風力発電システムで観察された強い空力離散周波数音 (<小特集>流体関連振動・騒音等)

概要

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An unexpected strong noise with high frequency components has been observed during a test operation of wind turbine rotor blades which were produced to have a sharp trailing edge and smooth surface for acoustic noise experiments. Acoustic measurements to investigate this noise have been carried out under various operating conditions, and the results were compared with those of the previous work. It was found that the noise was composed of intense discrete tones whose frequencies were distributed in the range approximately predicted by Fink's model based on the T-S instability wave over a flat plate. The level of the noise depended on the electricity output of the test machine: The level was high at high power output, while the noise was generated intermittently at low power output. It was also found that noise was suppressed by attaching tripping tape on the pressure side of the blades. It was belived that T-S instability wave developed in a laminar boundary layer was responsible for the generation of the observed tones.
社団法人日本機械学会の論文
1999-07-25