單洞雙向公路隧道火災通風排煙控制研究
[Abstract]:Although in recent years, due to the economic development, transportation demand, people living convenience needs, there have been a large number of double-hole one-way highway tunnel. However, there are still a large number of single-hole and bidirectional highway tunnels in western China due to topography, economy and other reasons. Once a fire occurs in a single-hole two-way tunnel, compared with a two-hole one-way tunnel, it will cause more serious consequences because of its characteristics of the opposite direction. In tunnel fire, smoke has a great influence on evacuation and rescue. Because of the complexity of the terrain and the different slope of the tunnel, the ventilation control strategy which is widely used now is not suitable. This paper mainly studies the ventilation control of single-hole two-way highway tunnel under different slope conditions. According to the different ventilation direction, the fire scene under the 20MW fire source power is drawn up, and the model of the single hole two-way highway tunnel is established by using FLUENT software to carry out the numerical simulation, and it is divided into two kinds of cases, which are blowing wind up the tunnel slope and blowing the wind down the tunnel downhill direction, and draw the fire scene under the 20MW fire source power. The characteristics of smoke field and temperature field are analyzed and studied. At the same time, the critical wind speed of different blowing direction is simulated. Based on the above research, a suitable ventilation control strategy is given. The main research results are as follows: (1) the study of smoke supply and exhaust along the upper slope of the tunnel is carried out to obtain the characteristics of smoke spread distance and temperature field of tunnel fire under different slope and wind speed. (2) the study of smoke supply and exhaust along the downhill direction of tunnel is carried out, and the characteristics of smoke spread distance and temperature field of tunnel fire under different slope and wind speed are obtained. (3) the study of critical wind speed along the downhill direction of a tunnel is carried out and compared with the critical wind speed without slope calculated by empirical formula. (4) based on the above research results, the control principle of ventilation and exhaust smoke in single-hole two-way highway tunnel is put forward to form the organization scheme of fire ventilation and smoke exhaust under the condition of different natural wind speed and wind direction of single-hole two-way highway tunnel.
【學位授予單位】:西南交通大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:U453
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