高层建筑中利用竖井进行排烟的可行性分析

FEASIBILITY ANALYSIS OF NATURAL VENTILATION USING SMOKING SHAFT IN HIGH-RISE BUILDINGS

摘要: 从理论和模拟两方面论述了利用竖井进行排烟的可行性。研究结果表明,影响竖井排烟效果的主要因素是进入竖井的烟气温度和外部力(包括外界空气的热阻力和竖井壁的粘性力),并且两者对烟气流动的作用相反,前者加快烟气运动,后者减缓烟气运动。最后提出,通过对竖井的合理设计,可以增大热烟气的动压,达到理想的排烟效果。

Abstract: Theoretical and numerical studies are performed to analyze a smoke extraction system using smoking shaft.Results show that the most important factors which influence the efficiency of smoke extraction are the smoke temperature,viscosity along the smoking shaft and outside thermal resistance.The smoke movement is accelerated by smoke temperature,but detained by the viscosity and thermal resistance.Finally,it is shown that with proper design of the smoking shaft,dynamic smoke pressure can be enhanced and the efficiency of smoke ventilation improved.