Abstract
Cavitation involves complex multiphase turbulence and has important research significance. In this study, the Schnerr–Sauer cavitation model was used to model cavitation, and the detached-eddy simulation (DES) method was used to calculate the unsteady natural cavitating flow. The predicted results are in good agreement with experimentally measured cavity evolution and pressure values, demonstrating the effectiveness of this numerical method. Low temperature causes changes in the properties of water. The density of water at 0° is 999.84 kg/m3 and the density of water at 25° is 997.04. Cavitation evolution and shedding are analyzed at temperatures of 0 °C and 25 °C. The results showed that lower temperature increased the frequency of cavitation and enhanced pressure pulsation. At the same time, low temperature also increases the frequency of cavity shedding and shortens the cycle. In addition, based on the Ω method, the difference between vortex dynamics at various temperatures was studied, and it was found that different cavity stages showed different vortex structure characteristics, and lower temperature would aggravate the change of wake vortex structure. At the same time, the analysis of the turbulence characteristics in the downstream of the cavity shows that the lower temperature reduces the velocity pulsation and reduces the turbulence integral scale. At the end of the model, large-scale pulsations are transformed into small-scale pulsations.
Highlights
Received: 30 November 2020Accepted: 20 December 2020Published: 29 December 2020Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations.license.Cavitation usually occurs when the pressure in a liquid stream drops below the local saturated vapor pressure, causing cavities to be generated at the internal or liquid–solid interface [1,2]
The results show that the compressible method can predict the reentrant jet dynamics well
We use STAR-CCM+ to conduct numerical simulation research; the Evolution and=Pressure time step was set to ∆tt
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Cavitation usually occurs when the pressure in a liquid stream drops below the local saturated vapor pressure, causing cavities to be generated at the internal or liquid–solid interface [1,2]. Cavitating flows are typically unsteady and exhibit phase changes, turbulence, and multi-scale vortices. Such flows occur in various fluidic machines, including liquid rocket engines, turbines, marine propellers, and hydrofoils. Cavitation can cause serious problems in fluid machinery, such as pressure fluctuations, noise, vibration, and corrosion. Cavitating flows continue to be widely studied [3,4,5,6]
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