Based On Fluid-solid Coupling Axial Flow Pump Impeller Performance Prediction

The axial flow pump plays an important role in the modern industry; the impeller is the key parts of axial flow pump, its performance deciding the axial flow pump's efficiency. This paper uses the fluid-solid coupling method compute the axial flow pump's impeller. According to the hydromechanics and the elasticity theory established axial flow pump's fluid - solid coupling finite element equation. In the computational process uses the k ?εequation model, and analysis the solution question in the process of fluid-solid coupling.This paper uses the UG software, establishes axial flow pump's impeller model and fluid model, transfer the model data into the ADINA software. Carries on the solution establishment to impeller's structure in the ADINA-structure module and produce the solid solution document; Carries on the solution establishment to the fluid part in the ADINA-fluid module and produce fluid solution document, finally put the coupling computation in the ADINA-FSI module.Compute the impeller's three working conditions, obtains the impeller internal stress and the strain on the different operating conditions, the fluid velocity and the pressure distribution situation. We can draw the important conclusion from the results of computation and analysis:1. the impeller's biggest stress and strain occurs in root; which connects the blade and the wheel hub, the stress becomes more smaller approaches the head of blade; the stress and strain increasing with the velocity increasing; so, when we design the impeller should pay attention to root areas. The most tremendous pressure gradient of fluid occurs in the impeller root areas, along with flow speed increased, the value of pressure and the front of blade's distortion also increased; cased the axial flow pump blade's vibration. Working for a long time, it can easily produce the fatigue failure in the impeller root, and destroy the axial flow pump's normal work; therefore, we should pay more attention to the impeller's intensity.2. There have small eddy and backflow appears nearby the blade, destroy the internal normal flowing condition, which cases the axial flow pump's efficiency become low; so we should pay attention to the selection the wing section in the process of design the axial flow pump, reduces the backflow phenomenon occurrence, raises the axial flow pump's efficiency.We can obtain the impeller's interior actual flow situation and the impeller internal stress distribution due to axial flow fluid-solid coupling numerical simulation. At the same time, analysis the fluid-solid coupling under different working conditions, it has provided certain help and the reference for the later axial flow pump impeller's design.