The Optimal Design Of The Volute Of The 50AY35 Oil Pump

Centrifugal pump is a kind of indispensable product transporting special viscous liquids, with relatively small volume and high speed, has been widely used in industrial and agriculture production and petrochemical process. The annual power consumed by such pumps accounted for more than 20% of total electricity, a tremendous amount of energy, and its efficiency is not high. Due to the rotation, bending and strong three-dimension of the internal volute flow, the flow pattern becomes complex and flow loss is about 25 to 50 percent of the overall wastage of the pump, which has enormous saving potential.The research object of this paper is 50AY35 centrifugal pump, which is from Wu Yang heat and power plant. Conducting the modeling of the volute and impeller with UG firstly, then assumed to be an ideal fluid, which belongs to the three dimensional viscous incompressible flow, using fluid software FLUENT simulate unsteady flow inside the machine body. Under the RNG k-e turbulent model, solving the Navier-Stokes equations through amending calculation method SIMPLEC and SMM sliding mesh technology, and reasonably analyzing the velocity vector and pressure variation of the flow in the designing case.Finally, adopting a new algorithm to optimize the geometry size of the volute,improving the hydraulic performance and internal flow pattern, so as to achieve the goal of efficiency increasing and energy saving. This will have an essential influence on the development of the national economy, resource conservation and environmental protection.