Publication

Cavitation Erosion Tests on a 2D Hydrofoil using surface-mounted Obstacles

François Avellan, Mohamed Farhat
2003
Journal Articles

Abstract

Anewcavitation erosion testing procedure in high-speed cavitation tunnel is presented. The method is based on surface-mounted obstacles on a plane-convex hydrofoil leading edge. This experimental set-up is able to accelerate the accumulation of damage on specimens located behind the obstacles and presents several advantages. Measurable cavitation erosion damage has been obtained for a thermal spray coating and a stainless steel 13.4 after 75 h of operation. The hydrodynamic operating conditions have been an inlet flow velocity of 35 m/s, a sigma value of 1 and an incidence angle of 3◦. Final erosion results have been compared with similar data obtained with the vortex cavitation generator (VCG) and the vibratory apparatus as a continuation of a previous study, see [Wear 233–235 (1999) 65]. The cavitation induced vibration monitoring provides a way to explain the apparent discrepancy of the erosion data between the tests with the high-speed cavitation tunnel and the vibratory apparatus.

Official source

https://infoscience.epfl.ch/entities/publication/a8486235-ccd5-4a79-b191-e6ec5c094077

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François Avellan, Mohamed Farhat
2003
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/a8486235-ccd5-4a79-b191-e6ec5c094077

About this result

Related concepts (27)

Hydrofoil

A hydrofoil is a lifting surface, or foil, that operates in water. They are similar in appearance and purpose to aerofoils used by aeroplanes. Boats that use hydrofoil technology are also simply termed hydrofoils. As a hydrofoil craft gains speed, the hydrofoils lift the boat's hull out of the water, decreasing drag and allowing greater speeds. The hydrofoil usually consists of a winglike structure mounted on struts below the hull, or across the keels of a catamaran in a variety of boats (see illustration).

Cavitation

Cavitation is a phenomenon in which the static pressure of a liquid reduces to below the liquid's vapour pressure, leading to the formation of small vapor-filled cavities in the liquid. When subjected to higher pressure, these cavities, called "bubbles" or "voids", collapse and can generate shock waves that may damage machinery. These shock waves are strong when they are very close to the imploded bubble, but rapidly weaken as they propagate away from the implosion. Cavitation is a significant cause of wear in some engineering contexts.

Thermal spraying

Thermal spraying techniques are coating processes in which melted (or heated) materials are sprayed onto a surface. The "feedstock" (coating precursor) is heated by electrical (plasma or arc) or chemical means (combustion flame). Thermal spraying can provide thick coatings (approx. thickness range is 20 microns to several mm, depending on the process and feedstock), over a large area at high deposition rate as compared to other coating processes such as electroplating, physical and chemical vapor deposition.