It has been established experimentally and confirmed analytically that before the stall of a centrifugal impeller pump, self-oscillations (surging) of the pump are set up in the region of ascending cavitation branchings of its monotonically decreasing head characteristic. Beyond this region, the pumping mode of such a pump is absolutely stable. It has been established that changes in the nonstationary operation of a centrifugal impeller pump produced by variation of its wave resistance are diametrically opposite in character in cavitation and cavitation-free modes.
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Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 85, No. 1, pp. 117–122, January–February, 2012.
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Gotsulenko, V.V., Gotsulenko, V.N. Distinctive feature of self-oscillations (surging) of impeller pumps. J Eng Phys Thermophy 85, 125–130 (2012). https://doi.org/10.1007/s10891-012-0629-6
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DOI: https://doi.org/10.1007/s10891-012-0629-6