| 摘要 |
PROBLEM TO BE SOLVED: To prevent peeling of air flow by inflowing air at a proper inflow angle with respect to a blade surface over the substantially whole area in a radial direction.SOLUTION: A blade 21 of a propeller fan 110 includes a blade root part 34, a front edge part 22, a blade tip part 104, a rear edge part 24, a blade rear end part 105, and an outer edge part 23. The stagger angle in the blade root part 34 is smaller than the stagger angle in the outer edge part 23. The blade root part 34 of a blade surface 28 has such a shape that the positive pressure surface side of the blade surface 28 is a projection and the negative pressure side thereof is a recess. The blade 21 is formed so that the warp direction of the blade root part 34 and the warp direction of the outer edge part 23 are opposite to each other. |
