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HELICE SUPERCAVITATION [1 record]

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Record 1 2015-04-13

English

Subject field(s)
  • Engineering
  • Fluid Mechanics and Hydraulics (Physics)
  • Hydroplanes and Hydrofoils
DEF

A marine propeller which has special blade sections so that at sufficiently high speed the whole back of each blade becomes enveloped by a smooth sheet of cavitation.

OBS

cavitation: Disturbance around revolving propeller blades struts, etc., caused by collapse of transient pressure disturbances resulting from flow of water over their surfaces.

OBS

supercavitation: ... cavitation leaving the trailing face of a propeller blade free of water.

French

Domaine(s)
  • Ingénierie
  • Mécanique des fluides et hydraulique (Physique)
  • Hydroglisseurs et hydroptères
CONT

Vibration, érosion rapide des surfaces solides, abaissement du rendement limitent les caractéristiques des turbomachines. Ce problème complexe a pourtant une solution dans le cas particulier des hélices supercavitantes installées sur les bateaux rapides : la cavitation sur les faces de l'hélice est amorcée à basse vitesse par une forme appropriée des pales et, à vitesse de régime, chaque pale est enveloppée par un nuage de cavitation; l'implosion des bulles de vapeur ayant lieu derrière les pales [...], l'érosion est supprimée.

Spanish

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