Cavitation tunnel analysis of radiated sound from the resonance of a propeller tip vortex cavity

Pennings, P.C.; Westerweel, J.; Terwisga, Tom van

doi:10.1016/j.ijmultiphaseflow.2016.03.004

Cited by 47 publications

(5 citation statements)

References 6 publications

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“…Whereas at 250 mm Hg, the frequency shifted to the lower region between 50 and 1000 Hz with a higher maximum SPL of 119 dB. This unique sound profile of the tip vortex cavitation supported the finding by Pennings, et al [18,19] where the same sound signature was obtained.…”

Section: Urn Measurementsupporting

confidence: 86%

Underwater radiated noise characteristic of the hydro-spinna tidal turbine under induced cavitation

Rosli

Shi²,

Aktas³

et al. 2019

SGCE

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Over the past decade, the development of marine current turbines has progressed rapidly with prototypes and fullscale devices being deployed in the actual environment. With research focusing on the hydrodynamic and design aspects of the technologies used, little is known of the impact of marine current turbine operation on marine life and the environment. This paper looks at the Underwater Radiated Noise (URN) produced from the operation of the Hydro-Spinna turbine which is a horizontal-axis type concept design under development at Newcastle University. URN measurements were taken from a 280 mm diameter Hydro-Spinna model. The URN measurement was part of a comprehensive investigation conducted on the turbine model, where the local pressure in the tunnel was reduced to induce cavitation to study its characteristics. The noise data was found to correspond to the cavitation observation where the noise increases as more cavitation developed. In addition, only tip vortex cavitation was observed during the investigation indicating that this is the only cavitation characteristic of the Hydro-Spinna turbine. As more tip vortex cavitation was observed, the URN results exhibit an apparent trend, whereby the sound pressure level (SPL) increased and the frequency shifted towards the lower frequency region.

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Section: Urn Measurementsupporting

confidence: 86%

Underwater radiated noise characteristic of the hydro-spinna tidal turbine under induced cavitation

Rosli

Shi²,

Aktas³

et al. 2019

SGCE

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“…However, the lower sound levels in the medium frequencies between 0.1 and 3 kHz as a result of activating cavitation is unexpected. Although similar tendencies have been reported from measurements before [29]. The decrease of the sound levels by activating cavitation in the simulation could be facilitated by the following mechanisms:…”

Section: Noise Generation Mechanismssupporting

confidence: 84%

Application of Large Eddy Simulation to Predict Underwater Noise of Marine Propulsors. Part 2: Noise Generation

Kimmerl

Mertes

Abdel‐Maksoud

2021

JMSE

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Methods to predict underwater acoustics are gaining increased significance, as the propulsion industry is required to confirm noise spectrum limits, for instance in compliance with classification society rules. Propeller–ship interaction is a main contributing factor to the underwater noise emissions by a vessel, demanding improved methods for both hydrodynamic and high-quality noise prediction. Implicit large eddy simulation applying volume-of-fluid phase modeling with the Schnerr-Sauer cavitation model is confirmed to be a capable tool for propeller cavitation simulation in part 1. In this part, the near field sound pressure of the hydrodynamic solution of the finite volume method is examined. The sound level spectra for free-running propeller test cases and pressure pulses on the hull for propellers under behind ship conditions are compared with the experimental measurements. For a propeller-free running case with priory mesh refinement in regions of high vorticity to improve the tip vortex cavity representation, good agreement is reached with respect to the spectral signature. For behind ship cases without additional refinements, partial agreement was achieved for the incompressible hull pressure fluctuations. Thus, meshing strategies require improvements for this approach to be widely applicable in an industrial environment, especially for non-uniform propeller inflow.

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“…When exposed to higher pressure; the cavities implode and can produce an intense shock wave, [29]. It causes mechanical damage ( Figure 2) to turbine blades and diminishes its performance, the coefficient of lift to reduce and coefficient of drag to increase [30][31]. The cavitation phenomenon principally depends on the pressure coefficient, the local minimum CPmin of the blade section and the cavitation number.…”

Section: Requirement and Hydrofoil Design Characteristicsmentioning

confidence: 99%

Design and Hydrodynamic Performance of a Horizontal Axis Hydrokinetic Turbine

Nachtane¹,

Tarfaoui²,

Moumen³

et al. 2019

IJAME

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Marine energy is gaining more and more interest in recent years and, in comparison to fossil energy, is very attractive due to predictable energy output, renewable and sustainable, the Horizontal Axis Hydrokinetic Turbine (HAHT) is one of the most innovative energy systems that allow transforms the kinetic energy into electricity. This work presents a new series of hydrofoil sections, named here NTSXX20, and was designed to work at different turbine functioning requirement. These hydrofoils have excellent hydrodynamic characteristics at the operating Reynolds number. The design of the turbine has been done utilising XFLR5 code and QBlade which is a Blade-Element Momentum solver with a blade design feature. Tidal current turbine has been able to capture about 50% from TSR range of 5 to 9 with maximum CPower of 51 % at TSR=6,5. The hydrodynamics performance for the CFD cases was presented and was employed to explain the complete response of the turbine.

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Cavitation tunnel analysis of radiated sound from the resonance of a propeller tip vortex cavity

Cited by 47 publications

References 6 publications

Underwater radiated noise characteristic of the hydro-spinna tidal turbine under induced cavitation

Underwater radiated noise characteristic of the hydro-spinna tidal turbine under induced cavitation

Application of Large Eddy Simulation to Predict Underwater Noise of Marine Propulsors. Part 2: Noise Generation

Design and Hydrodynamic Performance of a Horizontal Axis Hydrokinetic Turbine

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