The efficacy of air-bubble lubrication for decreasing friction resistance

AuthorsFoeth, Eggers, Quadvlieg
Conference/JournalInternational conference on ship drag reduction
DateMay 1, 2010

Reducing the frictional resistance by air injection below the ship in combination with special coatings is an active area of research; anecdotally, performance gains are usually large. The paper gives an overview of some model scale and full scale measurements results of ships with one type of air lubrication - air bubble lubrication. The experiments were performed for the EU-SMOOTH project. The first series of experiments focused on an inland shipping vessel that was tested both on model scale and on full scale, with and without air lubrication. A second series of tests consisted of maneuvering and seakeeping tests with a model painted with different coatings and with and without air lubrication. No appreciable effects of air bubble lubrication were found during the resistance and propulsion tests at either model or full scale and no significant effects of air bubble lubrication on maneuvering and seakeeping model tests could be determined.

Tags
manoeuvring and nautical studiesstability, seakeeping and ocean engineeringsustainable propulsionmeasurements and controldata sciencemanoeuvringresistance and propulsioninfrastructurepoweringseakeepingdefencepassengers and yachtingtransport and shippingmodel testing