Influences of fluid-structure coupled vibration effect on airfoil aerodynamic noise radiation

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (19) : 7-13.

JIANG ShuJie12,2 LIU FeiFei1,2 CHEN Gang2,3

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Abstract

In conventional aero-acoustic investigations, wing structures are usually treated as a rigid body not coupling with flow.Actually external flow induces wing structure’s vibration, and vibration causes flow field to change and aerodynamic noise variation.Neglecting this fluid-structure coupled vibration noise effect on wing structures with larger elasticity leads to numerical simulation results deviating from actual situations.In order to investigate influences of the fluid-structure coupled vibration effect on predicted results of aerodynamic noise, taking the NACA0012 airfoil model as a study object, the CFD/CSD coupled numerical method was used to solve unsteady responses of the airfoil flow field and the structure field, and evaluate the far-field radiated aerodynamic noise of the airfoil.The simulation results indicated that when considering fluid-structure interaction effects, the airfoil aerodynamic noise is significantly larger than that of the rigid body model, and the directivity of the noise source changes obviously; the vorticity analysis for the wing surface reveals that the wing vibration changes its surface pressure distribution and causes the turbulence kinetic energy to enhance on the wing surface, and make the wing aerodynamic noise radiation increase; the radiated aerodynamic noise of the elastic wing increases with decrease in its stiffness.

Key words

wing noise / fluid-structure interaction / large eddy simulation / FW-H equation

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JIANG ShuJie12,2 LIU FeiFei1,2 CHEN Gang2,3 . Influences of fluid-structure coupled vibration effect on airfoil aerodynamic noise radiation[J]. Journal of Vibration and Shock, 2018, 37(19): 7-13

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