Research On The Inlet Hydraulic Characteristics Of Urban Drainage Pumping Stations

In the thesis, a general study on inlet hydraulic characteristics(IHC) of representative urban drainage pumping station which layout is symmetrical was made.The main contents are listed as follow :1. The IHCs relate closely to the operating of pump.Based on the summary about the approach on IHC of pumping stations,a viewpoint that it is necessary to regulate the flow pattern in the fore-bay and the flow-regulating measures must be helpful to reduce the sedimenting was put forward.It is proposed that the diversion plate is suited to regulate the flow.2. The CFD (Computational Fluid Dynamics) numerical simulation based on VOF method and Realizable k-e turbulence model was used to simulate the high-turbulent free surface flow.The comparing between the simulation result and the experiment data for two cases indicates that the CFD numerical simulation is applicable.3. With hydrodynamics, experiment and numerical simulation, the characteristics of the flow pattern in the fore-bay ,ie.backflow due to bump the back-wall and the main flow along the middle passage,are analyzed.Meanwhile,the disadvantage on the operating of pump due to bad flow pattern was also analyzed.4. Based on numerical simulation and qualitative analysis,the scheme for experiment about the flow-regulating technology with the diversion plate was determined.The effects on flow-regulating in different position, different inclining angle and the clearance between the under edge of diversion plate and the bottom of fore-bay were analyzed.The optimal scheme was suggested.