Abstract
The article describes the course of the ultrasonic cavitation in a hydraulic tank and the hydrodynamic cavitation in a gear pump. The course of those phenomena was confirmed in experimental tests carried out with the use of a tank and a pump made of transparent plastics. It has been proved that the oscillator-cavitation system made according to the original project is useful to induce the phenomenon of ultrasonic cavitation. It has also been shown that the PIV visualization method, consisting in a special system of illuminating transparent objects and recording the flow through those objects with a fast camera, is useful for the studying of the cavitation phenomena. A visible interaction between the ultrasonic and the hydrodynamic cavitation was observed. The induction of ultrasonic cavitation in the tank causes degassing of the oil, and the degassed oil supplying the pump reduces the hydrodynamic cavitation in its internal channels and clearances. This is an example of beneficial effects of the ultrasonic cavitation on the operation of a pump and a hydraulic system. The presented work is an example of effective co-operation between the communities of Wroclaw University of Science and Technology and Igor Sikorsky Kiyv Politechnic Institute, National Technical University of Ukraine.
Highlights
Cavitation is a physical phenomenon involving a rapid release of gas bubbles dissolved in a liquid
Based on [1, 2, 14, 24, 26], the course of the ultrasonic cavitation phenomena occurring in a hydraulic tank and the hydrodynamic cavitation in a gear pump have been described
It was confirmed that the PIV visualization method based on a special system of illuminating transparent objects and recording the flow through those objects by means of a fast camera are useful in the research on the cavitation phenomena [24, 26]
Summary
Cavitation is a physical phenomenon involving a rapid release of gas bubbles dissolved in a liquid. Cavitation is caused by the flow of a liquid through various obstacles, such as internal channels and clearances, edges, orifices or holes. In those places, there is a local rapid decrease in pressure pO below the pressure of gases pI, which results in the occurrence of cavitation. There is a local rapid decrease in pressure pO below the pressure of gases pI, which results in the occurrence of cavitation This is called HYDRODYNAMIC CAVITATION as it is caused by the flow of a liquid through obstacles. – to investigate the phenomenon of hydrodynamic cavitation in a gear pump supplied from a degassed tank,. – to adapt the PIV visualization method for the study of the cavitation phenomena
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