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<p>To investigate the deflagration suppression process using water mist at different local spray positions in an obstructed, semi-confined duct, multiple experimental conditions were designed. It was observed that water mist positioned before obstacles causes a strong endothermic effect, which reduces the flame temperature and chemical reaction rate, resulting in the appearance of a yellow-colored flame. This yellow flame persists behind the flame front until the flame exits the duct. For water mist positioned between obstacles, heat absorption occurs in the region between and downstream of the obstacles, and the flame color gradually changes to yellow behind the flame front. In contrast, for water mist positioned after obstacles, the interaction time between the flame and the water mist is very short, and the flame color is almost identical to the condition without water mist. Additionally, as the water mist droplet size increased, both the evaporation rate and specific surface area decreased, impairing the mist’s effectiveness in reducing flame temperature and slowing reaction rate. At spray position before obstacles, water mist droplets with an 8-<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\upmu \)</EquationSource> <EquationSource Format="MATHML"><math> <mi mathvariant="normal">μ</mi> </math></EquationSource> </InlineEquation>m diameter effectively weakened the deflagration parameters, reducing maximum flame velocity, maximum overpressure, maximum overpressure rise rate, and deflagration intensity by 35.9%, 27.3%, 31.7%, and 50.4%, respectively.</p>

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Suppression of methane/hydrogen/air deflagration by local water mist spray

  • 期刊论文

  • 发表日期：

    2026年7月10日

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  • A. G. Bekele,
  • B. Zhang,
  • Y. Xia,
  • B. Wang,
  • Z. Siqi,
  • W. Yue

摘要

To investigate the deflagration suppression process using water mist at different local spray positions in an obstructed, semi-confined duct, multiple experimental conditions were designed. It was observed that water mist positioned before obstacles causes a strong endothermic effect, which reduces the flame temperature and chemical reaction rate, resulting in the appearance of a yellow-colored flame. This yellow flame persists behind the flame front until the flame exits the duct. For water mist positioned between obstacles, heat absorption occurs in the region between and downstream of the obstacles, and the flame color gradually changes to yellow behind the flame front. In contrast, for water mist positioned after obstacles, the interaction time between the flame and the water mist is very short, and the flame color is almost identical to the condition without water mist. Additionally, as the water mist droplet size increased, both the evaporation rate and specific surface area decreased, impairing the mist’s effectiveness in reducing flame temperature and slowing reaction rate. At spray position before obstacles, water mist droplets with an 8- \(\upmu \) μ m diameter effectively weakened the deflagration parameters, reducing maximum flame velocity, maximum overpressure, maximum overpressure rise rate, and deflagration intensity by 35.9%, 27.3%, 31.7%, and 50.4%, respectively.