Predicting the dipole noises of the marine propeller with verifications by experimental measurements

Kao, Jui-Hsiang; Lin, Yao-Chian

doi:10.1016/j.oceaneng.2020.107451

Cited by 8 publications

(3 citation statements)

References 12 publications

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“…It is generally recognized that the main sources of discrete noise in turbomachinery include the strong dynamic and static interference between the wake of the internal impeller rotor and the guide vanes, volute tongue, and other stationary components as well as the phenomenon of vortex shedding when the laminar boundary layer passes over the trailing edge of the blades, resulting in intense fluctuation of surface pressure and the generation of discrete tonal noise [2]. Jui-Hsiang Kao et al [3] used a combination of the CFD method and linear wave theory to solve the dipole noise of marine propeller radiation. Qin Wu et al [4] predicted loading noise and cavitation noise based on the fan source theory and spherical bubble acoustic radiation theory, respectively.…”

Section: Introductionmentioning

confidence: 99%

Research on the Hydrodynamic Noise Characteristics of a Mixed-Flow Pump

Yang,

Li,

et al. 2023

JMSE

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This study presents a comprehensive investigation of the internal noise characteristics of a mixed-flow pump by combining computational fluid dynamics (CFD) and computational acoustics. The turbulent flow field of the pump is simulated using the unsteady SST k-ω turbulence model in CFD. The contributions of the volute, guide vanes, and impeller to the internal noise are analyzed and compared using the Lighthill theory, FW-H formula, and LMS Virtual Lab software for acoustic simulation. The research findings indicate that the energy of pressure fluctuations in the mixed-flow pump is predominantly concentrated at the blade passing frequency and its low-frequency harmonics. This suggests that the internal noise is mainly in the low-frequency range, with higher energy at the blade passing frequency and its harmonics. Under the 0.6Qdes flow condition, the flow inside the pump becomes more complex, resulting in higher sound pressure levels and sound power levels compared to higher flow conditions. However, for flow conditions ranging from 0.8Qdes to 1.2Qdes, the sound pressure levels gradually increase with increasing flow rate, with the sound pressure level at 1.0Qdes being nearly identical to that at 1.2Qdes. The analysis of sound power level spectra at different flow rates reveals that the distribution characteristics of internal vortex structures directly impact the hydrodynamic noise inside the mixed-flow pump. These research findings provide a significant theoretical basis for noise control in mixed-flow pumps.

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Section: Introductionmentioning

confidence: 99%

Research on the Hydrodynamic Noise Characteristics of a Mixed-Flow Pump

Yang,

Li,

et al. 2023

JMSE

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“…Bretschneider et al [9] present a detailed overview of underwater noise sources. Within the flow-induced noise category, propeller noise is one of the most relevant sources [4,[9][10][11][12], classified as cavitating and noncavitating propeller noise. Cavitation noise is caused by the collapse of cavitation bubbles [11] and is the predominant source when the propeller is cavitating [4,9,13].…”

mentioning

confidence: 99%

“…Cavitation noise is caused by the collapse of cavitation bubbles [11] and is the predominant source when the propeller is cavitating [4,9,13]. For noncavitating propellers, e.g., oceanography research ships, submarines at diving depth, and warships [12], the propeller noise can have tonal or broadband nature and is mainly caused by unsteady hydrodynamic forces generated on the propeller [10,11]. The broadband sound is generated as a result of upstream flow disturbances causing leadingedge noise and turbulence developed on the blade surface leading to trailing-edge noise.…”

mentioning

confidence: 99%

Modeling the Turbulence Spectrum Dissipation Range for Leading-Edge Noise Prediction

et al. 2022

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Noise pollution caused by inflow turbulence is a major problem in many applications, e.g., propellers and fans. The Amiet leading-edge noise prediction model is widely applied in the design of silent propellers and fans, strongly relying on the accuracy of the inflow turbulence spectrum. The von Kármán energy spectrum accurately models the energy-containing range and inertial subrange of the turbulence spectrum. However, this model does not incorporate the dissipation range of the turbulent energy and leads to incorrect far-field noise estimates in the high-frequency range. In this study, empirical formulations are presented for the dissipation frequency and the dissipation range based on experimental data. Two passive grids were used to generate nearly isotropic inflow turbulence, which was characterized by hot-wire anemometry. These results showed that the dissipation frequency depends on the intensity of the velocity fluctuations and on the freestream velocity. The expressions proposed to predict the dissipation frequency and the dissipation range had a fairly good agreement with the measured data in this research and with experimental data from the literature. The predicted leading-edge noise is significantly affected by the dissipation range, causing a decrease in level of up to 17 dB for the highest frequencies.

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Computational fluid dynamics driven surrogate model to predict hydrodynamic and acoustic properties of propeller boss cap fins

Liu,

Yu,

et al. 2024

Applied Ocean Research

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Predicting the dipole noises of the marine propeller with verifications by experimental measurements

Cited by 8 publications

References 12 publications

Research on the Hydrodynamic Noise Characteristics of a Mixed-Flow Pump

Research on the Hydrodynamic Noise Characteristics of a Mixed-Flow Pump

Modeling the Turbulence Spectrum Dissipation Range for Leading-Edge Noise Prediction

Computational fluid dynamics driven surrogate model to predict hydrodynamic and acoustic properties of propeller boss cap fins

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