Abstract
The influence of fire position on the neutral plane height was analyzed in order to analyze the smoke movement. One inner corridor building multiple openings was constructed by computational fluid dynamics (CFD) software and the airflow velocity and the pressure distribution under different fire position. The result shows that the influence of fire position on the height of neutral plane can be divided into two phases and the base height (Hb) is put forward as the critical values for the two phases. When the he height of fire (hf) is lower than Hb, namely hf< Hb, with the hf increasing, the neutral plane height increase is not significant. However, when the hf>Hb, with the fire height increasing, the neutral plane height increase significantly. Additionaly, in the condition, the position of neutral plane will be on the same level as that of the fire soucrce.
Highlights
With the rapid development of urbanization, many high-rise buildings have been constructed all over the world
It is can be observed that when hf is higher than Hb, the position of neutral plane will be on the same level as that of the fire soucrce
A set of computational fluid dynamics (CFD) simulations using FDS were carried out to study the influence of fire position on the neutral plane height for inner corridor building with multiple openings
Summary
With the rapid development of urbanization, many high-rise buildings have been constructed all over the world. When the smoke spread into these vertical shafts, the stack effect will form At this time, a horizontal plane will appear, where the pressure inside equals to the one outside, which is called the neutral plane [3]. Klote [4] assumed a developed calculation model for estimating the height of the neutral plane based on the assumption that the smoke temperature in vertical shafts is uniform. Mao et al [7] developed a new model to calculate the neutral plane height which considered the smoke temperature and the openings size. Many different models for calculating the height of neutral plane in buildings have been proposed in previous studies. In these models, the fire source is assumed on the first floor in building. A set of numerical simulations were conducted to study the influence of fire location on the height of the neutral plane in an inner corridor building with multiple openings
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