【摘要】 首先研究了在城镇森林交界域,利用圆柱火焰面辐射几何模型预测典型树冠火辐射的理论依据;然后选用雪松为实验树,利用ISO9705全尺寸多功能热释放速率实验台,分别在封闭和开放空间进行了实验研究,测量了雪松的热释放速率随时间的变化规律以及雪松树冠火的辐射热通量随时间的变化.实验表明,雪松预燃时间短,燃烧速度快,火焰功率很大,在开放空间无外部通风或通风较弱的条件下,圆柱模型能够准确地预测树冠火辐射热流密度随时间的变化.更多还原

【Abstract】 A theoretical study is first made of the prediction of radiation of typical crown fire,utilizing the cylindrical geometry model.And then an experiment is conducted to study the radiation problem of crown fire in wildland-urban interlace (WUI),using a full-scale heat release rate platform for multifunctional measurement.The heat release rate of cerdar tree fires and the radiant flux density are measured and investigated in the experiment.Through theoretical analysis,the rationality of the cylindrical modal is validated.The applied condition,under which the cylindrical model is used to forecast typical radiation of crown fire,is present- ed.At the same time,the experimental data is available for the preventing and extinguishing WUI fires.更多还原