Numerical simulation of the flow-induced noise in a water-jet pump based on the Lighthill acoustic analogy theory

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (10) : 278-287.

ZHANG Desheng1, ZHANG Naishu1, XU Bin1, ZHAO Ruijie1, GAO Xiongfa1, LI Ning2

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Abstract

The unsteady flow in a water jet pump has an important influence on the stability and noise level of a ship propulsion system.In order to study the flow characteristics and the principle of flow induced noise under multiple operating conditions, the methods of computational fluid dynamics (CFD) and computational acoustics (CA) were used to simulate the operation of the water jet pump, and the existing experimental results of external characteristics were verified.The calculation results are in good agreement with the experimental data, which verifies the reliability of the numerical calculation.The numerical simulation on the unsteady flow of the water jet pump was carried out by using the SST turbulence model, and the CGNS files, where the rotating dipole on the impeller surface and the fixed dipole on the guide vane surface were used as the sound source file.The BEM method was used to calculate the interior sound filed and the acoustic and vibration coupling of the external sound field.The results of the simulation show that the amplitude of pressure fluctuation of the water jet pump decreases gradually from the inlet of the impeller to the outlet of the guide vane.Under the designed operating condition, the maximum value of the pressure fluctuation coefficient in the water jet propulsion pump appears at the blade pass frequency.With the decrease of flow rate, the pressure fluctuation at some monitor points in the low frequency range exceeds the value at the blade pass frequency.And with the decrease of flow rate, the amplitude of pressure fluctuation and the acoustic power of interior sound field increase, and the sound pressure level of acoustic and vibration coupling in external sound field also increases and shows obvious dipole characteristics.The research provides a theoretical basis for the low vibration and low noise design and operation of water jet pumps.
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water jet pump / Lighthill acoustic analogy theory / boundary element method（BEM） / vortex flow / noise

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ZHANG Desheng1, ZHANG Naishu1, XU Bin1, ZHAO Ruijie1, GAO Xiongfa1, LI Ning2. Numerical simulation of the flow-induced noise in a water-jet pump based on the Lighthill acoustic analogy theory[J]. Journal of Vibration and Shock, 2021, 40(10): 278-287

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