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针对具有顶部自然排烟口的高大空间建筑火灾,在1/10的缩尺模型试验数据与全尺寸FDS模拟计算结果相吻合的基础上,提出用送风气幕代替多风口送风,研究顶部自然排烟口开口率、风机风速以及火源功率对自然排烟、机械排烟和机械送风三种防排烟模式的影响。对比这三种模式下测点的最高温度,并采用排烟质流量率对排烟口排烟效率进行评价。研究结果表明:各模式下达到最佳排烟效果时各参数设置明显不同。在机械排烟模式下,火源功率为4.5 MW、开口率为0.3%、风速为-3 m/s时排烟效果最佳;在机械送风模式下,火源功率为4.5 MW、开口率为0.3%、风速为6m/s时排烟效果最佳。
Aiming at the large-scale building fire with the top natural exhaust vent, based on the 1/10 scale model test data and the full-scale FDS simulation result, it is proposed to use the air supply air curtain instead of the multi-tuyere air supply to study the top natural Exhaust port opening rate, fan speed and source of fire on natural smoke exhaust, mechanical exhaust and mechanical ventilation three kinds of smoke control mode. Comparing the maximum temperature of the measuring points under these three modes, the smoke exhaust flow rate was evaluated by the exhaust smoke mass flow rate. The results show that the parameters of each parameter are obviously different when the best smoke exhaust effect is achieved in each mode. In mechanical exhaust mode, the power of the ignition source is 4.5 MW and the aperture ratio is 0.3%. When the wind speed is -3 m / s, the smoke exhaust effect is the best. In the mechanical ventilation mode, the ignition source power is 4.5 MW and the aperture ratio 0.3%, when the wind speed is 6m / s, the smoke exhaust effect is the best.