湍流估计对机舱激光雷达扫描策略的依赖性

IF 3.6 Q3 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY Wind Energy Science Pub Date : 2023-05-04 DOI:10.5194/wes-8-677-2023
Wei Fu, A. Sebastiani, A. Peña, J. Mann
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引用次数: 1

摘要

摘要通过数值模拟和现场测量分析,我们研究了湍流估计的准确性和不确定性对机舱激光雷达扫描策略的主要特征的依赖性,即测量点的数量、半锥开口角、焦点距离和激光雷达系统的类型。我们假设Vestas V52风力涡轮机前方的激光雷达扫描区域存在均匀湍流。雷诺应力是通过最小二乘法计算的,该方法使用每个激光雷达光束的径向速度变化来重建风分量。激光雷达获取的雷诺应力与涡轮机轮毂高度的声波风速计的雷诺应力作了比较。我们对模拟和测量结果的分析表明,要准确估计六个雷诺应力,需要一个至少有六个光束的激光雷达系统。此外,该系统的一个梁应当具有不同的打开角度。增加一个中心波束可以改进速度分量方差的估计。假设IEC标准中假设了速度分量方差的关系,所有考虑的激光雷达都可以使用最小二乘法和多普勒径向速度谱准确估计顺风方差。增加开口角可以提高精度,降低横向分量的不确定性,而增加测量距离则会产生相反的影响。总之,六光束连续波激光雷达在大开角的近距离测量提供了对所有雷诺应力的最佳估计。这项工作为机舱激光雷达的设计和利用提供了见解。
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Dependence of turbulence estimations on nacelle lidar scanning strategies
Abstract. Through numerical simulations and the analysis of field measurements, we investigate the dependence of the accuracy and uncertainty of turbulence estimations on the main features of the nacelle lidars' scanning strategy, i.e., the number of measurement points, the half-cone opening angle, the focus distance and the type of the lidar system. We assume homogeneous turbulence over the lidar scanning area in front of a Vestas V52 wind turbine. The Reynolds stresses are computed via a least-squares procedure that uses the radial velocity variances of each lidar beam without the need to reconstruct the wind components. The lidar-retrieved Reynolds stresses are compared with those from a sonic anemometer at turbine hub height. Our findings from the analysis of both simulations and measurements demonstrate that to estimate the six Reynolds stresses accurately, a nacelle lidar system with at least six beams is required. Further, one of the beams of this system should have a different opening angle. Adding one central beam improves the estimations of the velocity components' variances. Assuming the relations of the velocity components' variances as suggested in the IEC standard, all considered lidars can estimate the along-wind variance accurately using the least-squares procedure and the Doppler radial velocity spectra. Increasing the opening angle increases the accuracy and reduces the uncertainty on the transverse components, while enlarging the measurement distance has opposite effects. All in all, a six-beam continuous-wave lidar measuring at a close distance with a large opening angle provides the best estimations of all Reynolds stresses. This work gives insights on designing and utilizing nacelle lidars for inflow turbulence characterization.
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来源期刊
Wind Energy Science
Wind Energy Science GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY-
CiteScore
6.90
自引率
27.50%
发文量
115
审稿时长
28 weeks
期刊最新文献
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