中文摘要：

选用直径3-10,cm小尺寸圆形油盘,分别在低压（拉萨,0.067,MPa）与常压（合肥,0.100,MPa）条件下进行正庚烷池火燃烧实验.实验结果表明,在低压条件下,燃烧速率、火焰高度、振荡频率及振荡强度几项特征参量均比常压下大.在传导主控热反馈阶段,拉萨、合肥两地的燃烧速率比为0.81,小于对流、辐射主控的大尺寸池火.根据振荡频率经验公式f=k D^-0.5对小尺寸池火油盘直径和振荡频率进行拟合,低压下拟合值k=1.845,常压下k=1.632.振荡强度在6,cm油盘时均出现拐点,呈先降后升的趋势.

英文摘要：

The experiments on round small-scale pool fires of n-heptane with different diameters of 3—10,cm were conducted under low（Lhasa,0.067,MPa）and normal（Hefei,0.100,MPa）air pressure,respectively.Experimental results showed that the burning features such as burning rate,flame height,pulsation frequency and pulsation inten-sity under low pressure are all larger than those under normal pressure.When heat feedback was dominated by con-duction,the proportion of mass burning rate in Lhasa to that in Hefei was 0.81,which was less than that for convec-tion-dominated and radiation-dominated large-scale pool fires.The empirical formulaf=kD^-0.5 was used to describe the relationship between burner diameter and oscillation frequency.The fitted value ofk is 1.845 in Lhasa and 1.632 in Hefei.The flame fluctuation range changed from downtrend to uptrend when the diameter of burner was 6,cm.