Experimental Investigation on the Variation in Solid Fuel Fire Whirl Properties with Imposed and Fuel Rotation

IF 2.3 3区工程技术 Q2 ENGINEERING, MULTIDISCIPLINARY

Fire Technology Pub Date : 2024-08-29 DOI:10.1007/s10694-024-01627-4

Pushpendra Kumar Vishwakarma, Kirti Bhushan Mishra, A. Aravind Kumar

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Abstract

This work presents a study on the formation of laboratory- scale fire whirls using forest fuels to replicate real-world fire whirls. A total of 48 experiments are conducted using three distinct types of forest fuels, namely Pinus Roxburghii, Shorea Robusta, and Grevillea Robusta, with three fuel pans of diameter 0.2 m, 0.3 m, and 0.4 m, respectively. Different characteristics such as Mass Burning Rate (MBR), Heat Release Rate (HRR), flame height, flame temperature, radiative heat flux and fire effluents are measured for a range of HRRs 40-346 kW and correlations are developed in terms of circulation and diameter. In comparison to free burning, the HRR was found to be increased by 300% with imposed rotation which was further increased up to 65% with fuel rotation. The flame heights are also increased by 30% in the case of imposed rotation and 40% with both imposed and fuel rotation. A detailed measurement of fire effluents revealed that their concentrations for fire whirls were reduced in the range of 50% to 400% compared to free burning fires. Furthermore, the developed correlations were applied to fire whirls of HRRs (up to ∼ 1900 kW) and their validity in predicting the characteristics was ensured.

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固体燃料火焰漩涡特性随外力作用和燃料旋转而变化的实验研究

本研究利用森林燃料对实验室规模火旋的形成进行了研究，以复制现实世界中的火旋。共进行了 48 次实验，使用三种不同类型的森林燃料，即 Pinus Roxburghii、Shorea Robusta 和 Grevillea Robusta，并分别使用直径为 0.2 米、0.3 米和 0.4 米的三个燃料盘。在 HRR 为 40-346 kW 的范围内测量了不同的特性，如质量燃烧速率 (MBR)、热释放速率 (HRR)、火焰高度、火焰温度、辐射热通量和火灾流出物，并根据循环和直径建立了相关关系。与自由燃烧相比，外加旋转使 HRR 增加了 300%，燃料旋转使 HRR 进一步增加了 65%。外加旋转的火焰高度也增加了 30%，外加旋转和燃料旋转的火焰高度都增加了 40%。对火焰流出物的详细测量显示，与自由燃烧的火焰相比，火焰旋流的流出物浓度降低了 50% 至 400%。此外，所建立的相关关系还被应用于 HRRs（最大功率可达 1900 千瓦）的火旋，并确保了其在预测特征方面的有效性。

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来源期刊

Fire Technology 工程技术-材料科学：综合

CiteScore

6.60

自引率

14.70%

发文量

137

审稿时长

7.5 months

期刊介绍： Fire Technology publishes original contributions, both theoretical and empirical, that contribute to the solution of problems in fire safety science and engineering. It is the leading journal in the field, publishing applied research dealing with the full range of actual and potential fire hazards facing humans and the environment. It covers the entire domain of fire safety science and engineering problems relevant in industrial, operational, cultural, and environmental applications, including modeling, testing, detection, suppression, human behavior, wildfires, structures, and risk analysis. The aim of Fire Technology is to push forward the frontiers of knowledge and technology by encouraging interdisciplinary communication of significant technical developments in fire protection and subjects of scientific interest to the fire protection community at large. It is published in conjunction with the National Fire Protection Association (NFPA) and the Society of Fire Protection Engineers (SFPE). The mission of NFPA is to help save lives and reduce loss with information, knowledge, and passion. The mission of SFPE is advancing the science and practice of fire protection engineering internationally.