Study on Fatigue Characteristics of Axial-Flow Pump Based on Two-Way Fluid–Structure Coupling

Yalei Bai () and Donglei Wu
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Yalei Bai: School of Aeronautics, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
Donglei Wu: School of Energy and Electrical Engineering, Ho Hai University, Nanjing 210016, China

Energies, 2022, vol. 15, issue 23, 1-18

Abstract: When an axial-flow pump is running, there is a very complex flow inside the runner. Based on the two-way fluid–structure coupling method, this paper simulated the forward and reverse operating conditions of an axial-flow pump and calculated the dynamic stress distribution on the blade surface. The stress load spectrum was loaded onto the blade, and fatigue characteristic analysis was carried out to obtain the fatigue life and damage of the blade. This research shows the following: under different working conditions, the dynamic stress is concentrated at the root of the blade, and its amplitude decreases with the increase in the flow rate; at the same time, the change in stress with time shows a periodic change law. Under the working conditions of the turbine, the main frequency is the rotational frequency, and the secondary frequency is composed of multipliers of the rotational frequency, which is obviously affected by the number of blades; the fatigue damage and stress distribution are consistent, and the damage is the most serious at the stress concentration point. The research results of this paper can provide theoretical guidance for the structural design and safe operation of axial-flow pumps.

Keywords: axial-flow pump; forward and reverse working conditions; two-way fluid–structure coupling; dynamic stress; fatigue characteristics (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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