Shear stress and noise metric reduction using active vibration Online publication date: Fri, 02-Sep-2016
by Dawei Li; Jinhao Qiu; Hongli Ji; Rui Nie
Progress in Computational Fluid Dynamics, An International Journal (PCFD), Vol. 16, No. 5, 2016
Abstract: The effects of active vibrational surface on wall shear stress and noise metric have been researched by the computational fluid dynamics method. The skin-friction drag and noise metric can be decreased by the active surface control. A sinusoidal vibration was imposed on the surface of a plate and the vibrational position located on downstream of the plate leading edge. The turbulence boundary layer was fully developed at the vibrational position. The downstream skin-friction drag exhibited a strong dependence on the control parameters (oscillation frequency and amplitude). A reduction in the trailing edge noise was obtained by the increasing of vibrational frequency and the appropriate choosing of amplitude. The maximum reduction in local skin friction drag is 64.3%. The noise metric can be decreased by 37.9 dB. Comparing the near-wall flow structures with and without control, it can be found that the turbulent kinetic energy and characteristic turbulence length scale were changed by the control.
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