Effect of Vortex Induced Vibrated Cylinder on the Aerodynamic Performance of Airfoil

doi:10.3901/JME.2022.06.242

Abstract

Abstract: To delay the flow separation of the blade and increase the aerodynamic performance further, a passive flow control method is proposed by installing elastic steel wire near the leading edge of the blade. The 2D form of the above problem by installing an elastically mounted rigid cylinder in the vicinity of the NACA0012 leading edge is preliminarily studied. The problem of vortex induced vibration is numerically simulated by using ANSYS Fluent and its user-defined functions. With the focus on the cylinder at the resonate state, the effect of the diameter and the spacing between two components on airfoil aerodynamic performance is investigated. The results show that at high AoAs, when appropriate geometric and location parameters of cylinder are adopted, the static stall can be effectively delayed, thus improving aerodynamic performance. However, when at a small angle of attack the control effect is basically negative. Secondly the aerodynamic performance of the controlled airfoil when the cylinder in non-resonance state is also investigated and compared with the resonance one. It is found that the resonance one goes through a smaller range of AoAs that lift coefficient can suddenly drop in the initial stage of the stall, thus improving the stability of the airfoil. Among other AoAs there is no big difference in lift and drag coefficients between resonance one and non-resonance one. Related research results can hopefully provide guidance for the research and application of the flow control method of arranging tiny cylinder on the leading edge of the airfoil.

Key words: vortex-induced vibration, flow control, aerodynamic performance, micro-cylinder, wind turbine

CLC Number:

TK89

SUN Zhujun, XU Bin, HUANG Diangui. Effect of Vortex Induced Vibrated Cylinder on the Aerodynamic Performance of Airfoil[J]. Journal of Mechanical Engineering, 2022, 58(6): 242-252.

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