The CFD simulation of the flow structure in the sewage pump

Abstract

Abstract The article presents the results of experimental and numerical tests of a sewage pump. As the object of the research, the single blade impeller was taken into consideration. The primary aim of the project was to investigate the flow structure in the submersible one channel sewage pump by means of the CFD methods. The numerical results were verified on the basis of comparison with experimental results obtained for the real pump. The numerical model was built with good accuracy to the reality and the flow was recognized, which allows creating a new explanation of the working process of the single blade impeller pumps and indicate the possibility of the improvement of the analyzed object. The head curve is characterized by smaller steepness than the results of the experimental tests and the difference, for the best point equals less than 10%. Transient simulation presented fluctuation of the head and power during the impeller rotation cycle. They are 4 m for head and mechanical power – 1 kW. The flow inside the pump was conscientiously analyzed. Pressure and velocity distribution as well as radial hydrodynamic force were presented in the paper.