原木燃烧羽流的试验研究与数值模拟
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摘要
采用落叶松作为试验原木材料进行室外燃烧试验,水平和竖直方向设置热电偶,研究在0、2 m/s风速条件下原木燃烧时火羽流温度随时间的变化情况。采用FDS模拟原木燃烧火羽流温度,与试验结果进行对比。结果表明,FDS能够模拟原木燃烧火羽流的温度变化规律;火羽流中心线轴向温度随着高度的增加而降低,随着风速的增大降低的程度越大;经典模型可以预测原木燃烧火羽流的中心线轴向温度。
By an outdoor combustion experiment with log,the characteristics of the temperature of fire plume under the certain conditions of 0m/s and 2m/s speed of wind were studied.The thermal couples were set horizontally and vertically.The FDS was used to simulate the fire too.By contrastive analysis,it was showed that the temperature of fire plume in the process of log combustion could be simulated by FDS.The temperature of fire plume in centerline axial decreases with the increasing of the flame height and it decreases more with the increasing of the wind speed.The temperature of fire plume in centerline axial can be predicted by the classical model.
By an outdoor combustion experiment with log,the characteristics of the temperature of fire plume under the certain conditions of 0m/s and 2m/s speed of wind were studied.The thermal couples were set horizontally and vertically.The FDS was used to simulate the fire too.By contrastive analysis,it was showed that the temperature of fire plume in the process of log combustion could be simulated by FDS.The temperature of fire plume in centerline axial decreases with the increasing of the flame height and it decreases more with the increasing of the wind speed.The temperature of fire plume in centerline axial can be predicted by the classical model.
引文
[1]王悦,薛伟.基于BP神经网络的东北贮木场火灾危险等级评定[J].中国安全生产科学技术,2013,(2):173-176.
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[6]彭好义,姚昆,蒋绍坚,等.氧体积分数对木质和玉米秸秆燃烧特性的影响[J].热科学与技术,2014,(1):61-66.
[7]MORANDINI F,SANTONI P A,BALBI J H.Validation study of a two-dimensional model of fire spread across a fuel bed[J].Combustion Science and Technology,2000,157(1):141-165.
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[9]杨华,何苗.轴对称羽流模型与数值模拟的对比及评价[J].消防科学与技术,2009,28(8):555-559.
[2]辛颖,薛伟.落叶松原木楞堆全尺寸火蔓延实验研究[J].消防科学与技术,2010,29(7):557-561.
[3]罗晓春,张光俊,薛伟.森工贮木场消防安全评估的内涵和方法[J].林业劳动安全,2006,(3):26-31.
[4]卞伟,薛伟.贮木场楞堆火灾的实验研究[J].森林工程,2006,20(3):1-4.
[5]陈志斌,胡隆华,霍然,等.矩形油池火羽流中心线的温度分布[J].燃烧科学与技术,2009,(3):249-253.
[6]彭好义,姚昆,蒋绍坚,等.氧体积分数对木质和玉米秸秆燃烧特性的影响[J].热科学与技术,2014,(1):61-66.
[7]MORANDINI F,SANTONI P A,BALBI J H.Validation study of a two-dimensional model of fire spread across a fuel bed[J].Combustion Science and Technology,2000,157(1):141-165.
[8]辛颖,薛伟.原木楞堆燃烧实验与数值模拟研究[J].消防科学与技术,2014,33(5):480-483.
[9]杨华,何苗.轴对称羽流模型与数值模拟的对比及评价[J].消防科学与技术,2009,28(8):555-559.