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运用CFD进行数字模拟,以了解纵向通风隧道内热烟气流的特性。通过模拟发现对火源进行模拟非常重要,热烟气流特性受火源位置的影响很大,并且对火源模拟方法很敏感。火源生成的火焰区是燃烧引起的化学反应区域。即使火源附近的木垛排列完好,也很难在考虑这些化学反应条件下模拟热生成区域。建议考虑纵向通风隧道内火焰形状并对它进行数字模拟。模拟结果与试验结果非常吻合。试验证明,在纵向通风隧道内,热烟气流从靠近墙体火源处顺风向隧道中心蔓延。数字模拟结果发现,火灾羽流造成的螺旋上升空气会在墙体和羽流之间形成一个涡流区。
CFD was used for numerical simulations to understand the characteristics of hot flue gas flow in longitudinally ventilated tunnels. It has been found through simulation that it is very important to simulate the fire source. The characteristics of the hot flue gas flow are greatly influenced by the location of the fire source and are very sensitive to the fire source simulation method. The flame zone generated by the fire source is the combustion-induced chemical reaction zone. Even if the wood stack near the fire source is well-arranged, it is difficult to model the heat-generating area under these chemical reaction conditions. It is advisable to consider the flame shape in the longitudinal ventilation tunnel and to digitally simulate it. The simulation results are in good agreement with the experimental results. Tests show that in the longitudinal ventilation tunnel, the hot flue gas flow from the wall near the source of the wind spread to the center of the tunnel. The numerical simulation found that spiraling air from the fire plume creates a swirling zone between the wall and the plume.