| 摘要 |
PROBLEM TO BE SOLVED: To provide a low noise blade capable of reducing discrete frequency noise without deteriorating aerodynamic performance of a blade, and a low noise blade device using the low noise blade.SOLUTION: In a low noise blade, at a blade cord directional position closer to a rear edge R to the middle point of a blade chord line L, formed is a rear end surface RS perpendicular to the blade chord line L. The ridge line between a negative pressure surface Sof the low noise blade and the rear end surface RS is subjected to R chamfering.SELECTED DRAWING: Figure 1 |
