Size scale effect on mass burning flux and flame behavior of solid fuels

IF 3 3区 工程技术 Q2 CHEMISTRY, ANALYTICAL
Peiyi Sun, Tianhang Zhang, Xinyan Huang
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Abstract

The study investigates the horizontal fuel size effect on free-burning fires for PMMA plates and wood cribs. The fuel size effect on mass burning flux and flame behavior is mainly discussed and compared with typical pool fires. For the PMMA plate and liquid pool, when the fuel size is small (< 10 cm), either the 3D sidewall burning of PMMA or the container wall heated by flame can promote the burning flux at the horizontal projection area. As the fuel size increases, these side wall burning or heating effects decrease, causing the drop in burning flux with fuel scale for both the PMMA plate and liquid pool. For small-scale wood cribs, fire cannot self-sustain due to the large airflow cooling. With the increase in wood crib size, the burning rate first remains constant and then gradually increases, driven by the enhanced internal radiation. As the fuel size increases above 20–30 cm, the flame radiation dominates the burning flux for all fuel types. Fire dynamics simulator (FDS) was adopted to simulate the horizontal size effect by setting a varied fire source (horizontal projection) area. First, the flame geometry and heat release rate (HRR) of simulations were validated against experimental results. Subsequently, the validated fire model generates cases covering a broad range of fire scales. Finally, a new correlation of flame height with the fire heat release rate and fuel size is proposed, and its prediction capability is validated in the numerical fire modeling. This study quantifies the size effect on the burning rate for common solid fuels and provides valuable information for the numerical modeling of multi-scale fires.

尺寸尺度对固体燃料质量燃烧通量和火焰行为的影响
该研究调查了水平燃料尺寸对 PMMA 板材和木板箱自由燃烧火灾的影响。主要讨论了燃料尺寸对质量燃烧通量和火焰行为的影响,并与典型的水池火灾进行了比较。对于 PMMA 板和液体池,当燃料尺寸较小时(10 厘米),PMMA 的三维侧壁燃烧或容器壁被火焰加热都会促进水平投影区域的燃烧通量。随着燃料尺寸的增大,这些侧壁燃烧或加热效应会减弱,从而导致 PMMA 板和液体池的燃烧通量随着燃料尺寸的增大而下降。对于小尺寸的木箱,由于气流冷却较大,火无法自我维持。随着木箱尺寸的增大,燃烧速率先是保持不变,然后在内部辐射增强的驱动下逐渐增加。当燃料尺寸增大到 20-30 厘米以上时,火焰辐射将主导所有类型燃料的燃烧通量。采用火灾动力学模拟器(FDS),通过设置不同的火源(水平投影)面积来模拟水平尺寸效应。首先,根据实验结果验证了模拟的火焰几何形状和热释放率(HRR)。随后,经过验证的火灾模型生成了涵盖各种火灾规模的案例。最后,提出了火焰高度与火灾热释放率和燃料大小的新关联,并在火灾数值模拟中验证了其预测能力。这项研究量化了常见固体燃料的尺寸对燃烧速率的影响,为多尺度火灾的数值建模提供了有价值的信息。
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来源期刊
CiteScore
8.50
自引率
9.10%
发文量
577
审稿时长
3.8 months
期刊介绍: Journal of Thermal Analysis and Calorimetry is a fully peer reviewed journal publishing high quality papers covering all aspects of thermal analysis, calorimetry, and experimental thermodynamics. The journal publishes regular and special issues in twelve issues every year. The following types of papers are published: Original Research Papers, Short Communications, Reviews, Modern Instruments, Events and Book reviews. The subjects covered are: thermogravimetry, derivative thermogravimetry, differential thermal analysis, thermodilatometry, differential scanning calorimetry of all types, non-scanning calorimetry of all types, thermometry, evolved gas analysis, thermomechanical analysis, emanation thermal analysis, thermal conductivity, multiple techniques, and miscellaneous thermal methods (including the combination of the thermal method with various instrumental techniques), theory and instrumentation for thermal analysis and calorimetry.
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