| 摘要 |
PURPOSE: A root airfoil of a blade for a wind power generator is provided to form a blade root airfoil shape on a camber line so as to have at least one inflection point, thereby increasing the strength, delaying the flow separation at the low angle of attack, and improving the driving torque. CONSTITUTION: A root airfoil of a blade for a wind power generator includes a leading edge (1), a trailing edge (2), which is formed to have a space between itself and the leading edge, and an upper surface (3) and a lower surface (4) which are formed between the leading edge and the trailing edge. The root air foil (10) is formed in a shape, that an inflection point (9) for increasing the lift-to-drag ratio is included, by delaying the flow separation to the trailing edge on the camber line, which connects the centers on the upper surface and the lower surface in order, even at the low angle of attack. The root airfoil is the inside portion of the blade which is within 40% of the blade radius direction. [Reference numerals] (AA) Airfoil with a thickness ratio of 30% |
