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<p>Unlike previous studies which primarily focused on burning rates and plume temperatures, the present work explicitly investigates how fuel pan elevation influences heat flux distribution within a compartment. The contribution of vitiated air to radiative heat transfer is quantified, and the impacts of both pan diameter and elevation are analyzed. To achieve this, twenty-four fire experiments were performed to measure the heat flux on the interior wall surfaces of the room. The test compartment is the size of 4&#xa0;m × 4&#xa0;m × 4&#xa0;m with a door of 2&#xa0;m in height (<i>H</i><sub>d</sub>) and 1&#xa0;m in width (W). The fuel mass loss rate, heat release rate (measured using LSHR Calorimetry), maximum upper layer gas temperature, and heat flux on the walls, ceiling, and floor of the compartment were quantitatively analyzed for diesel pool fires with pan diameters of 0.2, 0.4, 0.6, and 0.8&#xa0;m. These fires were conducted at six different pan elevations (i.e., <i>h</i>/<i>H</i><sub>d</sub> = 15%, 30%, 45%, 60%, 75%, and 90%). It was observed that as the fuel pan elevation (<i>h</i>) increased, the burning rate consistently decreased, leading to a reduction in the heat release rate. Radiative heat flux by hot gas was obtained higher for poor burning of fuel or when oxygen concentration decreased. Hence, the percentage of hot gas heat flux increases with increasing pan height or poor combustion. These experimental results led to the conclusion that the impacts of pan diameter and the burning reaction to vitiated air should be considered when classifying the burning regime of a pool fire.</p>

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Compartment heat flux measurement under elevated pool fires

  • 期刊论文

  • 发表日期：

    2025年10月3日

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  • Mahesh Kumar Tiwari,
  • Avinash Chaudhary,
  • Raj Kumar Mishra,
  • A. Aravind Kumar,
  • S. M. Tauseef,
  • Sivi Varghese,
  • Ravinder Kumar

摘要

Unlike previous studies which primarily focused on burning rates and plume temperatures, the present work explicitly investigates how fuel pan elevation influences heat flux distribution within a compartment. The contribution of vitiated air to radiative heat transfer is quantified, and the impacts of both pan diameter and elevation are analyzed. To achieve this, twenty-four fire experiments were performed to measure the heat flux on the interior wall surfaces of the room. The test compartment is the size of 4 m × 4 m × 4 m with a door of 2 m in height (Hd) and 1 m in width (W). The fuel mass loss rate, heat release rate (measured using LSHR Calorimetry), maximum upper layer gas temperature, and heat flux on the walls, ceiling, and floor of the compartment were quantitatively analyzed for diesel pool fires with pan diameters of 0.2, 0.4, 0.6, and 0.8 m. These fires were conducted at six different pan elevations (i.e., h/Hd = 15%, 30%, 45%, 60%, 75%, and 90%). It was observed that as the fuel pan elevation (h) increased, the burning rate consistently decreased, leading to a reduction in the heat release rate. Radiative heat flux by hot gas was obtained higher for poor burning of fuel or when oxygen concentration decreased. Hence, the percentage of hot gas heat flux increases with increasing pan height or poor combustion. These experimental results led to the conclusion that the impacts of pan diameter and the burning reaction to vitiated air should be considered when classifying the burning regime of a pool fire.