Generation of bubbles for friction-reducing ship and method...

Details Generation of bubbles for friction-reducing ship and method... Generation of bubbles for friction-reducing ship and method...

B - Operations, Transporting

63

B

B63B 1/38 (2006.01)

Patent

CA 2242698

A method is provided for reducing skin-friction of a ship moving through bubbly flow fields generated in proximity of hull surfaces by jetting gas through a plurality of jet nozzles provided on hull surfaces of the ship. The gas flow rate is controlled so as to establish a peak void fraction in a turbulent boundary layer, by applying an observation that the location of a peak void fraction shifts away in a direction normal to the hull surface with increasing gas flow rate through the jet nozzles.

Présentation d'une méthode permettant de réduire le frottement superficiel d'un navire se déplaçant, au moyen de champs à courant de bulles produits près des surfaces de la coque en projetant du gaz par une série de buses disposées sur les surfaces de la coque du navire. Le débit de gaz est réglé de façon à créer une fraction de vide maximal dans une couche limite turbulente, en appliquant l'observation selon laquelle l'emplacement de la fraction de vide maximal s'écarte dans une direction normale par rapport à la surface de la coque avec l'accroissement du débit de gaz passant dans les buses.

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