Study on Noise Reduction Mechanism of Flow Induced Noise for Flexible Body Based on Fluid-structure Interaction

doi:10.3901/JME.2016.10.176

Abstract

Abstract: The flow induced noise by the interaction between structure and fluid for rudder is one of dominant sources of hydrodynamic noise, featured by broadband noise, which is difficult to be controlled by ordinary noise reduction measures, but a solution is provided by flexible rudder. The unsteady flow field and flow induced noise of a flexible NACA0018 airfoil are simulated using large eddy simulation method, along with the FW-H equation which considers the arbitrary boundary movement. The interaction between flexible body and fluid is taken into account by weak coupling method. Then the influence of airfoil’s flexible deformation on flow field, noise source, and sound radiation characters under different attack angles are analyzed systematically. The simulation results show that flow separation is postponed by the deformation, turbulence region is contracted, and wall pressure fluctuation is suppressed. The sound source intensity of transitional boundary-layer and turbulent flow are decreased, and it is reduced for laminar flow under large angle of attack, but increased under small attack angle. With attack angle increasing the radiated far-field overall sound pressure level varies in different ways in chord-length and normal directions, and their sound frequency properties are also affected by the flexible deformation unlikely.

Key words: flexible body, flow induced noise, fluid-structure interaction, FW-H equation, large eddy simulation

CLC Number:

U674

LIU Zhansheng, MA Ruixian, YANG Fan, ZHANG Guanghui. Study on Noise Reduction Mechanism of Flow Induced Noise for Flexible Body Based on Fluid-structure Interaction[J]. Journal of Mechanical Engineering, 2016, 52(10): 176-184.

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