排烟条件下舱室烟气溢流的数值模拟研究

Numerical Study of Overflow from Cabin with Vent

对排烟条件下不同火源功率及排烟速率下舱室竖向开口处的烟气流动进行数值模拟,发现中性面高度随着排烟量的增大而不断上移,烟气溢流量相应减小;随着火源功率的增大,中性面高度下移,溢流量增大。

The smoke belching out of the burning cabin via the vertical outlets, such as door or window, was studied numerically under different fire burning rate and vent rate. The numerical results indicated that when the smoke exhaust rate is relative- ly small, it is clear that there exists a neutral plane in vertical outlet. As the smoke exhaust rate increases, the neutral plane tends to move up, whereas the smoke overflow decreases, and as the burning rate increases, the neutral plane move down with he smoke overflow increases.