Vertical-axis wind turbine experiments at full dynamic similarity
Vertical-axis wind turbine experiments at full dynamic similarity
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DOI：
10.1017/jfm.2018.197
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发表时间：
2017-11
影响因子：
3.7
通讯作者：
M. Miller;S. Duvvuri;I. Brownstein;Marcus Lee;J. Dabiri;M. Hultmark
中科院分区：
文献类型：
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作者：
M. Miller;S. Duvvuri;I. Brownstein;Marcus Lee;J. Dabiri;M. Hultmark
在一个几何比例的垂直轴风力涡轮机模型上进行了实验室实验，该模型的雷诺数范围前所未有，包括并超过了全尺寸涡轮机的雷诺数。该研究是在普林斯顿高雷诺数测试设备（HRTF）的高压环境下进行的。利用高度压缩空气作为工作流体实现极高的雷诺数，同时仍然保持动态相似性，通过匹配叶尖速比（定义为叶尖速度与自由流的比率，$\unicode[STIX]{x1D706}=\unicode[STIX]{x1D714}R/U$）和马赫数（定义在涡轮叶尖，$Ma=\unicode[STIX]{x1D714}R/a$）。与全尺寸现场水轮机的测量结果进行了初步比较。现场数据和实验的峰值功率都在$\unicode[STIX]{x1D706}=1$附近。此外，系统的研究趋势与雷诺数进行了实验室，这揭示了细节的渐近行为。结果表明，表征功率系数不变性的参数是基于叶弦条件的雷诺数（$Re_{c}$）。功率系数在$Re_{c}>1.5\ × 10^{6}$时达到渐近值，高于现场水轮机所经历的功率系数。得到了渐近的功率曲线，该曲线对雷诺数的进一步增大是不变的。
Laboratory experiments were performed on a geometrically scaled vertical-axis wind turbine model over an unprecedented range of Reynolds numbers, including and exceeding those of the full-scale turbine. The study was performed in the high-pressure environment of the Princeton High Reynolds number Test Facility (HRTF). Utilizing highly compressed air as the working fluid enabled extremely high Reynolds numbers while still maintaining dynamic similarity by matching the tip speed ratio (defined as the ratio of tip velocity to free stream, $\unicode[STIX]{x1D706}=\unicode[STIX]{x1D714}R/U$ ) and Mach number (defined at the turbine tip, $Ma=\unicode[STIX]{x1D714}R/a$ ). Preliminary comparisons are made with measurements from the full-scale field turbine. Peak power for both the field data and experiments resides around $\unicode[STIX]{x1D706}=1$ . In addition, a systematic investigation of trends with Reynolds number was performed in the laboratory, which revealed details about the asymptotic behaviour. It was shown that the parameter that characterizes invariance in the power coefficient was the Reynolds number based on blade chord conditions ( $Re_{c}$ ). The power coefficient reaches its asymptotic value when $Re_{c}>1.5\times 10^{6}$ , which is higher than what the field turbine experiences. The asymptotic power curve is found, which is invariant to further increases in Reynolds number.