烟雾是建筑火灾的主要杀手。它会降低能见度，并可能导致窒息死亡。本研究对中庭的烟气运动和烟气控制进行了数值研究。本研究旨在探讨屋顶排风机多点排烟对人体烟雾层高度和可维持性条件的影响。将研究补充空气速度和通过门和可操作窗户的自然补充空气入口的配置对中庭内烟雾运动的影响，以及对中庭内人员的影响。 此外，本研究还调查了排气扇布局对堵塞现象的影响。利用火灾动力学模拟器（FDS）软件版本6.1.2，在面积为400m2、高度为25m的三角形中庭内，采用t型方火对四个研究案例进行全尺寸三维数值模拟，最大热释放率为5MW，持续600秒。本文的研究参数是中庭内的能见度、温度和一氧化碳浓度。预计所有参数均位于距最高楼层1.8米处，以及中庭中心的平面图上。 结果表明，通过屋顶排风机排烟，可将烟层保持在离地面更高的水平，并对人体水平的可维持性条件有更好的影响，增加补风速度会对烟层高度产生不利影响，从而降低人体水平的能见度。最后，结果表明，增加中庭地板和补风口之间的距离会对烟层高度产生不利影响，并降低人体水平的可维持性条件。引文:2018年冬季会议，伊利诺伊州芝加哥，会议论文

Smoke is the major killer in the event of building fire. It reduces visibility and can cause fatalities by asphyxiation. This research presents a numerical study on smoke movement and smoke control for atrium. This research investigates the effect of exhausting smoke by multi point extraction through rooftop exhaust fans on smoke layer height and tenability conditions at human level. The effect of make-up air velocity and configuration of natural make up air inlets through doors and operable windows on smoke movement inside the atrium and the effect on human inside the atrium will be investigated. Also this research investigates the effect of exhaust fans layout on plug-holing phenomenon. Fire Dynamics Simulator (FDS) software version 6.1.2 is utilized to carry out full-scale three dimensional numerical simulation for four study cases in an atrium with triangular shape with area 400 m2 and 25m height using t-squared fire with maximum heat release rate of 5 MW for 600 seconds. Study parameters in this paper are visibility, temperature and carbon monoxide concentration inside the atrium. All parameters are predicted at 1.8 m from the highest floor and at a plan at the center of the atrium. Results show that exhausting the smoke through rooftop exhaust fans maintain the smoke layer at higher level from the ground and has better effect on tenability conditions at human level, increasing make up air velocity adversely affect smoke layer height which reduce visibility at human level. Finally, results show that increasing the distance between atrium floor and make-up air inlets adversely affect smoke layer height and reduce tenability conditions at human level.