Numerical Study on the Unsteady Characteristics of the Propeller Cavitation in Uniform and Nonuniform Wake Flows
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tudy on the Unsteady Characteristics of the Propeller Cavitation in Uniform and Nonuniform Wake Flows GONG Zhao-xin, CHEN Ying, LI Jie*, CHEN Xin, LU Chuan-jing Key Laboratory of Hydrodynamics (Ministry of Education), School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China Received November 12, 2019; revised April 17, 2020; accepted May 24, 2020 ©2020 Chinese Ocean Engineering Society and Springer-Verlag GmbH Germany, part of Springer Nature 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. Key words: propeller cavitation, wake flow, Reynolds stress model Citation: Gong, Z. X., Chen, Y., Li, J., Chen, X., Lu, C. J., 2020. Numerical study on the unsteady characteristics of the propeller cavitation in uniform and nonuniform wake flows. China Ocean Eng., 34(5): 688–696, doi: https://doi.org/10.1007/s13344-020-0062-0
1 Introduction Cavitation is usually inevitable for marine propellers under working condition and the cavity generation and collapse and its unsteady characteristics can cause performance losses, structure damage and other problems. Many works have been done on such subjects for several centuries. Arndt (1981), Kerwin (1986), Kumar and Saini (2010) generalized the fundamental concepts and influence factors in their review papers. Kinnas (1996) summarized that the propeller cavitation exhibits several forms, including bubble cavitation, sheet cavitation, cloud cavitation, tip vortex cavitation and so on. The sheet cavity dynamics and tip vortex cavity dynamics are the main source of vibration and noise. In order to control or reduce the negative effects of the propeller cavitation, it is crucial to master the m
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