The Effect of Cavitation and the Degree of Flow Overlap by Cylindrical Bodies on the Flow Pattern and Hydrodynamic and Spectral Characteristics of a Flat-Type Hydrodynamic Generator

Abstract

The results of investigations of the flow behind cylindrical flow bodies in a flat-type hydrodynamic generator with the degree of flow overlap by the bodies S_t/S₀ = 10–80%, the numbers Re = (0.5–5) × 10⁵, the input pressure P_in = 0.2–1.0 MPa, and the output pressure P_out = 0.1–0.8 MPa. It was obtained that two different types of flow can be implemented behind the flow bodies with the same pressure drop: with a developed cavitation zone in which there is an extensive reduced-pressure region and without it but with the formation of vortex structures in the presence of the origins of cavitation bubbles in them. At a certain value of input to output pressures, which are constant for each value of the degree of flow overlap, at frequencies of 0.5–5 kHz powerful pressure peaks of the resonant type arise with an amplitude exceeding 2–2.5 times the highest value of the input pressure.