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中文摘要：
改变流量建立喷淋模型，利用Tamanini公式对火源功率进行修正，通过数值模拟，研究了不同流量时，喷淋作用区火源功率及烟气层高度的变化情况．进而分析了水喷淋与火源功率衰减耦合作用对烟气沉降特性的影响．同时，对不同的火源条件，比较烟气层高度随时间的变化，探讨了引起烟气沉降的主导因素．结果表明，增加喷淋流量，火源功率衰减幅度减小，喷淋对烟气层的沉降效应增强，烟气沉降区扩大，烟气层高度降低．烟气沉降是喷淋沉降效应和浮力效应协同作用的结果，沉降出现后，烟气层高度随火源功率衰减而降低．
英文摘要：
Varying the flow rate of sprinkler developed the spray model. The HRR of the fire source was modified by the Tamanini formula. Numerical simulation was performed to investigate the layer height of hot smoke and the development of the HRR under sprinkler spray. Based on the simulation result, the effect of the spray and the fire source on the descent characteristics of the hot smoke was analyzed. The driving force of the smoke descent was concluded by comparing the developments of the layer height under different fire source conditions. The study shows that increasing the flow of the sprinkler, the decay extent of the HRR decreases, and that the descent region extends and the layer height decreases with the enhancement of the descent effect on the hot smoke of the spray. The smoke descent results from the synergistic effect of the descent effect of the spray and the buoyant effect of the smoke layer. The layer height decreases with the decrease of the HRR after the occurrence of smoke descent arising.
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