Wind turbine impeller installed with blown flap wing-like vane

Abstract

The invention provides a wind-turbine impeller provided with an air-jetting flap airfoil blade. On the airfoil tail edge of the blade or on the pressure face near the tail edge, for example, apart from the front edge at a distance of 80-100 percent of the airfoil string length, a row of air-jetting holes are drilled from the blade tip to the blade root or in a range with selected radius on the blades. The angle between the air-jetting direction and the airfoil string is controlled between 15 and 90 DEG. Using air-jetting to replace the function of the conventional flap improves the output power of the wind-turbine, lowers the starting wind-speed, enlarges the working range, as well as consumes no additional power, and lowers the electricity generating cost. The air-jetting is produced when the rotating centrifugal force of the blade sucks the air in front of a hollow wheel hub.

Description

technical field [0001] The invention relates to a wind turbine impeller equipped with airfoil blades of jet flaps, specifically a blade of a horizontal axis wind turbine with flaps generated by jet flow, and belongs to the field of design, manufacture and application of wind turbines. Background technique [0002] For decades, people have been pursuing how to improve the efficiency of wind energy utilization of wind turbines. US4197053 proposed a scheme that passively intakes air from the front of the hollow hub and then injects air from the trailing edge of the blades, which reduces the starting wind speed of the wind turbine. , thereby expanding the working range of the wind turbine. [0003] CN03134065.2 greatly broadens the scope of application of the above-mentioned technology. It considers the engineering needs, opens the air jet holes on the blades on the pressure surface, and the air jet direction is the tangential direction of the impeller rotation, which is the so-...

AI Technical Summary

Problems solved by technology

However, for blades with a theoretical thickness of 0 at the trailing edge, this technology is not easy to implement. For example, the structural strength of the Gurney flap when it is connected to the airfoil will bring new problems; and the Gurney flap obviously hinders the pressure The airflow on the surface of the blade flows, so while the lift increases, its resistance may increase even more; another important problem is that it is not easy to control, so there is a jet of air at a certain angle to the blade surface instead of The flap method, that's the jet flap

The effect of the jet flap is related to the position of the jet on the chord line of the airfoil, the direction of the jet and the size of the jet volume; since the jet volume can be controlled, the effect is better than that of the Gurney flap, and the jet volume is determined by The air source that produces the jet is used to control; the usual air source is a fan, of course, this requires additional energy consumption

Gurney flap technology is usually used on aircraft wings, helicopters and rotary impeller machinery, but all these applications (if any) are supplied by a dedicated fan, that is, active jets, which require additional energy consumption. energy

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