第四部門：流体力学（A）

[S04A-05] Effect of Manhole Cover on Flow Characteristics in A Sewer Pipe due to Pump Shutoff

*Hao Zhang¹, Kenji Kawaike², Tomohiro Kyouzawa¹, Yuu Satou¹, Junqiang Xia³ (1. Kochi University, 2. Kyoto University, 3. Wuhan University)

キーワード：Manhole, Sewer pipe flow, Pump shutoff

Experiments are conducted to study the effects of manhole covers on the flow characteristics in a sewer pipe due to the sudden shutoff of a pump. Three kinds of manhole cover conditions, i.e. a closed-type cover, a cover with an air vent and no cover are investigated. According to the experiments, the manhole cover conditions exert significant impacts on the flow velocities and pressure distributions in the sewer pipe. The temporal changes of the flow in a surcharged condition is much rapid compared with that in an open channel condition. The manhole serves as a surge tank in the system and the characteristics of the sewer pipe flow in the upstream of the manhole are quite different from those in the downstream of the manhole.