Creation and maintenance of cavities under horizontal surfaces in steady and gust flows / R. E. A. Arndt in Transactions of the ASME . Journal of fluids engineering, Vol. 131 N° 11 (Novembre 2009)  

Public ISBD [article]  inTransactions of the ASME . Journal of fluids engineering > Vol. 131 N° 11 (Novembre 2009) . - 10 p. Titre : Creation and maintenance of cavities under horizontal surfaces in steady and gust flows Type de document : texte imprimé Auteurs : R. E. A. Arndt, Auteur ; Amromin, E. L., Auteur ; W. T. Hambleton, Auteur Année de publication : 2010 Article en page(s) : 10 p. Note générale : fluids engineering Langues : Anglais (eng) Mots-clés : air supply  horizontal surface  gust flows  cavitation Résumé : An experimental study of air supply to bottom cavities stabilized within a recess under a horizontal surface has been carried out in a specially designed water tunnel. The air supply necessary for creating and maintaining an air cavity in steady and gust flows has been determined over a wide range of speed. Flux-free ventilated cavitation at low flow speeds has been observed. Stable multiwave cavity forms at subcritical values of Froude number were also observed. It was found that the cross-sectional area of the air supply ducting has a substantial effect on the air demand. Air supply scaling laws were deduced and verified with the experimental data obtained. En ligne : http://fluidsengineering.asmedigitalcollection.asme.org/issue.aspx?journalid=122 [...] [article] Creation and maintenance of cavities under horizontal surfaces in steady and gust flows [texte imprimé] / R. E. A. Arndt, Auteur ; Amromin, E. L., Auteur ; W. T. Hambleton, Auteur . - 2010 . - 10 p. fluids engineering Langues : Anglais (eng) in Transactions of the ASME . Journal of fluids engineering > Vol. 131 N° 11 (Novembre 2009) . - 10 p. Mots-clés : air supply  horizontal surface  gust flows  cavitation Résumé : An experimental study of air supply to bottom cavities stabilized within a recess under a horizontal surface has been carried out in a specially designed water tunnel. The air supply necessary for creating and maintaining an air cavity in steady and gust flows has been determined over a wide range of speed. Flux-free ventilated cavitation at low flow speeds has been observed. Stable multiwave cavity forms at subcritical values of Froude number were also observed. It was found that the cross-sectional area of the air supply ducting has a substantial effect on the air demand. Air supply scaling laws were deduced and verified with the experimental data obtained. En ligne : http://fluidsengineering.asmedigitalcollection.asme.org/issue.aspx?journalid=122 [...]

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Synergy of resistance reduction effects for a ship with bottom air cavity / Amromin, E. L. in Transactions of the ASME . Journal of fluids engineering, Vol. 133 N° 2 (Fevrier 2011)  

Public ISBD [article]  inTransactions of the ASME . Journal of fluids engineering > Vol. 133 N° 2 (Fevrier 2011) . - 07 p. Titre : Synergy of resistance reduction effects for a ship with bottom air cavity Type de document : texte imprimé Auteurs : Amromin, E. L., Auteur ; Metcalf, B., Auteur ; Karafiath, G., Auteur Année de publication : 2011 Article en page(s) : 07 p. Note générale : Fluids engineering Langues : Anglais (eng) Mots-clés : Cavitation Drag reduction Fluid oscillations Friction Ships Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Friction on a surface covered by an air cavity is much less than friction in water but there is a resistance penalty caused by the cavity tail oscillations. Nevertheless, there is a method for designing the ship bottom form for suppressing these oscillations. This study describes the design method and calm water towing tank tests for a ship with a bottom ventilated air cavity operating at Froude range 0.45 DEWEY : 620.1 ISSN : 0098-2202 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JFEGA400013 [...] [article] Synergy of resistance reduction effects for a ship with bottom air cavity [texte imprimé] / Amromin, E. L., Auteur ; Metcalf, B., Auteur ; Karafiath, G., Auteur . - 2011 . - 07 p. Fluids engineering Langues : Anglais (eng) in Transactions of the ASME . Journal of fluids engineering > Vol. 133 N° 2 (Fevrier 2011) . - 07 p. Mots-clés : Cavitation Drag reduction Fluid oscillations Friction Ships Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Friction on a surface covered by an air cavity is much less than friction in water but there is a resistance penalty caused by the cavity tail oscillations. Nevertheless, there is a method for designing the ship bottom form for suppressing these oscillations. This study describes the design method and calm water towing tank tests for a ship with a bottom ventilated air cavity operating at Froude range 0.45 DEWEY : 620.1 ISSN : 0098-2202 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JFEGA400013 [...]

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