有限长度倾斜通道内火灾近上壁面区域温度特性

摘要

In order to explore the motion characteristics of hot smoke, a laboratory bench of a short inclined rectan-gular channel was constructed to conduct fire experiments.Methanol, ethanol and propanol were taken as fuel with the channel angles of inclination being 0°, 3°, 6°and 9°, respectively.The temperature distribution in the region near the ceiling was measured and the corresponding variation law between dimensionless temperature and dimen-sionless length was ascertained.Experimental results showed that the inclination change can be obtained utilizing the temperature variation formula of horizontal channel and the variation formulas of the temperature decaying coeffi-cient in the regions of upstream and downstream.%为了掌握有限长度矩形倾斜通道内发生火灾时，通道内近上壁面区域内的热烟气在自然对流作用下的运动特性，在搭建的倾斜矩形短通道火灾实验台上分别以甲醇、乙醇和丙醇作为燃料，在通道倾斜角度为0°、3°、6°和9°时进行了火灾实验，测量了通道内近上壁面区域的热烟气温度分布情况，确定了倾斜短通道内近上壁面区域无量纲温度随无量纲距离的变化规律，并在水平通道温度变化公式基础上，通过对实验结果拟合得到了通道上、下游温度衰减系数随倾角的变化公式。