Abstract
Experimental investigations of liquid jet flows performed earlier in the presence of an artificial cavity having a negative cavitation number showed that under certain conditions cavitation self-oscillations with high pressure fluctuation intensity can occur in hydraulic systems. In this study, we consider the flow in a manifold consisting of a resistance (cavitator), an artificial gas cavity, and a convergent nozzle, through which the liquid and the gas flow out into the atmosphere. It is found that at moderate cavity ventilations, when the self-oscillations are absent, pressure pulses of impact nature are observable in the region of interaction between the jet and an obstacle (shield). Apparently, this effect is due to an intense development of Taylor structures at the boundary of the cavity with a negative cavitation number that forms in this flow. The dependence of the intensity of the periodic pulsed impact on the obstacle on the nozzle convergence is investigated for two frequency regimes of cavitation self-oscillations. The calculations performed within the framework of a one-dimensional model of the outflow of an incompressible fluid portion from the nozzle are in good agreement with the experimental data.
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Translated by M. Lebedev
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Ocheretyanyi, S.A., Prokof’ev, V.V. Nozzle Contraction Effect on the Performance of the Generator of Periodic Pulsed Jets. Fluid Dyn 57, 122–134 (2022). https://doi.org/10.1134/S0015462822020069
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DOI: https://doi.org/10.1134/S0015462822020069