论文部分内容阅读
通过在1/3尺寸的高层建筑楼梯井实验台内开展火灾烟气运动试验,对不同开口位置情况下,楼梯井内烟气的竖向温度分布、进出风口速度以及烟气前锋上升时间进行了研究。结果表明,烟气温度沿楼梯井竖直方向衰减较快,并且开口位置对井内的竖向温度分布有较大影响,随着开口高度的减小,其上方楼层的烟气温度降低。开口的存在也会减缓烟气向楼梯井上部蔓延,且开口位置越低,烟气的蔓延速度越慢;反之,升高开口位置,楼梯井上下贯通的竖向结构与外界环境间的对流加强,烟气在楼梯井内的竖向蔓延速度也会加快。
Through the test of fire smoke in the test bench of one-third-dimension high-rise building stairwell, the vertical temperature distribution, the speed of the air inlet and outlet and the rising time of the flue gas striker under different opening positions were studied. . The results show that the flue gas temperature decays rapidly along the vertical direction of the shaft, and the position of the opening has a significant effect on the vertical temperature distribution in the shaft. As the opening height decreases, the flue gas temperature on the upper floor decreases. The existence of the opening also slows the spread of flue gas to the upper part of the stairwell, and the lower the location of the opening, the slower the spread of the flue gas. On the contrary, the position of the opening is increased, and the convection between the vertical structure up and down the stairwell and the external environment is strengthened , Vertical flue gas in the stairwell will also accelerate the rate of spread.