Blade for e.g. wind turbine, has shorter cord and higher lift coefficient to reduce ratio of variable part of lift force to constant part

摘要

The blade profile is aerodynamically optimized to give a cord which is at least 10 (30)% shorter than that of a conventional profile, and which has a higher lift coefficient, so that the ratio of the variable part of the lift force to the constant part decreases. The profile has a 10 minute-averaged leading angle within the 0.5R-0.95R region which differs from the zero-lift angle by more than 12 (ca. 16) deg.