Abstract
The problem of the generation of cavitation self-oscillations in a liquid flow in a pipe with two resistances is considered. The first resistance is a cavitator, behind which there is an artificial ventilated cavity, where the mean pressure is greater than the atmospheric pressure, while the liquid and gas outflow into the atmosphere takes place through the second resistance. Investigations show that the self-oscillation frequencies are chiefly determined by the cavity properties and the conditions of the outflow into the atmosphere. The generation of different self-oscillation modes is directly associated with the number of waves formed along the cavity length. It is shown that the pressure pipeline properties and the cavity volume have an effect on the cavitation self-oscillation mode (up to four frequency modes can be observable at the same geometry and hydraulic flow parameters). The question arises of whether the self-oscillations can be used for generating pulsed jets at the outlet. It seems that it is the first mode regime that is most suitable for producing the pulsed jets, since in this case the pressure fluctuations in the cavity are maximum. Using the exponential Voitsekhovskii nozzle the regimes, in which an intermittent jet flow of the liquid is realized at the outlet, are experimentally obtained.
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References
I. I. Kozlov and V. V. Prokof’ev, “Distinctive features of wave development on the surface of a cavity with a negative cavitation number,” Dokl. Ross. Akad. Nauk 409(1), 43–47 (2006).
I. I. Kozlov, S. A. Ocheretyanyi, and V. V. Prokof’ev, “Effect of the feeding pipeline properties on the nature of cavitation-induced self-oscillations in the presence of a ventilated cavity with a negative cavitation number,” Fluid Dynamics 51(2), 155–166 (2016).
I. I. Kozlov, S. A. Ocheretyanyi, and V. V. Prokof’ev, “Self-oscillation regimes in a liquid jet curtain separating gas regions with different pressures,” Fluid Dynamics 48(6), 738–746 (2013).
V. B. Kurzin, “Low-frequency natural acoustic oscillations in hydroturbine ducts,” Zh. Prikl. Mekh. Tekh. Fiz., No. 2, 96–105 (1993).
S. L. Tolokonnikov, “Fluid outflow from an orifice in a plane wall in the presence of a variable-strength source on the symmetry plane of flow,” Moscow Univ. Mech. Bulletin 72(2), 89–93 (2017).
I. I. Kozlov, S. A. Ocheretyanyi, and V. V. Prokof’ev, “Experimental investigations of liquid jet outflow into a plane ventilated channel in self-oscillatory regimes,” Fluid Dynamics 46(4), 548–557 (2011).
P. M. Shkapov. I. G. Blagoveshchenskii, E. B. Gartig, and S. A. Doroshenko, “Hysteresis nature of the self-oscillation development in a hydraulic line with a limited artificial gas cavity at the exit,” Nauka i Obrazovanie. Electronic Journal., No. 10 (2013).
B. V. Voitsekhovskii, M. A. Lavrent’ev, and E. A. Antonov, Problems in Theory and Practice of Pulsed Water Jets (Fluid Dynamics Institute, Novosibirsk, 1960) [in Russian].
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Russian Text © The Author(s), 2019, published in Izvestiya RAN. Mekhanika Zhidkosti i Gaza, 2019, No. 3, pp. 16–27.
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Kozlov, I.I., Ocheretyanyi, S.A. & Prokof’ev, V.V. Different Self-Oscillation Modes in Flows with a Ventilated Cavity and Their Possible Use in Forming Periodic Pulsed Jets. Fluid Dyn 54, 308–318 (2019). https://doi.org/10.1134/S0015462819030078
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DOI: https://doi.org/10.1134/S0015462819030078