Reducing underwater radiated noise of a SUBOFF model propelled by a pump-jet without tip clearance: Numerical simulation

Huang, Xiuchang; Shi, Shuaikang; Su, Zhen; Tang, Wanghao; Hu, Hua

doi:10.1016/j.oceaneng.2021.110277

Cited by 16 publications

(2 citation statements)

References 25 publications

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“…It is shown that the contribution of the distributed forces on rotors is dominant. Huang et al (2022) investigated the hydrodynamic performance of a pump-jet without tip clearance, modal characteristics, and vibro-acoustic responses of coupled pump-jet-SUBOFF system, which were verified with experimental results in a cavitation tunnel. It is shown that the sound radiation power level is evidently reduced after eliminating the tip clearance.…”

Section: Introductionmentioning

confidence: 86%

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Vibro-acoustic characteristics of a submarine model excited by excitation forces of pump-jet duct

Zhang

2023

Journal of Vibration and Control

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The vibro-acoustic responses of coupled pump-jet-submarine systems excited by fluid excitations on the wall of the duct are numerically investigated. The unsteady excitations are calculated by computational fluid dynamics and the vibration responses for different excitations on the inner and outer walls are contrastively analyzed through establishing a finite element model of the coupled system. Meanwhile, the effect of fluid–structure interaction and the excitation loading methods for the inner flow of duct are considered. The sound radiation characteristics for different excitation sources are predicted through using a boundary element model. The results show that the excitation force spectra of the inner wall have a remarkable discrete peak at blade passing frequency and its multiple, while the excitation force spectra of the outer wall show a broadband characteristic and discrete components appear at blade passing frequency. The modes of hull both dominate the vibro-acoustic responses of the coupled system for different excitation sources of the duct. The transmitted energy for inner excitation forces is significantly greater than that of outer excitation forces, but the sound radiation efficiency is relatively close. The excitations of the duct can transfer to the thrust bearing through stators as well as the hull and cause a coupled vibration between the duct–stator–hull and the shafting system. Besides, the method for applying distributed forces on the inner wall is more reliable.

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Section: Introductionmentioning

confidence: 86%

“…The radiated pressure on the hull and field points is obtained by directed BEM (Huang et al, 2022):where m,n are the number of field points and surface nodes; k is the node index of element on the structural boundary; uik is the velocity response on structural surface; aijk,bijk,eijk are the BEM coefficients; and pj is the pressure.…”

Section: Model Formulationmentioning

confidence: 99%

Vibro-acoustic characteristics of a submarine model excited by excitation forces of pump-jet duct

Zhang

2023

Journal of Vibration and Control

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Experimental and numerical investigation of the impacts of rotor tip-rake on excitation forces of pump-jet propulsors

Ji,

Zhang,

Yang

et al. 2024

J Hydrodyn

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The tip-clearance flow in a pump-jet propulsor exerts great impacts on the fluctuating pressures and resultant unsteady forces, which are important sources of structural vibrations and radiated noise underwater. The blade geometry close to the tip is an important factor determining the vortex strength in the tip-clearance flow. In the open-water condition, the effects of raking the rotor tips on duct-surface fluctuating pressures and the resultant unsteady forces acting on different components of the propulsor are investigated via physical model experiments and the numerical solution of Reynolds-Averaged Navier-Stokes equations coupled with the SST k- turbulence model. The measured and simulated results of hydrodynamic pressures are consistent to each other, and the simulated flows help better understand why the fluctuating pressures change with the tip geometry. The strong fluctuations of duct-surface pressures are caused by intensive tip separation vortices. The duct-surface pressure fluctuations are effectively reduced by using the rake distribution near the tip towards blade back side and, for the combination of the five-bladed rotor and the seven-bladed stator, the resultant unsteady horizontal (and vertical) forces acting on the duct and stator are also reduced. While increasing rake leads to negative effect on pressure fluctuations and unsteady horizontal (and vertical) forces acting on all the components of the propulsor.

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Smooth average properties of vibroacoustic radiation of a shaft-hull system in shallow sea

Duan,

Zhang,

Sun

et al. 2024

Engineering Analysis with Boundary Elements

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Reducing underwater radiated noise of a SUBOFF model propelled by a pump-jet without tip clearance: Numerical simulation

Cited by 16 publications

References 25 publications

Vibro-acoustic characteristics of a submarine model excited by excitation forces of pump-jet duct

Vibro-acoustic characteristics of a submarine model excited by excitation forces of pump-jet duct

Experimental and numerical investigation of the impacts of rotor tip-rake on excitation forces of pump-jet propulsors

Smooth average properties of vibroacoustic radiation of a shaft-hull system in shallow sea

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