A high-performance smoke exhaust system is vital for maintaining a tenable environment during fire accidents evacuation. This study proposes a novel vortex flow driven smoke exhaust system to delay the smoke filling process during the atrium fire accident. The complex fluid movement and combustion reactions were predicted using Fire Dynamics Simulator, and the predicted smoke filling process was identified by the least-square method. Good agreements between numerical predictions and experimental measurements for vertical temperature, tangential velocity profile and smoke interface height were achieved. The numerical outcomes revealed that the amount of fresh air supplied, heat release rate and exhaust fan's rate determined the smoke interface's final height. A parametric study was also carried out to investigate the dominating factor in maintaining a stable vortex flow to maximize the smoke exhaust efficiency. Numerical results showed that the vortex flow smoke exhaust system could slow down the smoke filling, and the stability of the swirling fire is crucial for the system's performance.

高性能排烟系统对于在火灾事故疏散期间保持稳定的环境至关重要。本研究提出了一种新型涡流驱动排烟系统，以延迟中庭火灾事故中的烟雾填充过程。使用Fire Dynamics Simulator预测复杂的流体运动和燃烧反应，并通过最小二乘法识别预测的烟雾填充过程。在垂直温度、切向速度剖面和烟雾界面高度的数值预测和实验测量之间取得了良好的一致性。数值结果表明，新风供应量、热释放率和排风扇率决定了烟气界面的最终高度。还进行了参数研究以研究维持稳定涡流以最大化排烟效率的主要因素。数值结果表明，涡流排烟系统可以减缓烟雾的填充，旋流火的稳定性对系统的性能至关重要。