Study On Dynamics Of High-pressure Low-noise Constant Flow Centrifugal Pump

Centrifugal pump which is widely applied in water supply and drainage,agricultural engineering, solid particles of liquid transportation engineering, organic chemistry industry, aerospace and maritime engineering, vehicle engineering and energy projects such as the departments of national economic construction. In the paper, it is studied that the interior flow simulation and cavitations in pump with the high-pressure low noise constant flow kinetics of centrifugal pump as the research objects, which provide theoretical support for the optimization design of the centrifugal pump and have actual application to engineering design.The paper introduces the centrifugal pump design status, Computational Fluid Dynamics, and the computational fluid dynamics methods which are applied in pump internal flow. According to structure parameters of one certain type high-pressure low noise flow pump, the modeling of pump's internal three-dimensional flow by Pro/Engineer, the dividing unstructured meshes to the model by GAMBIT, and the numerical calculating by FLUENT, are expatiated. The result of simulation and experiment is in good agreement, which verify the reliability of the simulation. Analyzing the simulation result, we can deeply understanding of the flow distribution in centrifugal pump. In the dynamics simulation, the standard k ?εmodel and Mixture model are used to simulate the flow field and cavitation phenomenon. According to the simulation at low flow condition, design flow condition and high flow condition, we can get the centrifugal pump performance curve which agrees with the experimental data. And simulating the cavitation phenomenon base on flow field simulation, we find the cavitations location, which confirmed that the cavitation simulation in the centrifugal pump phenomenon scientific research is reliable.According to simulating of the internal flow centrifugal pump, the flow condition can be showed, such as the distribution of pressure and velocity at centrifugal pump volute, blades and impeller,and the cavitaton location. This study is great important in theory and engineering application, and offer exhaustive data for the optimization design of centrifugal pump.