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<p>Hydrogen, methane and propane are three commonly used clean energy sources. Gas explosion accidents in buildings are mainly caused by these three gases. The propagation law of gas explosion is the basis for accurate identification of accident consequences and hazards. In this study, we investigated the explosion overpressure, explosion flow and explosion temperature distribution of the three types of gas in indoor. The explosion overpressure of the H<sub>2</sub>/air decays with distance sharply. In the far field, the explosion overpressure of C<sub>3</sub>H<sub>8</sub>/air is the highest of the three gases. The explosion temperature and the range of the flame of H<sub>2</sub>/air are lower than those of the other two gases. For the scenario examined in this studied, the ratio between the range of flame of H<sub>2</sub>/air explosion and the length of the enclosure is 1.43, which is less than 2.22 of the other two gases, respectively. The explosion reaction duration of H<sub>2</sub>/air is an order of magnitude less than that of CH<sub>4</sub>/air or C<sub>3</sub>H<sub>8</sub>/air. The explosion characteristics and effects of the three combustible gases in room and at vents are very different, and the explosion behavior of the three gases is not comparable.</p>

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Explosion and flow characteristics of combustible gases at stoichiometric concentrations indoors and outdoors

  • 期刊论文

  • 发表日期：

    2026年5月7日

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  • Yongsheng Jia,
  • Qi Zhang,
  • Yaxing Wang,
  • Wenqi Fan

摘要

Hydrogen, methane and propane are three commonly used clean energy sources. Gas explosion accidents in buildings are mainly caused by these three gases. The propagation law of gas explosion is the basis for accurate identification of accident consequences and hazards. In this study, we investigated the explosion overpressure, explosion flow and explosion temperature distribution of the three types of gas in indoor. The explosion overpressure of the H2/air decays with distance sharply. In the far field, the explosion overpressure of C3H8/air is the highest of the three gases. The explosion temperature and the range of the flame of H2/air are lower than those of the other two gases. For the scenario examined in this studied, the ratio between the range of flame of H2/air explosion and the length of the enclosure is 1.43, which is less than 2.22 of the other two gases, respectively. The explosion reaction duration of H2/air is an order of magnitude less than that of CH4/air or C3H8/air. The explosion characteristics and effects of the three combustible gases in room and at vents are very different, and the explosion behavior of the three gases is not comparable.