| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a device and method for reducing airflow noise, whereby a low noise type windmill is materialized by reducing airflow noise during operation. <P>SOLUTION: This device is provided with: a detecting means 10 to detect occurrence of air noise; a boundary layer control means A1 to control the boundary layer of airflow flowing along a blade 2; and a control means 37 to actuate the boundary layer control means A1 in response to the output signal of the detecting means 10. <P>COPYRIGHT: (C)2003,JPO |
