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<p>Ignition source position impacts the combustion characteristics of premixed flammable gases. However, explosion experiments have rarely been performed in confined spaces with a weakly constrained surface. Therefore, to explore the characteristics of gasoline–air mixture explosions in a confined petroleum pipeline trench space at different ignition positions, we performed explosion venting experiments. Pressure data were collected using a DHDAS dynamic signal acquisition and analysis system, and flame behavior was captured using an HX-3E high-speed camera. Specifically, we investigated the effects of three different ignition positions on explosion overpressure characteristics and flame morphology at an initial gasoline–air mixture volume fraction of 1.7%. The main results were as follows: (1) Ignition at the middle position (vent 3) resulted in the highest explosion power index during venting, making this condition the most dangerous; (2) Internal flame morphology evolution was divided into four stages, with post-explosion flame shapes resembling "brush-like" and "mushroom cloud"; (3) Different ignition positions led to different explosion overpressure characteristic parameters, flame shapes, and flame propagation speeds; (4) Selected typical working conditions were compared using high-speed photography images and local Schlieren images. Furthermore, the evolution of the explosion process was divided into six stages based on changes in pressure, flame, and flow field. This study provides theoretical support for improving explosion safety protection measures during petroleum storage, transportation, and refueling, and enhances our understanding of gasoline–air mixture combustion in pipeline trench spaces.</p>

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Effect of ignition position on vented gasoline–air mixture combustion in pipeline trench spaces with weakly confined surfaces

  • 期刊论文

  • 发表日期：

    2025年4月10日

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  • Dongliang Zhou,
  • Xinsheng Jiang,
  • Yunxiong Cai,
  • Li Liu,
  • Shijie Zhu,
  • Ri Chen,
  • Sai Wang,
  • Run Li

摘要

Ignition source position impacts the combustion characteristics of premixed flammable gases. However, explosion experiments have rarely been performed in confined spaces with a weakly constrained surface. Therefore, to explore the characteristics of gasoline–air mixture explosions in a confined petroleum pipeline trench space at different ignition positions, we performed explosion venting experiments. Pressure data were collected using a DHDAS dynamic signal acquisition and analysis system, and flame behavior was captured using an HX-3E high-speed camera. Specifically, we investigated the effects of three different ignition positions on explosion overpressure characteristics and flame morphology at an initial gasoline–air mixture volume fraction of 1.7%. The main results were as follows: (1) Ignition at the middle position (vent 3) resulted in the highest explosion power index during venting, making this condition the most dangerous; (2) Internal flame morphology evolution was divided into four stages, with post-explosion flame shapes resembling "brush-like" and "mushroom cloud"; (3) Different ignition positions led to different explosion overpressure characteristic parameters, flame shapes, and flame propagation speeds; (4) Selected typical working conditions were compared using high-speed photography images and local Schlieren images. Furthermore, the evolution of the explosion process was divided into six stages based on changes in pressure, flame, and flow field. This study provides theoretical support for improving explosion safety protection measures during petroleum storage, transportation, and refueling, and enhances our understanding of gasoline–air mixture combustion in pipeline trench spaces.