Publication

Dynamics of vortex cavitation involved in the erosion of hydraulic machines

François Avellan
1987
Conference Papers

Abstract

In order to investigate the dynamics of the vortex cavitation, which is found to be responsible of the cavitation erosion in hydraulic machinery, a cavitation vortex generator (CVG) is used. By producing the cyclic growth and collapse of cavitation vortex, this device provides a good simulation of the realistic hydrodynamics situation corresponding to the travelling cavities downstream a fixed leading-edge cavity. The simultaneous use of the shock and the pressure time-history recordings and the high speed Cranz-Schardin visualizations allows us to describe the instantaneous cavity motion in the CVG test section . The most important result is the evidence of a strong spherica1 shock waves emission at the time of the cavitation vortex collapse, leading to overpressure of more than 10 kbar.

Official source

https://infoscience.epfl.ch/entities/publication/5da0179b-b19d-46d2-a865-4342a5fb1293

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François Avellan
1987
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/5da0179b-b19d-46d2-a865-4342a5fb1293

About this result

Related concepts (32)

Hydraulic machinery

Hydraulic machines use liquid fluid power to perform work. Heavy construction vehicles are a common example. In this type of machine, hydraulic fluid is pumped to various hydraulic motors and hydraulic cylinders throughout the machine and becomes pressurized according to the resistance present. The fluid is controlled directly or automatically by control valves and distributed through hoses, tubes, or pipes.

Hydraulic fluid

A hydraulic fluid or hydraulic liquid is the medium by which power is transferred in hydraulic machinery. Common hydraulic fluids are based on mineral oil or water. Examples of equipment that might use hydraulic fluids are excavators and backhoes, hydraulic brakes, power steering systems, automatic transmissions, garbage trucks, aircraft flight control systems, lifts, and industrial machinery. Hydraulic systems like the ones mentioned above will work most efficiently if the hydraulic fluid used has zero compressibility.

Hydraulic cylinder

A hydraulic cylinder (also called a linear hydraulic motor) is a mechanical actuator that is used to give a unidirectional force through a unidirectional stroke. It has many applications, notably in construction equipment (engineering vehicles), manufacturing machinery, elevators, and civil engineering. A hydraulic cylinder is a hydraulic actuator that provides linear motion when hydraulic energy is converted into mechanical movement. It can be likened to a muscle in that, when the hydraulic system of a machine is activated, the cylinder is responsible for providing the motion.

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Dynamics of vortex cavitation involved in the erosion of hydraulic machines

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