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针对超高层建筑施工中典型空气污染物氨气,运用CFD方法构建武汉中心三维立体模型,模拟标准k-ε条件下自然通风和机械通风2种抑制措施对氨气浓度整体影响效果并确定其影响进深。结果表明:稳态下机械通风对降低模型整体氨气浓度效果有限,单个送风口沿送风方向影响进深约为6.1m,垂直于风速方向约为1.2m,且送风口影响进深随风速变化极小;自然通风对降低模型整体氨气浓度效果明显,进风口对氨气浓度影响进深约为17.5m,随高度增加逐渐递增的进风速度在通风前15s对氨气浓度影响明显,稳态时风速增加自然通风影响进深增加有限;施工中可主要采用自然通风抑制氨污染,幕墙封闭后可利用机械通风并辅以导风板等设施提高机械通风影响效果。
According to the typical air pollutant ammonia in the construction of super high-rise buildings, CFD method was used to construct the three-dimensional model of Wuhan Center to simulate the effect of natural ventilation and mechanical ventilation on the overall ammonia concentration under standard k-ε conditions and to determine its effect depth. The results show that mechanical ventilation at steady state has a limited effect on reducing the overall ammonia concentration in the model. The influence of the single blower outlet on the blowing direction is about 6.1m and the perpendicularity to the wind speed is about 1.2m. The effect of natural ventilation on reducing the overall ammonia concentration of the model is obvious. The influence of the inlet air on the concentration of ammonia gas is about 17.5m. The increasing of the inlet air velocity with increasing height has a significant effect on the ammonia concentration 15s before ventilation, When the wind speed is increased, the natural ventilation will have a limited effect on the depth. The natural ventilation will be mainly used to suppress the ammonia pollution in the construction. After the curtain wall is closed, the mechanical ventilation can be used and the wind deflector can be used to improve the effect of mechanical ventilation.