Numerical Investigation Of Three-Dimension Turbulent Flow Fields In A Centrifugal Pump

The centrifugal pump is playing a very important role in every department of national economy and daily life. In this paper the numerical investigation on three-dimensional steady and unsteady rotor-stator interaction flow fields in a centrifugal pump were performed. The following aspects were studied mainly.The resolution methods and treatment technology of three-dimensional entity's modeling of the through-flow components of the centrifugal pump based on MDT were introduced in detail in this paper and the three-dimensional entity's modeling software based on MDT was utilized to create the three-dimensional entity of the through flow components of the pump include inlet tube, impeller, volute and diffuser.According to the structure characteristic of the through-flow components of the centrifugal pump and adopting multi-block grids generating technique further, the complicated centrifugal pump structure topology was divided into several simple blocks, and then the grids generating was achieved in these blocks of the centrifugal pump by adopting a unstructured grid generating software which has a good and strong adaptability to the complicated geometry. It is available to carry out numerical simulation and fluid dynamic analysis further.Based on Frozen-Rotor Approach and Rotor-Stator Approach, the numerical simulation was carried out in the centrifugal pump and the numerical results showed that the flow in the impeller and volute of centrifugal pump is periodically unsteady. Due to the interaction between impeller and volute the flow is characterized by pressure fluctuations and it is the strongest at impeller outlet and at the vicinity of the tongue. The unsteady pressure fluctuations are also one of the most important reasons to induce vibration and noise. Secondly, the flow field of the volute is characteristic of the vortex flow, and the vortex flow presents very complicated developing process which is creating, increasing and dissipating every now and then. All these lead to very large flow loss in the volute.