Study On Comparison Of Pump Models And Hydraulic Design Of Inlet And Out Conduits In Tonglu Canal Pump Station

Large-scale low-lift pumping stations are widely used in drainage and irrigation projects in plain areas.They are important water conservancy projects and play an important role in water resource allocation,water environment improvement,urban flood control,and agricultural irrigation.For large-scale low-lift pumping stations,the hydraulic performance of the pump device is very important,the quality of the hydraulic performance is closely related to the selection of hydraulic models and the hydraulic design of inlet and outlet conduits.Taking Tonglu Canal Pumping Station as an example,this paper research the hydraulic model optimization of large-scale low-lift pumping stations and the hydraulic design of inlet and outlet conduits,also conducts pump device model tests based on the aforementioned research results.The main research contents and conclusions of this paper include the following points:(1)Since different hydraulic models have a greater impact on the external characteristics of the pumping device,in order to ensure the efficient and stable operation of the Tonglu Canal Pumping Station,this paper adopts the selection coefficient method to compare and select the TJ04-ZL-07 hydraulic model and TJ04-ZL-23 hydraulic model.The results show that the TJ04-ZL-07 hydraulic model has higher device efficiency and excellent cavitation performance under the design head conditions,it determines as the preferred hydraulic model.(2)In order to improve the hydraulic performance of the inlet conduit and meet the space requirements of the motor unit,the width-length dimension and the width-length ratio of the shaft are selected as the main parameters to form a design scheme for numerical simulation.The results show that when the shaft length is 3.43 D,the shaft width is 1.64 D and the shaft width-length ratio is 0.46 to 0.48,the water flow in the inlet conduit is fine,the hydraulic performance is excellent,and the shaft space is wide,it determines as the preferred shaft section control size.(3)In order to improve the hydraulic performance of the traditional straight pipe outlet conduit and reduce the total amount of civil engineering,the bottom of the outlet conduit is the main research entry point,9 groups of design schemes are formed and the full conduit numerical simulation is carried out.The results show that when the bottom upturn angle is 1.5°,the hydraulic performance of the outlet conduit has obvious advantages,but the wing wall of the outlet pool is higher;when the bottom upturn angle is 3.5°,the outlet conduit can minimize the height of the outlet pool wing wall while sacrificing a small amount of device efficiency,it determines as the preferred outlet flow conduit design form.(4)Carry out the model test of the Tonglu Canal shaft tubular pump device.The test results show that the pump device has excellent energy performance and cavitation performance,good runaway characteristics,and pressure pulsation within a reasonable range;The TJ04-ZL-07 hydraulic model fits well with the shaft tubular pump device,and the hydraulic design of the inlet and outlet conduits is reasonable.The research results of this paper provide a theoretical basis for the design and selection of low-lift pumping stations,and have important reference significance and engineering application value for improving the hydraulic design level of the shaft inlet conduit and the straight pipe outlet conduit.