Abstract
Axial-flow pump with a two-way passage has been widely employed in irrigation and drainage projects. Because of the shape of the two-way inlet passage, the impeller easily induces vibration due to unstable turbulent flow. This vibration results in structural cracks and even hinders the safe operation of the pump. Deformation and stress distributions in the impeller were calculated using two-way coupled fluid–structure interaction simulations, and a quantitative analysis of blade deformation and stress is carried out to determine the structure critical region. The results show that the values of deformation and stress significantly decrease with an increasing flow rate and a decreasing head, and the maximum total deformation can be found in the impeller rim, while the maximum equivalent stress can be obtained near the impeller hub. The total deformations in the blade rim decrease from blade leading edge to trailing edge, and the equivalent stress in the blade hub initially increases and then declines, and in the end, it rapidly increases from the blade outlet to inlet. These results reveal the deformation and stress in the impeller to ensure reliability and specific theoretical guidance for the structural optimization design of a pump device.
Highlights
An axial-flow pump device with a two-way passage consists of an impeller, a guide vane, a two-way inlet passage, and a two-way outlet passage
The calculated heads with and without Fluid–structure interaction (FSI) were both obtained from the average values of unsteady FSI and computational fluid dynamics (CFD) results separately, which have the same initial time and total calculation time
A coupled solution of the flow field and structural response of the impeller was established using a twoway coupling method to study the distribution of stress and deformation in the impeller and quantitatively analyze that on the blade along the wireframe paths for different flow rates
Summary
An axial-flow pump device with a two-way passage consists of an impeller, a guide vane, a two-way inlet passage, and a two-way outlet passage. The bad flow state in the inlet passage will lead to flow separation and, in turn, a vortex in the impeller, which may cause impeller vibration (deformation and stress problems). These problems will lead to degradation of the pump device performance, hindering its safe operation. Determining the stress distribution and deformation in the impeller to ensure the reliability of the pump device requires a solution for the internal flow field of the pump and an analysis of the structural mechanics of the impeller
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
