LES大規模計算による風車翼の流れと騒音予測 : 第2報,翼端に着目した風車翼の空力騒音低減について(流体工学,流体機械)

概要

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The purpose of this research is to investigate the physical mechanisms associated with tip vortex noise caused by rotating wind turbines. The flow and acoustic field around the WINDMEL III wind turbine is simulated using compressible Large-Eddy simulation (LES), with emphasis on the blade tip region. The acoustic near field is simulated directly by LES whereas the far field is modeled using acoustic analogy. Due to the fine grid employed, smallest eddy scales near the blade surface are resolved. Aerodynamic performance and acoustic emissions are predicted for the actual tip shape and an ogee type tip shape. A decrease of the sound pressure level in the high frequency domain is observed for the ogee type tip shape, corresponding to field test measurements. The simulation results will contribute towards designing new wind turbine blades for reduced noise emission.
一般社団法人日本機械学会の論文
2005-01-25