Autor: |
Jacques-André Astolfi |
Rok vydání: |
2021 |
Předmět: |
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Zdroj: |
Flinovia—Flow Induced Noise and Vibration Issues and Aspects-III ISBN: 9783030648060 |
DOI: |
10.1007/978-3-030-64807-7_7 |
Popis: |
Experiments providing high fidelity experimental data are strongly required for physical analysis and numerical validation regarding of modelling and computation of Fluid Induced Vibration for hydrodynamics applications. This requires the development of advanced experiments and methods in very well controlled configurations as in hydrodynamic tunnels to analyse both the structure response and the flow dynamics. The paper presents original Fluid Induced Vibration experiments performed in the hydrodynamic cavitation tunnel of the French Naval Academy along the past few years. The experiments are generally conducted at a relative high Reynolds numbers typically ranging from about one hundred thousand to more than one million. The experiments are conducted on relatively small scale elastic or rigid lifting surfaces or elastic flat plates undergoing various flow conditions as turbulent boundary layer, Laminar Separation Bubble inducing transition, vortex shedding and cavitation. The structural response is analysed through local strains and stresses and vibration measurements for modal analysis. The deformed shape of the structure is obtained from a specific distance laser measurement device. Local stresses are obtained from strain gauges embedded in the structure. The vibration modal response is analysed by means of mono-point and scanning non contact laser Doppler vibrometers. The flow dynamics is examined through instantaneous wall-pressure field measurements using arrays of pressure transducers and through instantaneous velocity field measurement based on Time Resolved-Particle Image Velocimetry measurements and data-driven modal decompositions as Proper Orthogonal Decomposition. High speed cameras and image processing can be also used to analyse both the structure and flow dynamics particularly in cavitating flow. The paper presents the general experimental set-up and methods. Selected results are reported and briefly discussed. |
Databáze: |
OpenAIRE |
Externí odkaz: |
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