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<p>Experiments on equal and unequal double rectangular pool fire of aviation kerosene (RP-5) were carried out in the wind speed range of 0–8.0 m/s. The results indicate that the flame merging state can be divided into three stages: fully merging, intermittent merging, and non-merging. Flame merging probability decreases with increasing pool spacing. The decreasing tendency of flame merging probability slows down in the wind environment. The merging probability is greater for unequal conditions than equal ones at the same pool spacing due to the larger pool size. Meanwhile, a predictive formula for the merging probability varying with <i>S</i>/<i>L</i><sub><i>S, V</i></sub> has been proposed. The burning rate generally increases with the growth of wind speed. The equivalent side length parameter <i>D</i>* is proposed based on pool size and pool spacing. The total burning rate is the sum of the burning rates of the two pools. Dimensionless treatment of the per unit area burning rate (<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\({\dot{m}}^{\prime \prime}_{total,V}/{\dot{m}}^{\prime \prime}_{total,0}\)</EquationSource> </InlineEquation>) under still air was performed. A linear formula for the dimensionless per unit area burning rate versus <i>Fr</i>* is presented. Under windy conditions, flames are tilted downwind, but the tilt angle of the downwind flames is reduced compared to the upwind flames as a result of the sheltering effect. The unequal pool condition demonstrates a greater sheltering effect on the downwind pool. Flame length increases and then decreases with growing wind speed. The flame length reaches its maximum at a wind speed of 6.0 m/s, but at higher wind speeds, vapors are blown away before ignition, leading to a shorter flame length. The burning rate correlation coefficient (<InlineEquation ID="IEq2"> <EquationSource Format="TEX">\({\dot{m}}^{\prime \prime}_{total,0}/{\dot{m}}^{\prime \prime}_{total}\)</EquationSource> </InlineEquation>) is introduced to eliminate the influence of oil pool size. An exponential relationship between dimensionless flame length (<i>L</i><sub><i>f</i></sub> /<i>D</i>*) and dimensionless heat release rate (<InlineEquation ID="IEq3"> <EquationSource Format="TEX">\({\dot{Q}}^{\ast} \cdot {\dot{m}}^{\prime}_{coe}\)</EquationSource> </InlineEquation>) was found and a prediction formula was proposed.</p>

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Experimental Study of Flame Morphology and Burning Rate of Equal and Unequal Pools Under Wind Environment

  • 期刊论文

  • 发表日期：

    2026年2月13日

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  • Shaohua Mao,
  • Nan Chen,
  • Jianping Song,
  • Dayu Zhang,
  • Zhen Mao,
  • Yulun Zhang

摘要

Experiments on equal and unequal double rectangular pool fire of aviation kerosene (RP-5) were carried out in the wind speed range of 0–8.0 m/s. The results indicate that the flame merging state can be divided into three stages: fully merging, intermittent merging, and non-merging. Flame merging probability decreases with increasing pool spacing. The decreasing tendency of flame merging probability slows down in the wind environment. The merging probability is greater for unequal conditions than equal ones at the same pool spacing due to the larger pool size. Meanwhile, a predictive formula for the merging probability varying with S/LS, V has been proposed. The burning rate generally increases with the growth of wind speed. The equivalent side length parameter D* is proposed based on pool size and pool spacing. The total burning rate is the sum of the burning rates of the two pools. Dimensionless treatment of the per unit area burning rate ( \({\dot{m}}^{\prime \prime}_{total,V}/{\dot{m}}^{\prime \prime}_{total,0}\) ) under still air was performed. A linear formula for the dimensionless per unit area burning rate versus Fr* is presented. Under windy conditions, flames are tilted downwind, but the tilt angle of the downwind flames is reduced compared to the upwind flames as a result of the sheltering effect. The unequal pool condition demonstrates a greater sheltering effect on the downwind pool. Flame length increases and then decreases with growing wind speed. The flame length reaches its maximum at a wind speed of 6.0 m/s, but at higher wind speeds, vapors are blown away before ignition, leading to a shorter flame length. The burning rate correlation coefficient ( \({\dot{m}}^{\prime \prime}_{total,0}/{\dot{m}}^{\prime \prime}_{total}\) ) is introduced to eliminate the influence of oil pool size. An exponential relationship between dimensionless flame length (Lf /D*) and dimensionless heat release rate ( \({\dot{Q}}^{\ast} \cdot {\dot{m}}^{\prime}_{coe}\) ) was found and a prediction formula was proposed.