Study of flow field and vibration characteristics of supersonic centrifugal impellers based on fluid-structure interaction
International Journal of Numerical Methods for Heat & Fluid Flow
ISSN: 0961-5539
Article publication date: 27 March 2023
Issue publication date: 19 May 2023
Abstract
Purpose
There are three purposes in this paper: to verify the importance of bi-directional fluid-structure interaction algorithm for centrifugal impeller designs; to study the relationship between the flow inside the impeller and the vibration of the blade; study the influence of material properties on flow field and vibration of centrifugal blades.
Design/methodology/approach
First, a bi-directional fluid-structure coupling finite element numerical model of the supersonic semi-open centrifugal impeller is established based on the Workbench platform. Then, the calculation results of impeller polytropic efficiency and stage total pressure ratio are compared with the experimental results from the available literature. Finally, the flow field and vibrational characteristics of 17-4PH (PHB), aluminum alloy (AAL) and carbon fiber-reinforced plastic (CFP) blades are compared under different operating conditions.
Findings
The results show that the flow fields performance and blade vibration influence each other. The flow fields performance and vibration resistance of CFP blades are higher than those of 17-4PH (PHB) and aluminum alloy (AAL) blades. At the design speed, compared with the PHB blades and AAL blades, the CFP blades deformation is reduced by 34.5% and 9%, the stress is reduced by 69.6% and 20% and the impeller pressure ratio is increased by 0.8% and 0.14%, respectively.
Originality/value
The importance of fluid-structure interaction to the aerodynamic and structural design of centrifugal impeller is revealed, and the superiority over composite materials in the application of centrifugal impeller is verified.
Keywords
Acknowledgements
The authors are grateful for the financial support from the National Natural Science Foundation of China (Grant No. U1708254).
Declaration of interests: All authors declare that there is no conflict of interest.
Citation
Li, H. and Zhang, Y. (2023), "Study of flow field and vibration characteristics of supersonic centrifugal impellers based on fluid-structure interaction", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 33 No. 7, pp. 2509-2532. https://doi.org/10.1108/HFF-11-2022-0628
Publisher
:Emerald Publishing Limited
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