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首页> 外文期刊>Fuel >Shock wave evolution and overpressure hazards in partly premixed gas deflagration of DME/LPG blended multi-clean fuel
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Shock wave evolution and overpressure hazards in partly premixed gas deflagration of DME/LPG blended multi-clean fuel

机译：DME / LPG混合多清洁燃料部分预混气体丝物的冲击波演化和过度压力危害

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摘要

In order to reveal the shock wave propagation and overpressure hazards of DME (dimethyl ether)/LPG (liquefied petroleum gas) blended fuel in the process of partly premixed gas deflagration, both experimental apparatus and numerical model for multiple-gas explosion and propagation are established. The results show that the overpressure in the sharp-dropping overpressure hazards zone are generally more than 200 kPa, and the distribution range was 5.75-6.75 times of the maximum overpressure hazards zone. The overpressure in the gentle-dropping overpressure hazards zone is the smallest, but its propagation and influence distance is the largest, which can cause certain damage to people and buildings in the far field. The participation of DME at lean-fuel concentration had the greatest effect on the increase of overpressure hazards in the original premixed zone, which could reach 306.6%. The increase of equivalence ratio and the addition of DME fuel both accelerate the superposition of multiple pressure waves. High overpressure risk is always accompanied by high overpressure evolution speed. As equivalence ratio increases, the relationship between the average shock wave velocity and the DME blended ratio was linear, quadratic and cubic, also the flame acceleration mechanism by high burning rate and the flame deceleration mechanism by low combustion heat successively dominates.
机译：为了揭示DME（二甲醚）/ LPG（液化石油气）混合燃料的冲击波传播和超压危险在部分预混合的气体净化过程中，建立了多气爆炸和传播的实验装置和数值模型。结果表明，尖锐过压危险区的超压通常大于200kPa，分配范围为最大过压危险区的5.75-6.75倍。温柔的过度压力危险区的超压是最小的，但其传播和影响距离是最大的，这可能对远场中的人和建筑物造成某些损害。 DME在瘦燃料浓度下的参与对原始预混区的过度压抑危害的增加具有最大的影响，这可能达到306.6％。等效率的增加和DME燃料的添加都加速了多个压力波的叠加。高过度压力风险总是伴随着高过度的进化速度。随着等效比增加，平均冲击波速度和DME混合比之间的关系是线性的，二次和立方体，通过高燃烧速率和火焰减速机构依次占据主导地位的火焰加速机构。

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  • 来源
    《Fuel》 |2020年第may15期|117368.1-117368.13|共13页
  • 作者

    Zhang Qi; Qian Xinming; Fu Liye; Yuan Mengqi; Chen Yuying;

  • 作者单位

    Beijing Inst Technol State Key Lab Explos Sci & Technol Room 303 Beijing 100081 Peoples R China;

    Beijing Inst Technol State Key Lab Explos Sci & Technol Room 303 Beijing 100081 Peoples R China;

    Hong Kong Polytech Univ Dept Bldg Serv Engn Hong Kong Peoples R China;

    Beijing Inst Technol State Key Lab Explos Sci & Technol Room 303 Beijing 100081 Peoples R China;

    Beijing Inst Technol State Key Lab Explos Sci & Technol Room 303 Beijing 100081 Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Gas deflagration; Original premixed zone; DME/LPG blended fuel; Shock wave evolution; Overpressure hazards;

    机译：燃气净化;原始预混区;DME / LPG混合燃料;冲击波进化;过度压抑危险;

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