Rotor blade
AssigneeKabushiki Kaisha Bellsion
InventorMasahiko SUZUKI
Life of this patent
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Abstract
A rotor blade for a wind power generator which is a lift type blade having a wide chord length at a blade end portion. The rotor blade (1) comprises a side surface with a thickness that gradually decreases from a blade root (1A) to a blade end portion, and a front surface (1D) which gradually inclines in a direction of a back surface (1E) from the blade root (1A) to the blade end portion. Owing to a difference in the thickness, a speed of airflow passing in a chord direction at the blade root, when the rotor blade is rotating, increases at the blade end portion, and air pressure at the blade root is reduces at the blade end portion, and airflow concentrating, due to the reduction of the air pressure at the blade root, naturally moves to the blade end portion due to a difference in the air pressure.
Claims10
A rotor blade which is a lift type blade having a chord length gradually increased from a blade root to a blade end portion, comprising:
- a leading edge of which a maximum thickness is gradually decreased from the blade root to the blade end portion in a side view;
- a front surface gradually inclined in a direction of a back surface from the blade root to a maximum chord length portion;
- and
- an inclined portion formed of a blade end portion which is inclined in a front surface direction from the maximum chord length portion,
- wherein an airflow is directed from the blade root to the maximum chord length portion at where an air pressure is decreased when rotating.
Dependencies are inferred from the claim text.