Abstract
The regime of cavitation self-oscillations in a hydraulic system that contains a ventilated cavity with a negative cavitation number is used to create a generator of periodic impulse jets. The influence of the parameters of cavitator and output nozzle of the generator on the intensity of the impact of liquid outflowing on an obstacle (shield) located perpendicular to the direction of jet outflow is studied. It is found that increase in the nozzle length can significantly increase the efficiency of the generator, and a smooth constriction of the channel ahead of the cavitator can help to increase the operating range of the generator in the direction of larger gas blows. It is shown that there is a scale effect, namely, the relative intensity of self-oscillations decreases with increase in the liquid head pressure; however, it tends to reach a horizontal asymptote.
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REFERENCES
Kozlov, I.I. and Prokof’ev, V.V., Development of waves on a cavity surface with a negative cavitation number, Doklady Physics, 2006, vol. 56, no. 7, pp. 361–364.
Kozlov, I.I., Ocheretyanyi, S.A., and Prokof’ev, V.V., Self-oscillation regimes in a liquid jet curtain separating gas regions with different pressures, Fluid Dyn., 2013, vol. 48, no. 6, pp. 738–746.
Ocheretyanyi, S.A. and Prokof’ev, V.V., Nozzle contraction effect on the performance of the generator of periodic pulsed jets, Fluid Dyn., 2022, vol. 57, no. 2, pp. 122–134. https://doi.org/10.1134/S0015462822020069
Semko, A.N., Impul’snyye strui zhidkosti vysokoy skorosti i ikh primeneniye: monografiya (High-Velocity Pulsed Liquid Jets and Their Application), Ed. by Semko, A.N., Donetsk: DonNU, 2014.
Atanov, G.A. and Semko, A.N., Numerical analysis of the jet flows of compressible water, in: Proc. of International Summer Scientific School “High Speed Hidrodynamics”, June 2004, Cheboksary, Computational Publications, Russia, 2004, pp. 39–44.
Savchenko, N.V. and Yakhno, O.M., Hydrodynamic approaches to the formation of pulsed jet for hydraulic destruction of solid materials, Vestnik Sumsk. Gos. Univ. Ser. Tekhn. Nauki, 2003, no. 12 (58), pp. 92–98.
Shkapov, P.M., Blagoveshchenskii, I.G., Gartig, E.B., and Doroshenko S.A., On the hysteresis nature of the development of self-oscillations in a hydraulic line with a limited artificial gas cavity at the outlet, Nauka i obrazovanie, Electronic sci.-tech. ed. MGTU im. N.E. Bauman, 2013, no. 10, pp. 1–10.
Prokof’ev, V.V., Ocheretyanyi, S.A., and Yakovlev, E.A., Using cavitation self-oscillation regimes to generate periodic pulsed jets, J. Appl. Mech. Techn. Phys., 2021, vol. 62, no. 1, pp. 86–95.
Idel’chik, I.E., Spravochnik po gidravlicheskim soprotivleniyam (Handbook on Hydraulic Resistances), Moscow–Leningrad: Gosenergoizdat, 1960.
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Translated by E.A. Pushkar
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Ocheretyanyi, S.A., Prokof’ev, V.V. Influence of the Cavitator and Nozzle Parameters on the Efficiency of Operation of a Generator of Pulsed Jets. Fluid Dyn 58, 838–851 (2023). https://doi.org/10.1134/S001546282360058X
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DOI: https://doi.org/10.1134/S001546282360058X