Wave-attenuation efficiency of a floating distensible tube at different Keulegan–Carpenter numbers
Abstract A water-filled floating rubber tube is tested in a wave flume under regular waves of different steepness. The wave excited pressure bulges in the tube induce periodic oscillations of a forward-bent water column at its stern, which in turn activate a pneumatic power take-off system. The purp...
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Springer
2023-11-01
|
| Series: | SN Applied Sciences |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/s42452-023-05537-y |
| _version_ | 1797630021312970752 |
|---|---|
| author | António C. Mendes Francisco P. Braga |
| author_facet | António C. Mendes Francisco P. Braga |
| author_sort | António C. Mendes |
| collection | DOAJ |
| description | Abstract A water-filled floating rubber tube is tested in a wave flume under regular waves of different steepness. The wave excited pressure bulges in the tube induce periodic oscillations of a forward-bent water column at its stern, which in turn activate a pneumatic power take-off system. The purpose of the experiment is to better understand how the tube’s working modes contribute to the wave energy absorption and to quantify the power extracted from the incident waves. By applying Bernoulli’s equation for incompressible airflow, the water column free-surface displacement measurements deliver the pneumatic chamber pressure and the volume flow through the power take-off. Video captions help to reveal the interactions of the tube with the incident waves and further relate them to the system’s efficiency. Additionally, an energy balance enables the assessment of the internal friction and flow separation losses, at different Reynolds and Keulegan–Carpenter numbers. The hydrodynamic and overall efficiencies of the system are ultimately provided. |
| first_indexed | 2024-03-11T11:02:10Z |
| format | Article |
| id | doaj.art-6377aafdf58d4c21bdbfb55731833000 |
| institution | Directory Open Access Journal |
| issn | 2523-3963 2523-3971 |
| language | English |
| last_indexed | 2024-03-11T11:02:10Z |
| publishDate | 2023-11-01 |
| publisher | Springer |
| record_format | Article |
| series | SN Applied Sciences |
| spelling | doaj.art-6377aafdf58d4c21bdbfb557318330002023-11-12T12:26:45ZengSpringerSN Applied Sciences2523-39632523-39712023-11-0151211510.1007/s42452-023-05537-yWave-attenuation efficiency of a floating distensible tube at different Keulegan–Carpenter numbersAntónio C. Mendes0Francisco P. Braga1Laboratory of Fluid Mechanics and Turbomachinery, Electromechanical Engineering Department, Universidade da Beira InteriorLaboratory of Fluid Mechanics and Turbomachinery, Electromechanical Engineering Department, Universidade da Beira InteriorAbstract A water-filled floating rubber tube is tested in a wave flume under regular waves of different steepness. The wave excited pressure bulges in the tube induce periodic oscillations of a forward-bent water column at its stern, which in turn activate a pneumatic power take-off system. The purpose of the experiment is to better understand how the tube’s working modes contribute to the wave energy absorption and to quantify the power extracted from the incident waves. By applying Bernoulli’s equation for incompressible airflow, the water column free-surface displacement measurements deliver the pneumatic chamber pressure and the volume flow through the power take-off. Video captions help to reveal the interactions of the tube with the incident waves and further relate them to the system’s efficiency. Additionally, an energy balance enables the assessment of the internal friction and flow separation losses, at different Reynolds and Keulegan–Carpenter numbers. The hydrodynamic and overall efficiencies of the system are ultimately provided.https://doi.org/10.1007/s42452-023-05537-yOcean wave energyWave-flume testsDistensible tubeAttenuation efficiencyEnergy-loss |
| spellingShingle | António C. Mendes Francisco P. Braga Wave-attenuation efficiency of a floating distensible tube at different Keulegan–Carpenter numbers SN Applied Sciences Ocean wave energy Wave-flume tests Distensible tube Attenuation efficiency Energy-loss |
| title | Wave-attenuation efficiency of a floating distensible tube at different Keulegan–Carpenter numbers |
| title_full | Wave-attenuation efficiency of a floating distensible tube at different Keulegan–Carpenter numbers |
| title_fullStr | Wave-attenuation efficiency of a floating distensible tube at different Keulegan–Carpenter numbers |
| title_full_unstemmed | Wave-attenuation efficiency of a floating distensible tube at different Keulegan–Carpenter numbers |
| title_short | Wave-attenuation efficiency of a floating distensible tube at different Keulegan–Carpenter numbers |
| title_sort | wave attenuation efficiency of a floating distensible tube at different keulegan carpenter numbers |
| topic | Ocean wave energy Wave-flume tests Distensible tube Attenuation efficiency Energy-loss |
| url | https://doi.org/10.1007/s42452-023-05537-y |
| work_keys_str_mv | AT antoniocmendes waveattenuationefficiencyofafloatingdistensibletubeatdifferentkeulegancarpenternumbers AT franciscopbraga waveattenuationefficiencyofafloatingdistensibletubeatdifferentkeulegancarpenternumbers |