Flame spread predictions over linear discrete fuel arrays using an empirical B -number model and stagnation point flow

Giovanni Di Cristina; Nicholas S. Skowronski; Albert SimeoniAli S. RangwalaSeong-kyun Im

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Flame spread predictions over linear discrete fuel arrays using an empirical B -number model and stagnation point flow

机译：Flame spread predictions over linear discrete fuel arrays using an empirical B -number model and stagnation point flow

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A stagnation-point flow model based in part on the mass transfer B -number was adapted to approximatethe heat flux and time to ignition of dowel arrays subject to forced convection flame spread. Previouswork on forced flow flame spread along a dowel array has characterized the existence of discretizedflame behavior. In deployment-scale wildland fire models, small fuels are smaller than the grid resolution.Sub-grid modeling then relies on empirical relationships, such as Nusselt number–Reynolds number( Nu-Re ) models, to estimate the fire spread. Current Nu-Re models utilized to calculate the heat flux andignition times predict higher heat transfer and faster ignition times with increasing flow speeds. However,analysis of the flame spread revealed that the ignition time has a parabolic relationship with theflow speed, with the fastest ignition time occurring around the onset of the discrete flame behavior. Nu-Re models cannot capture the upward inflection of ignition times beyond the onset of the discrete flamespread, where the ignition times increase with greater flow speeds. A boundary layer solution to theplume heat flux impinging on the next unignited dowel was employed to develop a B -number empiricalmodel. The B -number model captures the changes to mass and heat transfer induced by differencesin the flow speed and array spacing. The proposed empirical B -number model together with heat fluxapproximation generates more accurate predictions for ignition times than the existing approach.

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《Combustion and Flame》 |2021年第12期|111644.1-111644.9|共9页
作者
Giovanni Di Cristina; Nicholas S. Skowronski; Albert SimeoniAli S. RangwalaSeong-kyun Im;
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作者单位

Department of Aerospace and Mechanical Engineering, University of Notre Dame, Notre Dame, IN, United States;

USDA Forest Service, Northern Research Station, Morgantown, WV, United States;

Department of Fire Protection Engineering, Worcester Polytechnic Institute, 50 Prescott St., Worcester, MA 01605, United StatesDepartment of Aerospace and Mechanical Engineering, University of Notre Dame, Notre Dame, IN, United States,Department of Mechanical Engineering, Korea University, 319 Innovation Hall, 145 Anam-ro Seongbuk-gu, Seoul 02841, Republic of Korea;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
原文格式 PDF
正文语种英语
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B -number; Discrete fuel; Forced convection; Flame spread;

Flame spread predictions over linear discrete fuel arrays using an empirical B -number model and stagnation point flow

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