Separation Suppression Effect of Vortex Generators on an Airfoil for Wind Turbines

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  • 風車翼型におけるボルテックスジェネレータの剥離抑制効果

Description

For the purpose to design Vortex generator（VG) for a wind turbine blade by numerical simulation, the prediction accuracy of the fluid analysis soft, OpenFOAM which is open source software was examined. The subject is the airfoil widely used in wind turbine. At the angle of attack which causes separation on blade surface, the change of blade surface pressure coefficient depending on the VG was compared with the existing experimental results. For the analysis, “simpleFoam” which is the three dimensional, steady-state, incompressible flow simulation module based on the SIMPLE method was used, and “k-ω SST model” was selected as a turbulence model. For generation of computational grid, blockMesh which is the multiblock grid generation soft of OpenFOAM and snappyHexMesh which is grid generation soft adaptable to complex shape were used. The height of VG was designed to be same as the boundary layer thickness. The parameter of near wall boundary was set in this analysis so that about 10 grid points enter in VG height direction. As the result of simulation, it was shown that the vortex of different rotation direction which is characteristic of Counterrotation configuration was generated from VG and the pressure rise due to separation on suction surface was suppressed by the attachment of VG and it turned out that VG effect was qualitatively predictable by using OpenFOAM.

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