{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,7,30]],"date-time":"2025-07-30T13:03:44Z","timestamp":1753880624229,"version":"3.41.2"},"reference-count":0,"publisher":"American Society of Mechanical Engineers","content-domain":{"domain":["asmedigitalcollection.asme.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2018,6,17]]},"abstract":"<jats:p>The oscillating-water-column (OWC) wave energy converter consists of a hollow (fixed or floating) structure, open to the sea below the water surface. Wave action alternately compresses and decompresses the air trapped above the inner water free-surface, which forces air to flow through a turbine coupled to a generator. The spring-like effect of air compressibility in the chamber is related to the density-pressure relationship. It is known to significantly affect the power performance of the full-sized converter, and is normally not accounted for in model testing at reduced scale. Three theoretical models of increasing complexity are analysed and compared: (i) the incompressible air model; (ii) the isentropic process model; (iii) and the (more difficult and rarely adopted) adiabatic non-isentropic process model in which losses due to the imperfectly efficient turbine are accounted for. The air is assumed as a perfect gas. The hydrodynamic modelling of wave energy absorption is based on linear water wave theory. The validity of the various simplifying assumptions, especially in the aero-thermodynamic domain, is examined and discussed. The validity of the three models is illustrated by a case study with numerical results for a fixed-structure OWC equipped with a Wells turbine subject to irregular waves.<\/jats:p>","DOI":"10.1115\/omae2018-77096","type":"proceedings-article","created":{"date-parts":[[2018,9,25]],"date-time":"2018-09-25T08:33:30Z","timestamp":1537864410000},"update-policy":"https:\/\/doi.org\/10.1115\/crossmarkpolicy-asme","source":"Crossref","is-referenced-by-count":5,"title":["The Spring-Like Air Compressibility Effect in OWC Wave Energy Converters: Hydro-, Thermo- and Aerodynamic Analyses"],"prefix":"10.1115","author":[{"given":"Ant\u00f3nio F. O.","family":"Falc\u00e3o","sequence":"first","affiliation":[{"name":"Universidade de Lisboa, Lisbon, Portugal"}]},{"given":"Jo\u00e3o C. C.","family":"Henriques","sequence":"additional","affiliation":[{"name":"Universidade de Lisboa, Lisbon, Portugal"}]}],"member":"33","published-online":{"date-parts":[[2018,9,25]]},"event":{"name":"ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering","start":{"date-parts":[[2018,6,17]]},"sponsor":["Ocean, Offshore and Arctic Engineering Division"],"location":"Madrid, Spain","end":{"date-parts":[[2018,6,22]]},"acronym":"OMAE2018"},"container-title":["Volume 11A: Honoring Symposium for Professor Carlos Guedes Soares on Marine Technology and Ocean Engineering"],"original-title":[],"link":[{"URL":"http:\/\/asmedigitalcollection.asme.org\/OMAE\/proceedings-pdf\/doi\/10.1115\/OMAE2018-77096\/2536940\/v11at12a038-omae2018-77096.pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2019,9,1]],"date-time":"2019-09-01T19:23:21Z","timestamp":1567365801000},"score":1,"resource":{"primary":{"URL":"https:\/\/asmedigitalcollection.asme.org\/OMAE\/proceedings\/OMAE2018\/51326\/Madrid,%20Spain\/274147"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2018,6,17]]},"references-count":0,"URL":"https:\/\/doi.org\/10.1115\/omae2018-77096","relation":{},"subject":[],"published":{"date-parts":[[2018,6,17]]},"article-number":"V11AT12A038"}}