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An Experimental Analysis of the Structural Response of Flexible Lightweight Hydrofoils in Cavitating Flow

[+] Author and Article Information
alexandra Lelong

PhD, Department of Mechanical Engineering, Naval Academy Research Institute, BCRM Brest, ECOLE NAVALE - IRENAV CC 600, 29240 BREST Cedex 9 FRANCE
alelong.al@gmail.com

Pierre Guiffant

MS Graduate, Department of Mechanical Engineering, Naval Academy Research Institute, BCRM Brest, ECOLE NAVALE - IRENAV CC 600, 29240 BREST Cedex 9 FRANCE
pierre.guiffant29@gmail.com

Jacques Andre Astolfi

Professor, Department of Mechanical Engineering, Naval Academy Research Institute, BCRM Brest, ECOLE NAVALE - IRENAV CC 600, 29240 BREST Cedex 9 FRANCE
jacques-andre.astolfi@ecole-navale.fr

1Corresponding author.

ASME doi:10.1115/1.4037990 History: Received December 07, 2016; Revised September 06, 2017

Abstract

The paper presents an original experimental study concerning the structural response of a flexible lightweight hydrofoil undergoing various flow conditions including partial cavitating flow. It is based on the analysis of the static deformation, the vibrations, the strains and the stresses of a Polyacetal NACA0015 cantilevered hydrofoil in a hydrodynamic tunnel, at Reynolds numbers ranging from 3:105 to 6:105. A specific distance measurement laser device was developed to measure the static deformation of the hydrofoil. The vibration response was measured by means of two laser vibrometers in order to identify the structural modal response. The strains and stresses were obtained from integrated strain gauges embedded in the foil close to the root section. A high speed camera was used in order to analyze unsteady features of the cavitating flow. The paper presents the experimental setup and several results in both non-cavitating and cavitating flow that should be very useful for numerical developments of FSI in heavy fluid. Several observations are reported in the paper showing the strong coupling between the fluid and the structure. Particularly a frequency lock-in of the cavity frequency to the first bending mode is clearly observed for a narrow band of cavitation numbers.

Copyright (c) 2017 by ASME
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