doi:10.1007/s13344-020-0062-0

Numerical Study on the Unsteady Characteristics of the Propeller Cavitation in Uniform and Nonuniform Wake Flows

doi: 10.1007/s13344-020-0062-0

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Corresponding author: LI Jie, E-mail: lijie@sjtu.edu.cn

摘要

Abstract: Propeller cavitation is a problematic issue because of its negative effects, such as performances losses, noise, vibration and erosion. Numerical methodology is an effective and efficient technical tool for the study of propeller cavitation, however, it is hard to capture tip-vortex cavitation in the previous work by using common turbulence models based on turbulent-viscosity hypothesis. In this work, the Reynolds-Averaged Naiver−Stokes (RANS) approach, adopting the Reynolds stress turbulence model (RSM), is taken to study the unsteady characteristics of the cavitation on the four-bladed INSEAN E779A model propeller. The numerical simulation was carried out using the commercial CFD software ANSYS Fluent 14.0. One kind of uniform wake flow and two kinds of nonuniform wake flows are considered here. The results in the uniform flow show a good agreement with previous experimental results on both the sheet cavitation and the tip vortex cavitation and prove the ability of the RSM on capturing the tip vortex cavitation. Two kinds of nonuniform wake flows are designed based on the previous experimental researches and the unsteady characteristics of the propeller cavitation are analyzed by comparing the results in the uniform and two nonuniform wake flows together.
- propeller cavitation /
- wake flow /
- Reynolds stress model

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Figure 1. INSEAN E779A model propeller shape.

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Figure 2. Scheme of the computational domain.

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Figure 3. Computational meshes.

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Figure 4. y⁺ distribution on both sides of the propeller in uniform wake flow.

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Figure 5. Cavitation shapes on the propeller blade in the uniform wake flow.

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Figure 6. Flow condition and the axial velocity distribution in non-homogeneous flow cited from (a) Salvatore et al.’s (2009) experiment and (b) Felli and Di Felice’s (2005) experiment.

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Figure 7. Sketch for the three slices of the cross section.

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Figure 8. Axial velocity distribution at three cross sections in different wake flow (unit: m/s).

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Figure 9. Cavity evolution in the uniform wake flow, and the interval angle between two adjacent pictures being 32.4°.

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Figure 11. Cavity evolution in the non-uniform wake flow of WF2, the interval angle between two adjacent pictures being 32.4°.

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Figure 10. Cavity evolution in the non-uniform wake flow of WF1, the interval angle between two adjacent pictures being 32.4°.

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Figure 12. Contour of pressure at the cross section of x=0, the color bar with the unit of kPa, and the interval angle between two adjacent pictures being 32.4° for each case.

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Figure 13. Volume variation of the cavity with respect to time.

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Figure 14. Iso-surface for constant value of Q-criterion (Q=10000 s⁻²) in three wake flows.

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Figure 15. Contour of velocity distribution with the streamlines (black solid lines) at the cross section of x=0, and blue dash lines being used to confine the outer region for analytical convenience.

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