Abstract: 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 chord 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 chord 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 chord 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 chord length.

Abstract: In an integrated vane 1 for use in wind or water, main blades 3 arranged around an axial shaft 2 of the vane and support blades 4 for joining the main blades to the axial shaft are integrally formed with light and high strength fiber material such as glass fibers and carbon fibers. The main blade is symmetrical or asymmetrical in its cross sectional view and the support blade is symmetrical in its cross sectional view. The upper support blade may be asymmetrical in its cross sectional view and the lower support blade may have an up-and-down reversed shape of that of the upper support blade. A mountain-shaped portion may be formed at the ends of the main blade for reducing noise. The strength of crossing portions between the main and support blade of the vertical axis vane for use in wind or water is thus improved.

Abstract: In an integrated vane 1 for use in wind or water, main blades 3 arranged around an axial shaft 2 of the vane and support blades 4 for joining the main blades to the axial shaft are integrally formed with light and high strength fiber material such as glass fibers and carbon fibers. The main blade is symmetrical or asymmetrical in its cross sectional view and the support blade is symmetrical in its cross sectional view. The upper support blade may be asymmetrical in its cross sectional view and the lower support blade may have an up-and-down reversed shape of that of the upper support blade. A mountain-shaped portion may be formed at the ends of the main blade for reducing noise. The strength of crossing portions between the main and support blade of the vertical axis vane for use in wind or water is thus improved.

Abstract: In a fluid power generator system using operative fluid energy, a measured tip speed ratio and a reference tip speed ratio are compared with each other. If the measured tip speed ratio is smaller than the reference tip speed ratio, a generator is placed in a no-load state, thereby restoring the number of rotations of the wing axial shaft to the number of rotations corresponding to the reference tip speed ratio. Further, the operation of the generator is controlled on the basis of the tip speed ratio calculated from the flow rate of the fluid, thereby providing a maximum output for each flow rate. In this way, a change in the flow rate and number of rotations can be appropriately dealt with and the maximum output for each flow rate of the operative fluid can be dealt with, thereby increasing a quantity of generated power.

Abstract: A fluid power generator system includes an operating mode in which a continuously variable output corresponding to a wide range of a flow rate is given by selectively combining generators with optimum rated outputs from said plurality of generators according to natural fluid energy and the number of rotations of a wing axial shaft; and control means for controlling the operation of each of the generators on the basis of a tip speed calculated from the flow rate of the operative fluid and the number of rotations of said wing axial shaft, thereby acquiring a maximum output for specific flow rate of the operative fluid. In this configuration, the fluid power generator system using operative fluid energy as a driving source can generate a continuously variable output corresponding to a wide range of the flow rate of the fluid and provides a maximum output for an individual flow rate of the operative fluid, thereby increasing a quantity of generated power (by 40% or more than before).

Abstract: 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.

Abstract: A fluid power generator system includes an operating mode in which a continuously variable output corresponding to a wide range of a flow rate is given by selectively combining generators with optimum rated outputs from said plurality of generators according to natural fluid energy and the number of rotations of a wing axial shaft; and control means for controlling the operation of each of the generators on the basis of a tip speed calculated from the flow rate of the operative fluid and the number of rotations of said wing axial shaft, thereby acquiring a maximum output for specific flow rate of the operative fluid. In this configuration, the fluid power generator system using operative fluid energy as a driving source can generate a continuously variable output corresponding to a wide range of the flow rate of the fluid and provides a maximum output for an individual flow rate of the operative fluid, thereby increasing a quantity of generated power (by 40% or more than before).

Abstract: In an integrated vane 1 for use in wind or water, main blades 3 arranged around an axial shaft 2 of the vane and support blades 4 for joining the main blades to the axial shaft are integrally formed with light and high strength fiber material such as glass fibers and carbon fibers. The main blade is symmetrical or asymmetrical in its cross sectional view and the support blade is symmetrical in its cross sectional view. The upper support blade may be asymmetrical in its cross sectional view and the lower support blade may have an up-and-down reversed shape of that of the upper support blade. A mountain-shaped portion may be formed at the ends of the main blade for reducing noise. The strength of crossing portions between the main and support blade of the vertical axis vane for use in wind or water is thus improved.

Abstract: In a fluid power generator system using operative fluid energy, a measured tip speed ratio and a reference tip speed ratio are compared with each other. If the measured tip speed ratio is smaller than the reference tip speed ratio, a generator is placed in a no-load state, thereby restoring the number of rotations of the wing axial shaft to the number of rotations corresponding to the reference tip speed ratio. Further, the operation of the generator is controlled on the basis of the tip speed ratio calculated from the flow rate of the fluid, thereby providing a maximum output for each flow rate. In this way, a change in the flow rate and number of rotations can be appropriately dealt with and the maximum output for each flow rate of the operative fluid can be dealt with, thereby increasing a quantity of generated power.

Abstract: Wind power turbines are largely divided into vertical axis type wind power turbines and propeller type (horizontal axis type) wind power turbines. The present invention discloses a vertical axis type wind power turbine. The airfoil of blades in this vertical axis type wind power turbine is formed in such manner that, denoting a proper position on the airfoil chord line as a camber reversing position, a camber having a downward convex curvature is given between said position and a leading edge and a camber having an upward convex curvature is given between said position and a trailing edge so as to be a mean line and a rational thickness distribution is given to this mean line. This vertical axis type wind power turbine is formed by keeping the spanwise direction of the above mentioned blade parallel with a vertical rotary axis and fitting a plurality of blades at regular intervals at a distance to the vertical rotary axis through respective supporting arms.

Abstract: Wind turbines are largely divided into vertical axis wind turbines and propeller (horizontal axis) wind turbines. The present invention discloses a vertical axis high speed wind turbine provided with a starting and braking control system. This vertical axis wind turbine is formed by having blades of a proper airfoil fitted to respective supporting arms provided radially from a vertical rotary axis by keeping the blade span-wise direction in parallel with said axis and being provided with a low speed control windmill in which the radial position of each operating piece varies with a centrifugal force produced by the rotation of said vertical rotary axis.

Abstract: Wind turbines are largely divided into vertical axis wind turbines and propeller (horizontal axis) wind turbines. The present invention discloses a vertical axis high speed wind turbine provided with rotational speed control systems. This vertical axis wind turbine is formed by having blades of a proper airfoil fitted to respective supporting arms provided radially from a vertical rotating shaft by keeping the blade span-wise direction in parallel with the shaft and being provided with aerodynamic control elements operating manually or automatically to control the rotational speed of the turbine.