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Wind turbine wake influence on the mixing of relative humidity quantified through wind tunnel experiments
Journal of Renewable and Sustainable Energy ( IF 2.5 ) Pub Date : 2021-04-15 , DOI: 10.1063/5.0039090
Martín Obligado 1 , Raúl Bayoán Cal 2 , Christophe Brun 1
Affiliation  

An experimental study conducted in a wind tunnel on the mixing of moist air by a scaled wind turbine is presented. The experimental setup allows us to generate stable stratification conditions with respect to relative humidity and temperature in a closed-loop wind tunnel. The flow and its thermodynamic properties were characterized using a Cobra probe (a multi-hole pitot tube) and a sensor of local temperature and relative humidity, both used simultaneously to obtain vertical profiles. The flow and its stratification were measured downstream of a scaled rotor at two different streamwise distances (1 and 10 rotor diameters) and two Reynolds numbers based on the diameter of the wind turbine rotor (22 000 and 44 000, respectively). This was then compared to the inflow conditions. The wake mean structure and the humidity and temperature stratifications of the flow are found to be affected by the presence of the rotor. In particular, the stratification was always smaller one diameter downstream from the model (when compared to the empty test section case), and then was mostly recovered in the far wake (10 diameters downstream). This effect depended not only on the streamwise distance, but also on the Reynolds number of the flow. Finally, the bulk Richardson number Rb was found to be an appropriate parameter to quantify this effect.

中文翻译:

风力机尾流对通过风洞实验量化的相对湿度混合的影响

提出了在风洞中对比例风轮机混合湿空气进行的实验研究。实验设置使我们能够针对闭环风洞中的相对湿度和温度生成稳定的分层条件。使用Cobra探针(多孔皮托管)和局部温度和相对湿度传感器对流动及其热力学性质进行了表征,两者同时用于获得垂直轮廓。在比例缩放的转子的下游以两个不同的沿流方向的距离(转子直径为1和10)和基于风力涡轮机转子的直径(分别为22 000和44 000)的两个雷诺数测量了流量及其分层。然后将其与流入条件进行比较。发现流的尾流平均结构以及湿度和温度分层受转子的存在影响。尤其是,分层总是比模型下游小一个直径(与空的测试截面情况相比),然后在远尾(下游10个直径)恢复了大部分。这种影响不仅取决于流向距离,还取决于流的雷诺数。最后,批量理查森数 而且还取决于流量的雷诺数。最后,批量理查森数 而且还取决于流量的雷诺数。最后,批量理查森数发现R b是量化该作用的合适参数。
更新日期:2021-05-03
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