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  • Monitoring of cavitation by sound in audible range and some new proposals for prevention cavitation in kinetic pumps [Elektronski vir]
    Čudina, Mirko
    Cavitation in kinetic pumps can cause deterioration of the hydraulic performance, damage of the pump by pitting and material erosion, and structure vibration and noise. To prevent cavitation in a ... pump we have to know the beginning and development of the cavitation in the pump. For this purpose, the signal of noise in audible range can be used, among other possibilities. Our experiments have shown that there is a discrete frequency tone or narrowband frequency range within the audible noise spectra, which are in strong correlation with development of the cavitation process in the pump. We found that the amplitudes in the narrowband frequency range are increased by up to 15 dB(A) and more when cavitation is fully developed. Therefore, this characteristic discrete frequency tone or narrowband frequency range can be used to detect the incipient of cavitation and its development. When fully developed cavitation in the pump is detected its prevention has to be done. In order to prevent cavitation in a kinetic pump three new methods will be presented and discussed: 1) by injection of the water in the suction nozzle from the pump discharge, 2) by injection of the water in the suction nozzle from a secondary pump or waterworks and 3) by supplying water in the suction nozzle from a suction tank through an additional pipe connected parallel to the main suction pipe. Experimental results have shown that the last two are effective and appropriate for prevention of cavitation in a kinetic pump. The methods are based on activation of a special valve working on the principle of pressure difference before and after the valve, usually when 3% drop of the total delivery head is achieved and cavitation is fully developed. In this moment the valve opens the connection to the water supply causing increase of the static pressure in the suction nozzle.
    Vir: Proceedings [Elektronski vir] (Str. INV-03 1-10)
    Vrsta gradiva - prispevek na konferenci ; neleposlovje za odrasle
    Leto - 2012
    Jezik - angleški
    COBISS.SI-ID - 12453659

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