“当量流通面积”流量分配法在加压送风量计算中的应用
Application of flow distribution method of equivalent circulation area to calculation of pressurized air supply
摘要：
并联、串联气流的流动规律为：串联气流不论流经多少道门洞或缝隙，其阻力可用当量流通面积来表示；并联气流通路上的压降相等，各通路流量之比与其当量流通面积成正比，即，送入正压间的总流量是按并联气流当量流通面积来分配的。因此，只要得出某一并联通路的流量，防烟系统其他各通路的流量（包括总流量）就可求得。根据防烟技术条件的规定，为抵御烟气入侵，通过内走道与前室（或合用前室）之间的防火门门洞处所必须保证的风速为07～12 m/s，防火门开启面积是确定的，因此便可得出该并联通路的流量，从而可建立各子项的数学模型，为优化防烟方案提供新的手段。
Abstract：
The flow pattern of parallel and series airstream is described as follows: regardless of the number of openings and gaps passing by series airstream, the resistance can be represented by the equivalent circulation area; the pressure drop of parallel airstreams is equal, the flow ratio of paths is proportional to the ratio of equivalent circulation area, i.e. the total flow into the positive pressure space is distributed by the equivalent circulation area of parallel airstreams. Therefore if the flow rate of any path in parallel airstream is known, the flow of other paths(including the total flow) in a smoke control system can be calculated. According to the technical provisions of smoke control system, the velocity of the airstream passing the fire door which between the hallway and its antechamber (or common antechamber)must not less than 0.7 to 1.2 m/s to resist invasion of the smoke, the open area of the fire door is determined according to the design value, so smoke flow of the parallel airstream can be calculated. Then, the mathematical model of Sub-items can be developed, providing new approaches for optimization of smoke control scheme.
Keywords:parallel connection, series connection, equivalent circulation area, flow distribution, effective utilization ratio of air flow