基于数值模拟的超高中庭排烟系统性能研究

Study on the smoke exhaust system of ultrahigh atrium based on the numerical simulation

采用数值模拟对超高中庭的排烟系统进行研究。考虑热障效应对烟气发展的影响,对比分析机械排烟和自然排烟,以及不同排烟口高度对排烟效果的影响。研究发现,超高中庭存在垂直方向上的温度梯度,排烟系统应根据温度梯度设置。在不同火灾场景和排烟措施模拟中,自然排烟效果要优于机械排烟,中部排烟要优于顶部排烟。根据模拟结果给出了超高中庭设置排烟系统的思路。

The exhaust system of hltrahigh atrium is studied based on the numerical simulation technique. The smoke move- ment in the atrium is influenced by the thermal barrier effect which is caused by the vertical temperature gradient. The smoke control effect is analyzed by considering different smoke control measures and different height of smoke outlet. The re- sults show that the natural smoke extraction is superior to the mechanical smoke exhaust, and the smoke control measure in the central is more efficient than that in the top of atrium. The design thought of smoke exhaust system is provided based on the simulated results.