase of the L- / D ratio of the pipeline, and the time required to reach the maximum explosion pressure increased linearly with the increase of the L- / D ratio of the pipeline.And the oil and gas near the optimum oil and gas concentration is less affected by the ratio of length to diameter of the pipeline, while the oil and gas far away from the optimum concentration of oil and gas is affected by the ratio of length to diameter of the pipeline, and with the increase of the oil and gas concentration,The second peak pressure rise rate increases exponentially first, then decreases exponentially after reaching the peak value, and when the oil and gas concentration is below the critical concentration, the second pressure rise rate peak is lower than the first pressure rise rate peak.The first and second peak pressure rise rates and the oil and gas concentration of the maximum dp- dttnmax _ 2 value decrease with the increase of the L- / D ratio of the pipeline length to diameter ratio when the critical concentration is higher than the critical concentration.These regular conclusions can provide theoretical basis and important reference for the design of pipeline anti-explosion.
【作者单位】： 后勤工程学院供油系;
【基金】：国家自然科学基金项目(51276195)
【分类号】：X932
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本文编号：1769925