Review of parameters influencing the structural response of a submerged body under cavitation conditions

9th International Symposium on Cavitation

Escaler, X.^1 ; De La Torre, O.^2 ; Farhat, M.^3

CDIF, Universitat Politècnica de Catalunya, Barcelona, Spain^1

Civil Engineering Department, National University of Ireland, Galway, Ireland^2

LMH, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland^3

关键词: Added mass effects;    Cavitation conditions;    Hydrodynamic conditions;    Natural frequencies and modes;    Partial cavitations;    Piezoelectric patch;    Structural response;    Submerged structures;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/656/1/012150/pdf
DOI  :  10.1088/1742-6596/656/1/012150

来源: IOP

【 摘 要 】

Submerged structures that operate under extreme flows are prone to suffer large scale cavitation attached to their surfaces. Under such conditions the added mass effects differ from the expected ones in pure liquids. Moreover, the existence of small gaps between the structure and surrounding bodies filled with fluid also influence the dynamic response. A series of experiments and numerical simulations have been carried out with a truncated NACA0009 hydrofoil mounted as a cantilever beam at the LMH-EPFL cavitation tunnel. The three first modes of vibration have been determined and analysed under various hydrodynamic conditions ranging from air and still water to partial cavitation and supercavitation. A remote nonintrusive excitation system with piezoelectric patches has been used for the experiments. The effects of the cavity properties and the lateral gap size on the natural frequencies and mode shapes have been determined. As a result, the significance of several parameters in the design of such structures is discussed.