在34层高的试验塔上,采用定流量测试法,分别测试PVC-U普通单立管系统、PVCU特殊配件单立管系统(光壁管+旋流三通)以及PVC-U特殊单立管系统(螺旋管+旋流三通)管顶通气流量与系统最大负压。结合通气流量随排水量以及系统最大负压的变化情况进一步分析单立管系统管顶通气流量的影响因素。结果表明:系统最大负压是影响通气流量的主要因素,其主要受水膜气水界面切应力和自由水滴的共同作用;在管顶通气条件相同的情况下,通气流量的大小是系统最大负压和水舌阻力共同作用的结果。 In the 34-storey test tower, the constant flow test method was used to test the PVC-U common single-stand pipe system, PVCU special fittings single-stand pipe system (light-walled pipe + swirl tee) and PVC-U special single stand Tube system (spiral + swirl tee) Tube top vent flow and system maximum negative pressure. Combined with the change of aeration flow rate with the displacement and the maximum negative pressure of the system, the influencing factors of tube ventilation flow in single-stand pipe system were further analyzed. The results show that the maximum negative pressure of the system is the main factor affecting the aeration flow, which is mainly affected by the shear stress at the water-air interface and the free water droplets. Under the same aeration condition, the aeration flow rate is the largest negative Pressure and water tongue resistance result together.