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Added Mass Effects on a Francis Turbine Runner with Attached Blade Cavitation

1
WinGD Ltd., Schützenstrasse 1-3, 8401 Winterthur, Switzerland
2
Department of Fluid Mechanics, Universitat Politècnica de Catalunya, Av. Diagonal 647, 08028 Barcelona, Spain
*
Author to whom correspondence should be addressed.
Fluids 2019, 4(2), 107; https://doi.org/10.3390/fluids4020107
Received: 18 May 2019 / Revised: 4 June 2019 / Accepted: 5 June 2019 / Published: 11 June 2019
(This article belongs to the Special Issue Turbomachinery Flow Analysis)
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Abstract

To have a safe structural design, an analysis of the dynamic behavior of a Francis turbine runner with consideration of the added mass effects of surrounding water is necessary during design phase. Both in design and at off-design operations, large-scale forms of attached cavitation may appear on runner blades and can change the added mass effects of the surrounding fluid in relation to a single water domain. Consequently, a numerical investigation of the modal response of a Francis runner has been carried out by reproducing the presence of various sizes of leading edge cavitation (LEC) and trailing edge cavitation (TEC). The fluid–structure interaction problem has been solved by means of an acoustic-structural coupling method. The calculated added mass effects with cavitation have been compared with those corresponding to the pure water condition without cavitation. Firstly, a single blade has been investigated to evaluate the level of significance for the proposed cavity shapes and dimensions. Afterwards, based on the results obtained, the complete runner structure has been considered, factoring in similar cavity shapes and locations. The results prove that significant added mass effects are induced on the entire runner by the attached cavitation that increase the natural frequencies of the first modes. Moreover, the added mass effects increase with cavity size and amplitude of blade deformation below the cavity. View Full-Text
Keywords: added mass effect; attached cavitation; Francis runner; fluid-structure coupling; frequency reduction ratio; blade deformation added mass effect; attached cavitation; Francis runner; fluid-structure coupling; frequency reduction ratio; blade deformation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Huang, X.; Escaler, X. Added Mass Effects on a Francis Turbine Runner with Attached Blade Cavitation. Fluids 2019, 4, 107.

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