A104 A Study on Flow analysis and Performance of Straight Wing Vertical Axis Wind turbine (5)

Horiuchi, Kenji; Sagara, Keita; Seki, Kazuichi

doi:10.1299/jsmepes.2012.17.9

Cited by 1 publication

(1 citation statement)

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“…When the structure was placed in the negative region of y, the returning blade traveled in the low-speed wake region behind the structure. According to several previous studies [20,21], the blades of straight-bladed vertical-axis wind turbines generate a negative torque at azimuth angles θ = 0-30 • when moving against the flow. Therefore, it was estimated that the installation of a flat-plate add-on upstream of the wind turbine in the negative region of y moderates the negative torque acting on the blades effectively by slowing down the velocity in the mainstream direction in the region where the negative torque is generated, thus mitigating the power reduction.…”

Section: Low-speed Effects Produced By Flat-plate-type Structuresmentioning

confidence: 99%

Power Output Enhancement of Straight-Bladed Vertical-Axis Wind Turbines with Surrounding Structures

Watanabe,

Matsumoto,

Nwe

et al. 2023

Energies

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Wind tunnel experiments were conducted by installing wind-acceleration structures on both sides of a straight-bladed vertical-axis wind turbine (VAWT) to improve the output performance of the turbine. In the case of Venturi-shape structures, a curved shape with a large outlet opening produced a higher power output than straight or brimmed Venturi shapes. More importantly, two simple flat plates installed upstream of the wind turbine achieved the highest power enhancement of 2.4 times the power of the bare wind turbine. From the analysis of the flow visualization results, the power enhancement was attributed to the increase in lift force on the blades in the upstream region due to the acceleration of the gap flow between the flat plates, and the decrease in drag force on the blades toward the upstream region due to stagnation of the flow behind the plates.

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Section: Low-speed Effects Produced By Flat-plate-type Structuresmentioning

confidence: 99%