管路・開水路流れ境界面の発生する管水路のサージング現象

Abstract

This paper deals with the surging phenomena with the propagation of multiple interfaces between open channel free surface flows and pressurized pipe flows, which can be seen due to the rapid change of flow discharge in the sewer network system, the tailrace tunnel of hydropower plants, etc.The circular pipe with multiple vertical shafts is used as the experimental set-up to investigate the fundamental characteristics of phenomena.The temporal and spatial variations of the pressure and depth in the pipe after the instantaneous interception of discharge are measured under some hydraulic conditions.The maximum elevetion of water surface at vertical shafts is related to the hydraulic variables such as the discharge and the position of vertical shafts.It is tried to reproduce the phenomena numerically by means of the simulation model proposed by authors. The numerical results are compared with the laboratory tests to make sure the applicability of the model.