Prediction of hydrodynamic noise in ducted propeller using flow field-acoustic field coupled simulation technique based on novel vortex sound theory

Si, Qiaorui; Ali, Asad; Ding, Tian; Chen, Mengfei; Cheng, Xin; Yuan, Jianping

doi:10.1016/j.oceaneng.2023.113907

Cited by 10 publications

(5 citation statements)

References 36 publications

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“…In order to further study the ultrasonic field in the slit ultrasonic reaction chamber, the visualization effect of the distribution of sound field, flow field and temperature field were realized through the finite element simulation software COMSOL Multiphysics 5.6. According to previous studies, the distributions of sound field, flow field and temperature field were constructed and analyzed by the theory of piezoelectric effect [32] , [66] , [67] , acoustic flow effect [67] , [68] and ultrasonic thermal effect [69] , [70] .…”

Section: Methodsmentioning

confidence: 99%

Slit dual-frequency ultrasound-assisted pulping of Lycium barbarum fresh fruit to improve the dissolution of polysaccharides and in situ real-time monitoring

Kong

Liu

Feng

et al. 2023

Ultrasonics Sonochemistry

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Section: Methodsmentioning

confidence: 99%

Slit dual-frequency ultrasound-assisted pulping of Lycium barbarum fresh fruit to improve the dissolution of polysaccharides and in situ real-time monitoring

Kong

Liu

Feng

et al. 2023

Ultrasonics Sonochemistry

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“…When the number of meshes is greater than 5.42 million, the difference of mass flow rate between import and export remains almost constant with the increase of the number of meshes, and the relative error of the difference of flow rate between import and export is less than 2%. Relevant studies show [14] that when the relative error of the difference between the inlet and outlet flow is less than 2%, the influence of the number of grids can be ignored. Therefore, on the basis of ensuring the accuracy and cycle of simulation calculation, the second group mesh is selected for simulation.…”

Section: Geometric Models and Meshingmentioning

confidence: 99%

“…The results displayed that both methods could precisely predict the noise aroused by an unsteady fluid field. Through a mix of simulation and experimentation, Qiaorui Si et al [10] looked into the linking process between the DP fluid field and the sound field. They discovered that turbulent pulsation and eddy current, two no steady flows in the fluid field, were strongly associated with the production of fluid noise.…”

Section: Introductionmentioning

confidence: 99%

Sound Source Analysis of Blade Aerodynamic Noise of Megawatt Wind Turbine Based on Vortex Sound Theory

2024

AJETS

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Based on the analysis method of vortex sound theory, the mechanism of turbine blade aerodynamic noise generation is studied. In this paper, modeling and grid division of wind turbine blades and flow field areas are first carried out, and the directivity of wind turbine aerodynamic noise is analyzed by CFD (computational fluid dynamics) numerical simulation calculation. Through test verification, it is concluded that wind turbine aerodynamic noise is a dipole characteristic, and the accuracy of numerical simulation is verified. Then, the distribution of flow field and sound field calculated by numerical simulation are analyzed and compared, and the main causes of wind turbine blade aerodynamic noise are studied. The results show that the aerodynamic noise sources of wind turbine blades are mainly distributed in 65%~95% span of the blade spanwise direction. At the same time, the sound source of wind turbine blade aerodynamic noise is mainly caused by vortex movement caused by fluid movement, and the distribution law of vortex movement in the range of 65%~95% of blade span is very consistent with the distribution law of blade aerodynamic noise.

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“…The transient characteristics under linear and exponential startup modes were analyzed. Si et al [17] investigated the coupling mechanism between the ducted-propeller (DP) flow field and the acoustic field and developed a three-dimensional flow-acoustic coupling numerical model based on the vortex acoustics equation. By combining simulation and experimental research, they studied the unsteady flow field of the DP configuration.…”

Section: Introductionmentioning

confidence: 99%

“…Si et al [17] They developed a three-dimensional flow-acoustic coupling numerical model based on the vortex acoustics equation.…”

mentioning

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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Prediction of hydrodynamic noise in ducted propeller using flow field-acoustic field coupled simulation technique based on novel vortex sound theory

Cited by 10 publications

References 36 publications

Slit dual-frequency ultrasound-assisted pulping of Lycium barbarum fresh fruit to improve the dissolution of polysaccharides and in situ real-time monitoring

Slit dual-frequency ultrasound-assisted pulping of Lycium barbarum fresh fruit to improve the dissolution of polysaccharides and in situ real-time monitoring

Sound Source Analysis of Blade Aerodynamic Noise of Megawatt Wind Turbine Based on Vortex Sound Theory

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

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