Flow guide device for vertical axis wind turbine

Abstract

This invention provides a vertical axis wind turbine airflow guiding device, comprising: a plurality of arc-shaped airflow guiding channels, each of which has an air inlet and an air outlet. Each arc-shaped airflow guiding channel is disposed in the upwind side region with the rotation axis of the wind turbine blade as the center and larger than the rotation radius of the wind turbine blade. The positions of the plurality of arc-shaped airflow guiding channels are equally divided into arc intervals from 0° to 75° corresponding to the rotation area of ​​the wind turbine blade. The air outlet of each arc-shaped airflow guiding channel is designed such that the airflow direction is tangential to the tangential direction of the end of the wind turbine blade, thereby converting the resistance on the upwind side into rotational thrust to improve the rotational efficiency of the wind turbine blade.

Claims

1. A flow guiding device for a vertical axis wind turbine, operating on a vertical axis wind turbine having a plurality of blades and a rotating shaft. The plurality of blades are arranged in a circle around the rotating shaft, and the angle between the tangent and the normal at the tip of each blade is θ. The flow guiding device comprises: a plurality of arc-shaped flow guide channels, a downwind arc-shaped flow guide channel, and a plurality of mirror-image arc-shaped flow guide channels. Each of the arc-shaped flow guide channels is located on the upwind side of the windward face of the vertical axis wind turbine. The number of arc-shaped flow guide channels is n, where n is an integer greater than or equal to 3. Each arc-shaped flow guide channel has an inlet and an outlet, wherein the tangent direction of the inlets is in the same direction as the wind direction, and the outlets correspond to the blades located at corresponding positions on the upwind side of the rotating shaft. The air outlets of these arc-shaped guide channels are arranged on the windward side of the rotation axis, and are equally divided along an arc segment on the windward side. This arc segment is a fan-shaped area centered on the rotation axis. The angle ϕ of this arc segment ranges from 0° to 75°. This angle ϕ is the angle range formed by measuring from the wind direction towards the windward side of the vertical axis wind turbine to the line connecting each of the air outlets and the rotation axis. The radius of the arc-shaped guide channel centered on the rotation axis of the vertical axis wind turbine is R, k is the sequence number of the arc-shaped guide channel from the wind direction, the arc angle of the k-th arc-shaped guide channel is αk, and the arc radius rk of the k-th arc-shaped guide channel satisfies αk = θ + ((k-1) / (n-1)) × ϕ). rk = R × (k / n - sin((k-1) / (n-1) × ϕ)) / (1 - cos(αk)), where: the coordinates of the outlet of each arc-shaped guide channel are: (-R × sin((k-1) / (n-1) × ϕ), R × cos((k-1) / (n-1) × ϕ)); the coordinates of the inlet of each arc-shaped guide channel are: (-(k / n) × R, R × cos((k-1) / (n-1) × ϕ) + rk × sin(αk)); and the coordinates of the center of each arc-shaped guide channel are: (-(k / n) × R + rk, R × cos((k-1) / (n-1) × ϕ) + rk × sin(αk)). rk×sin(αk)); where the downwind side circular arc guide channel is set on the downwind side of the rotation area of ​​the vertical axis wind turbine blade, the angle between the outlet tangent of the downwind side circular arc guide channel and the wind direction is αS, which satisfies: αS = (ϕ / (n-1)) + 90° - θ; the radius of the downwind side circular arc guide channel is rS, which satisfies: rS = (R + (R / n) - R×cos(ϕ / (n-1))) / (1 - cos(αS)); these mirror circular arc guide channels are set corresponding to another opposite wind direction, and are mirror symmetrically configured with the circular arc guide channels set in the original windward direction.

2. The vertical axis wind turbine guide device as described in claim 1 further includes an extended arc guide channel disposed beside the plurality of arc guide channels. The angle between the outlet tangent of the extended arc guide channel and the wind direction is α(n+1), which satisfies: α(n+1) = θ + (n / (n-1))×ϕ; the radius r(n+1) of the extended arc guide channel satisfies: r(n+1) = (R×(((n+1) / n) - sin((n / (n-1))×ϕ))) / (1 - cos(α(n+1))).

3. The vertical axis wind turbine guide device as described in claim 1 further includes a rotating platform on which the arcuate guide channels are disposed, the rotating platform being centered on the rotation axis.

4. The vertical axis wind turbine guide device as described in claim 2, wherein the coordinates of the outlet of the extended arc guide channel are: (-R×sin((n / (n-1))×ϕ), R×cos((n / (n-1))×ϕ)); the coordinates of the inlet of the extended arc guide channel are: (-((n+1) / n)×R, R×cos((n / (n-1))×ϕ) + r(n+1)×sin(α(n+1))); the coordinates of the center of the extended arc guide channel are: (-((n+1) / n)×R + r(n+1), R×cos((n / (n-1))×ϕ) + r(n+1)×sin(α(n+1))).

5. The vertical axis wind turbine guide device as described in claim 1, wherein the center coordinates of the downwind side arc guide channel are: (R + (R / n) - rS, -R×sin(ϕ / (n-1)) + rS×sin(αS)); the outlet coordinates of the downwind side arc guide channel are: (R×cos(ϕ / (n-1)), -R×sin(ϕ / (n-1))); and the inlet coordinates of the downwind side arc guide channel are: (R + (R / n), -R×sin(ϕ / (n-1)) + rS×sin(αS)).

6. The vertical axis wind turbine guide device as described in claim 3, wherein the rotating platform is adjusted in a timely manner by detecting the wind direction to align with the wind direction, so that the arc-shaped guide channels are always kept in the optimal position in the upwind side region of the vertical axis wind turbine.

Images