【摘要】 对西藏古建筑中广泛使用的松木,分别在拉萨与合肥两地的燃烧小室内进行了着火试验.在恒定热流42 kW/m2下,测得了三种不同尺寸松木试样的表面温度曲线、着火温度和着火时间,并分析了氧气含量和压力对着火温度和着火时间的影响;通过对比试样着火图像序列,分析了火焰大小的差异.试验表明:三种试样在拉萨的着火时间远比在合肥的迟,着火温度要高,火焰体积更大.更多还原

【Abstract】 Experiments on the ignition characteristics of pine wood,a typical historical building material in Tibet’s have been conducted in cabin in Lhasa and Hefei.With externally applied radiation heat flux 42 kW/m~2,the surface temperature profiles of three pine specimens with different scales were measured in both regions,as well as ignition temperatures and pilot ignition time.The influence of oxygen quantity and pressure in both regions on these two parameters were surveyed,and the differences in flame size in both atmospheres were obtained by comparing the burning picture serial of pine specimens.The results show that the pilot ignition time of the three specimens was delayed in Lhasa,yet ignition temperatures were higher than those in Hefei and with bigger flame sizes as well.更多还原