【摘要】 开展了不同火源形状因子(1≤s≤3)的较大功率矩形油池火实验,测量了燃料的质量损失速率,借助编制的图像分析程序处理实验视频得到了连续火焰最大高度(Lc)和火焰最大高度(Lm).将Hasemi羽流中心线温度修正模型的理论预测值和实验值进行了对比,结果表明,随着s的增大,Hasem i理论模型预测值呈现增大的趋势,s=1时,理论预测值和实验值比较接近,两者无明显差异性;s=1.33和s=3时,理论预测值和实验值的变化趋势一致,但两者的总体偏差超过5%.更多还原

【Abstract】 Rectangular 0.5 m2 pool fires with the different aspect ratios of 1,1.33 and 3 were burned.The mass loss rate of fire and the centerline temperature distribution of plume were measured.Based on image processing by image analyzing program,maximum continuous flame height and maximum flame height were estimated.The centerline plume temperatures were then predicted by Hasemi’s model and further compared with the measured values in the experiments.It was shown that as the aspect ratio of pool fire increased,the deviation between the predicted and measured values was shown to increase;When the aspect ratio was equal to 1,the predicted values were close to the measured one; when the aspect ratio was 1.33 or 3,the predicted and measured values showed the similar variation trends,but their deviation exceeded 5 %.更多还原