Flow Channel Optimization And Hydraulic Characteristics On Pump Sets Of Xifei Pumping Station

Xifei river pumping station belongs to the Xifei River treatment project of the Huaihe River in Anhui province. The pumping station is used for drainage and diversion, six pumps were installed in it. The pump is 2900ZLQ-100 (the impeller diameter.is.2.9m) vertical type of adjustable axial-flow pump, the pump matches TL2400-44/3250 synchronous electrical machine, with capacity of 2400kw.The net lift range of drainage pumping station is 0～5.55m,the design discharge is 180m3/s; the net lift of diversion pumping station ranges from 0～5.0m,with the design discharge of 150m3/s. This pump station adopts the X type bidirectional inlet and outlet channel, and the preliminary selection is Tianjin water diversion on the test of TJ04-ZL-06 hydraulic model. In correspond to the requirements this research focuses on Xifei river pumping station hydraulic model and controlling the size of it.By CFD numerical simulation, we complete inlet and outlet conduit optimization design; Through the model test of pumping equipment, we get to know whether the pump can operate safely, stably and efficiently in the operating range of the pump station.This research takes the method of 3D turbulent flow numerical simulation to test the flow patterns of the inlet and outlet conduits, which combining control equations of numerical simulation include continuity equation and Reynolds Navier-Stokes equation with standard turbulent model. The Finite-Volume-Method is utilized for discretization of the control equations. SIMPLE algorithm is applied to pressure-velocity coupling based on the staggered grid system. Based on the methods mentioned above, an optimum design is applied for inlet and outlet conduits of Xifei river pumping station. In addition, this paper also analyzed the internal flow field of the channel. The optimized inlet flow channel can achieve the orderly flow of water flow and uniform contraction; The water outlet channel can achieve the orderly and smoothly, both meet the requirements of hydraulic design.In the absence of cavitation condition, six blade angles are tested on the TJ04-ZL-06 hydraulic model:-6°、-4°、-2°、0°、+2°、+4°. By the model test, the dynamic characteristics of the pump are obtained, and the comprehensive characteristic curve of the model and the prototype pump device is drawn according to the test results of the dynamic characteristics. The pump at different blade angles were measured under the condition of NPSH, reach decisions that the change curve of the cavitation performance results of different angle of operation and the blade angle of critical NPSH were obtained. Opening the auxiliary pump, forming pump device stable reverse head, pump reversal, the measured blade angle corresponding to different head runaway speed, drawing out the pump device runaway characteristic curve. The experimental results show that Xifei river pump system can better meet the flow requirements, the device efficiency index can reach a higher level, in the whole operating range without cavitation damage, and the runaway characteristics meet the specification requirements.This paper’s research on into-outlet conduit optimization design CFD numerical calculation and pump device model will not only provide Xifei river pumping station project with constructive guidance. At the same time, this paper also provides a good reference for the future construction of China’s large pumping station.