The noise emission from a vertical axis wind turbine (VAWT) has been investigated. A noise measurement campaign on a 200 kW straight-bladed VAWT has been conducted, and the result has been compared to a semi-empirical model for turbulent-boundary-layer trailing edge (TBL-TE) noise. The noise emission from the wind turbine was measured, at wind speed 8 m/s, 10 m above ground, to 96.2 dBA. At this wind speed, the turbine was stalling as it was run at a tip speed lower than optimal due to constructional constraints. The noise emission at a wind speed of 6 m/s, 10 m above ground was measured while operating at optimum tip speed and was found to be 94.1 dBA. A comparison with similar size horizontal axis wind turbines (HAWTs) indicates a noise emission at the absolute bottom of the range. Furthermore, it is clear from the analysis that the turbulent-boundary-layer trailing-edge noise, as modeled here, is much lower than the measured levels, which suggests that other mechanisms are likely to be important, such as inflow turbulence.
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机译：已经研究了垂直轴风力涡轮机（VAWT）的噪声排放。已经对200 kW直叶片VAWT进行了噪声测量，并将该结果与湍流边界层后缘（TBL-TE）噪声的半经验模型进行了比较。在风速8 m / s，离地面10 m的情况下，测量了来自风力涡轮机的噪声，达到96.2 dBA。在此风速下，由于结构限制，涡轮以低于最佳速度的叶尖速度运转时失速。在以最佳叶尖速度运行时，测量了在离地面10 m处风速6 m / s时的噪声发射，发现为94.1 dBA。与类似尺寸的水平轴风力涡轮机（HAWT）的比较表明，噪声排放在该范围的绝对底部。此外，从分析中可以明显看出，此处建模的湍流边界层后缘噪声远低于实测水平，这表明其他机制可能也很重要，例如流入湍流。
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