采用瞬间流法的自循环与双立管系统排水能力研究

Study on Drainage Capacity of Self-recirculation and Double Stack Systems with Instantaneous Flow

在34层高度的试验塔上,采用瞬间流发生器排水,考察自循环排水系统和双立管(主副通气+环形通气)排水系统中流量与压力的关系,从而得出各系统在瞬间流排水时所对应的排水能力。结果表明:瞬间流排水时,对于自循环系统和双立管(主副通气+环形通气)系统,系统内最大负压基本发生在系统顶层,最大正压基本出现在中间层。管径布置方式相同时,各系统瞬间流测试的排水能力为:主副通气+环形通气﹥自循环环形通气﹥自循环专用通气,且均小于现行规范值;采用同一系统不同排水立管管径时,排水能力为:DN110×DN110>DN125×DN110。

The instantaneous flow generator was used to drain away water from a 34-floor tower.The relationship between the pressure and flow rate in self-recirculation drainage system and double stack drainage system( main and secondary loop venting) was investigated,and the corresponding drainage capacity of the systems using instantaneous flow was confirmed. The results showed that when using instantaneous flow,the largest negative pressure occurred in the top floor of self-recirculation drainage system and double stack drainage system,and the maximum positive pressure occurred in the middle floor. With the same arrangement of diameter,the drainage capacities of the systems were as follows: main and secondary loop venting > self-circulation loop venting > self-circulation specific venting. All values were less than the value of the current code. When the same system was used at different diameters,the drainage capacity was: DN110 × DN110 > DN125 × DN110.