{"?xml":{"@version":"1.0"},"edm:RDF":{"@xmlns:dc":"http://purl.org/dc/elements/1.1/","@xmlns:edm":"http://www.europeana.eu/schemas/edm/","@xmlns:wgs84_pos":"http://www.w3.org/2003/01/geo/wgs84_pos","@xmlns:foaf":"http://xmlns.com/foaf/0.1/","@xmlns:rdaGr2":"http://rdvocab.info/ElementsGr2","@xmlns:oai":"http://www.openarchives.org/OAI/2.0/","@xmlns:owl":"http://www.w3.org/2002/07/owl#","@xmlns:rdf":"http://www.w3.org/1999/02/22-rdf-syntax-ns#","@xmlns:ore":"http://www.openarchives.org/ore/terms/","@xmlns:skos":"http://www.w3.org/2004/02/skos/core#","@xmlns:dcterms":"http://purl.org/dc/terms/","edm:WebResource":[{"@rdf:about":"http://www.dlib.si/stream/URN:NBN:SI:DOC-6Z8V5MO9/08647717-066d-4848-a820-29fff42b4de0/HTML","dcterms:extent":"37 KB"},{"@rdf:about":"http://www.dlib.si/stream/URN:NBN:SI:DOC-6Z8V5MO9/f62ffd31-2613-43ac-85e1-5c7a29f1fde5/PDF","dcterms:extent":"908 KB"},{"@rdf:about":"http://www.dlib.si/stream/URN:NBN:SI:DOC-6Z8V5MO9/c607a1a4-36ed-4974-ac08-9b74e1fcc6af/TEXT","dcterms:extent":"45 KB"}],"edm:TimeSpan":{"@rdf:about":"1999-2025","edm:begin":{"@xml:lang":"en","#text":"1999"},"edm:end":{"@xml:lang":"en","#text":"2025"}},"edm:ProvidedCHO":{"@rdf:about":"URN:NBN:SI:DOC-6Z8V5MO9","dcterms:isPartOf":[{"@rdf:resource":"https://www.dlib.si/details/URN:NBN:SI:spr-6QOUKQ9A"},{"@xml:lang":"sl","#text":"Strojniški vestnik"}],"dcterms:issued":"2005","dc:creator":["Dular, Matevž","Stoffel, Bernd","Širok, Brane"],"dc:format":[{"@xml:lang":"sl","#text":"14 strani"},{"@xml:lang":"sl","#text":"številka:3"},{"@xml:lang":"sl","#text":"letnik:51"},{"@xml:lang":"sl","#text":"str. 132-145"}],"dc:identifier":["ISSN:0039-2480","COBISSID:8240411","URN:URN:NBN:SI:doc-6Z8V5MO9"],"dc:language":["en","sl"],"dc:publisher":[{"@xml:lang":"sl","#text":"Association of Mechanical Engineers and Technicians of Slovenia et al."},{"@xml:lang":"sl","#text":"Zveza strojnih inženirjev in tehnikov Slovenije et al."}],"dc:subject":[{"@xml:lang":"sl","#text":"erozija"},{"@xml:lang":"sl","#text":"gibanje tekočin"},{"@xml:lang":"sl","#text":"hitrosti tokov"},{"@xml:lang":"sl","#text":"kavitacija"},{"@xml:lang":"sl","#text":"količine plinov"},{"@xml:lang":"sl","#text":"plini v vodi"},{"@xml:lang":"sl","#text":"tokovne razmere"},{"@rdf:resource":"http://www.wikidata.org/entity/Q80026"}],"dcterms:temporal":{"@rdf:resource":"1999-2025"},"dc:title":{"@xml:lang":"sl","#text":"Vpliv količine plinov v vodi in hitrosti toka na agresivnost kavitacijske erozije| The influence of the gas content of water and the flow velocity on cavitation erosion aggressiveness|"},"dc:description":[{"@xml:lang":"sl","#text":"A study of the influence of the gas content of water and the flow velocity on cavitation erosion aggressiveness was performed. A cavitation tunnel with a single hydrofoil was used for the experiments. While the cavitation number andthe mean flow velocity remained constant throughout the tests, the gas content of the water was changed in steps from low (approximately 1%) to high (4 %). The gas content of the water was adjusted with a bubble generator. In addition tests at a constant cavitation number and water gas content but different mean flow velocities (10, 13 and 16 mžs) were made. A thin copper foil, applied to the surface of the hydrofoil, was used as an erosion sensor. Images of the damaged, copper-coated hydrofoil surface were taken at an appropriate magnification. A pit-count method, based on computer-aided image processing, was used for direct measurements of the cavitation erosion by evaluating the damage on the surface of the hydrofoil. Clear evidence for the influence of the gas content and the velocity on the erosion intensity was found. The cavitation erosive aggressiveness exponentially drops when the content of the water is increased. A power law was confirmed for the velocity's influence on the cavitation erosive aggressiveness. The presented results promise the possibility of deriving a cavitation erosion model and the possibility of cavitation erosion prediction using only numerical tools in the future"},{"@xml:lang":"sl","#text":"V prispevku je predstavljena studija vpliva količine plinov v vodi in hitrosti toka na agresivnost kavitacjske erozije. Preizkusi so bili opravljeni na osamljenem profilu v kavitacijskem kanalu. Medtem ko sta bila kavitacijsko število in hitrost toka nespremenljiva, smo v korakih spreminjali količino plinov v vodi od majhne (približno 1%) do velike vsebnosti (4%). Količino plinov v vodi smo nadzorovali z generatorjem mehurčkov. Pri tem so bili narejeni preizkusi ob konstantnem kavitacijskem številu in količini raztopljenih plinov, vendar različnih hitrostih toka (10, 13 in 16 mžs). Za zaznavalo kavitacijske erozije je rabila tanka bakrena folija, nanešena na profil. Pod določeno povečavo smo posneli slike poškodovane površine bakrene folije. Za neposredno meritev kavitacijske erozije smo uporabili metodo štetja luknjic, ki temelji na računalnisko podprti vizualizaciji. Preizkusi so pokazali očiten vpliv količine plinov in hitrosti toka na intenzivnost erozije. Agresivnost kavitacijske erozije se eksponentno zmanjšuje, ko večamo količino raztopljenih plinov. Potrjena je bila hipoteza o potenčnem zakonu za vpliv hitrosti toka na agresivnost kavitacijske erozije. Predstavljeni rezultati obetajo dobre možnosti za razvoj modela kavitacijske erozije ter možnost napovedi kavitacijske erozije z izključno numeričnimi metodami"}],"edm:type":"TEXT","dc:type":[{"@xml:lang":"sl","#text":"znanstveno časopisje"},{"@xml:lang":"en","#text":"journals"},{"@rdf:resource":"http://www.wikidata.org/entity/Q361785"}]},"ore:Aggregation":{"@rdf:about":"http://www.dlib.si/?URN=URN:NBN:SI:DOC-6Z8V5MO9","edm:aggregatedCHO":{"@rdf:resource":"URN:NBN:SI:DOC-6Z8V5MO9"},"edm:isShownBy":{"@rdf:resource":"http://www.dlib.si/stream/URN:NBN:SI:DOC-6Z8V5MO9/f62ffd31-2613-43ac-85e1-5c7a29f1fde5/PDF"},"edm:rights":{"@rdf:resource":"http://rightsstatements.org/vocab/InC/1.0/"},"edm:provider":"Slovenian National E-content Aggregator","edm:intermediateProvider":{"@xml:lang":"en","#text":"National and University Library of Slovenia"},"edm:dataProvider":{"@xml:lang":"sl","#text":"Univerza v Ljubljani, Fakulteta za strojništvo"},"edm:object":{"@rdf:resource":"http://www.dlib.si/streamdb/URN:NBN:SI:DOC-6Z8V5MO9/maxi/edm"},"edm:isShownAt":{"@rdf:resource":"http://www.dlib.si/details/URN:NBN:SI:DOC-6Z8V5MO9"}}}}