Publication

Physical Investigation of the Cavitation Phenomenon

François Avellan, Mohamed Farhat
2000
Conference Papers

Abstract

The work presented in this paper is part of a comprehensive research effort aimed at understanding the influence of flow unsteadiness on leading edge cavitation. Pressure measurements are made on the suction side of an oscillating hydrofoil in the High-Speed Cavitation Tunnel. Leading edge roughness effects are investigated for both cases of fixed and oscillating hydrofoils. The cavity that detaches on the rough leading edge is thicker while its length is approximately the same as for the smooth configuration. Pressure fluctuations in the cavity closure region are higher for the rough configuration. It is observed that the cavity detaching on the smooth leading edge at fixed incidence can completely vanish when the hydrofoil oscillates.

Official source

https://infoscience.epfl.ch/entities/publication/70230c65-9fe5-405d-acc7-2f5dfe2f3ad2

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François Avellan, Mohamed Farhat
2000
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/70230c65-9fe5-405d-acc7-2f5dfe2f3ad2

About this result

Related concepts (24)

Pressure measurement

Pressure measurement is the measurement of an applied force by a fluid (liquid or gas) on a surface. Pressure is typically measured in units of force per unit of surface area. Many techniques have been developed for the measurement of pressure and vacuum. Instruments used to measure and display pressure mechanically are called pressure gauges, vacuum gauges or compound gauges (vacuum & pressure). The widely used Bourdon gauge is a mechanical device, which both measures and indicates and is probably the best known type of gauge.

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.

Lift (force)

A fluid flowing around an object exerts a force on it. Lift is the component of this force that is perpendicular to the oncoming flow direction. It contrasts with the drag force, which is the component of the force parallel to the flow direction. Lift conventionally acts in an upward direction in order to counter the force of gravity, but it is defined to act perpendicular to the flow and therefore can act in any direction. If the surrounding fluid is air, the force is called an aerodynamic force.

Related publications (22)

Physical Investigation of the Cavitation Phenomenon

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