Numerical Simulation With The Inlet And Outlet Channels Of Two-way Tubular Pumping Station

With the rapid development of modern computer software and hardware technology, CFD have been achieved the considerable development and wide application in the area of fluid machinery research and three dimensional turbulence field.Based on the CFD technology, not only a numerical simulation with the inlet and outlet channels of two-way tubular pumping station of bulb is performed in this paper, but also an analysis of channels flow condition and a prediction about flow regularities inside are proposed. The results showed that this technology is effective in reducing the water head loss and optimizing the pumping station design. An important theory significance and practical value in improving the efficiency and stability have been achieved by using this technology.A new scheme was developed in this paper on the basis of N-S equation and standard k-s model. Near-wall flow was resolved by wall function with the application of sliding net model, velocity inlet, free outlet boundary, non-slip velocity condition; control equations were dealt with by means of finite volume scheme, first-order upwind scheme, implicit model and made a discretization using SIMPLEC algorithm. Thus, the following results can be achieved with the numerical simulation on three dimensional steady incompressible turbulent flow fields.1. When bulb placed before, according to the operating conditions of different contraction angle, the water head loss of inlet channel whether guide vane was distorted or not, the velocity distribution and equivalent value line map of the lengthways section channel, the velocity equivalent value line map of outlet channel section can be obtained altogether.2. When bulb placed behind, according to the operating conditions of different expanding angle, the water head loss of outlet channel on condition that non-rotation flow inlet or rotation flow inlet, the velocity distribution and equivalent value line map of the lengthways section channel, the outlet velocity equivalent value line map of expanding section can be obtained altogether.3. The relation curve between the pressure loss of outlet channel and guide vane cone angle was acquired.4. The guide vane affects the inlet and outlet channel flow field on the basis of different contraction angle. The non-rotation flow or rotation flow affects the outlet channel flow field on the basis of different expanding angle. The guide vane cone angle affects the inlet and outlet channels flow field. An analysis was made about these influences, and regularities were summarized to propose the reasonable suggestions of the pumping station design optimization.