| 摘要 |
A Straight blade type turbine has at least one two-dimensional blade positioned in parallel with and around a central axis of the turbine. The two-dimensional blade has a cross section with a blade cord turned around a center of the two-dimensional blade by an angle of 3° to -2° relative to a line perpendicular to another imaginary line connecting the central axis with the center of the two-dimensional blade. A distance between a fore end and the center of the cross section is 15 to 40 percent of a cord length of the blade. NC/R, which is calculated by a radius R extending from the axis to the center of two-dimensional blade, the cord length C, and the number N of the two-dimensional blades, is between 0.5 and 2.2. A maximum thickness of the two-dimensional blade is between 20 and 25 percent of the cord length. The turbine has a strut blade having a symmetric cross section joining the two-dimensional blade to a side of the central axis, the strut blade having a maximum thickness which is between 15 and 20 percent of a cord length of the strut blade.
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