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Modeling and Experimental Study on Merging Flame from Multi-Fire Sources

多火源融合火焰的建模与实验研究

基本信息

批准号：
04650543
负责人：
SUGAWA Osami
金额：
$ 1.28万
依托单位：
Science University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1993
项目状态：
已结题

项目摘要

Flame tip height which were showing merged form or inclined form from two rectangular fire sources in a parallel configuration, and from three and four circular pools in a symmetrical cofiguration were studied experimentally and theoretically. Two kinds of fuel, propane and hexane, were utilized for those fires respectively. Flame tip height in dimensionless form, L/L_m (where L and L_m are flame tip height and merged / inclined flame tip height without separation, respectively), was expressed successfully by a function of dimensionless hear release rate and dimensionless speparation distance between the fire sources, as in the form of L/L_m = (Q^<**>_m・f_s) ^<2/5> for square or circular pool fires and L/L_m = (Q^<**>_m・ f_1) ^<2/3> for rectangular or line fire sources. Q^<**>_m is defined as Q^<**>_m= Q/p ・ C_p・ T_o・ ROO<gD>・ D^2 for square/circular po ol fires, and Q^<**>_m= Q/p ・ C_p・ T_o・ ROO<gD>・ DW for rectangular/fine fires without separation between fire sources. And f_s and f_1 are the correction factors of apparent burning area to fire area and are defined as f_s = (S^2+n・ D^2)/n ・(S^2+D^2) for square/circular fire sources and as f_1 = (WD+S^2)/2・(DW+S^2) for line/rectangular fire sources, respectively. Where n is number of pool fire sources, D width of shorter length of rectangular burner or characteristic length of pool fire source, W width of longer length of rectangular burner, S separation between fire sources. The same correction was obtained on flame extension behavior when a rectangular or a circular fire sources approaches to the wall if we consider an imaginary fire source of the same size and in the same heat release inside a wall.

对平行布置的两个矩形火源和对称布置的三个和四个圆形池的火焰尖端高度进行了实验和理论研究。两种燃料，丙烷和己烷，分别用于这些火灾。无量纲形式的火焰尖端高度，L/L_m（其中L_m和L_m分别为无分离时的火焰尖端高度和合并/倾斜火焰尖端高度），成功地用无因次热释放速率和无因次火源间距的函数表示，对于方形或圆形池火，L/L_m =（Q^**>_m·f_s）^<2/5>;对于矩形或线火源，L/L_m =（Q^**>_m·f_1）^<2/3>。Q^** m定义为：对于方形或圆形池火，Q^** m= Q/p · C_p· T_o· ROO<gD>· D^2;对于矩形或细火，Q^** m= Q/p · C_p· T_o· ROO<gD>· DW。其中fs和f1为表观燃烧面积对火灾面积的修正系数，对于方形/圆形火源，fs =（S^2+n· D^2）/n ·（S^2+D^2）;对于线状/矩形火源，f1 =（WD+S^2）/2·（DW+S^2）。式中，n为池火源个数，矩形燃烧器较短长度或池火源特征长度的宽度D，矩形燃烧器较长长度的宽度W，火源间距S。当矩形或圆形火源靠近墙壁时，如果我们考虑相同尺寸和相同热量释放的假想火源，则对火焰扩展行为的修正也是相同的。