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Characterizing tilt effects on wind plants
Journal of Renewable and Sustainable Energy ( IF 2.5 ) Pub Date : 2020-08-13 , DOI: 10.1063/5.0009853
Ryan Scott 1 , Juliaan Bossuyt 1 , Raúl Bayoán Cal 1
Affiliation  

Tilting the nacelle of a wind turbine modifies entrainment into the wind plant and impacts total efficiency. Wakes are deflected vertically by tilt and in the case of large angles can disrupt entertainment from the undisturbed flow or dissipate on the ground. The effect of nacelle tilt on wake behavior is investigated in a series of wind tunnel experiments for the first time. Scale model turbines with a hub height and a diameter of 12 cm are arranged in a Cartesian array composed of four rows of three turbines each. The tilt angle was varied in the third turbine row from −15° to 15° in chosen 5° increments. Stereo particle image velocimetry measurements of the instantaneous velocity field were recorded at four locations for each angle. Tilted wakes are described in terms of the average streamwise velocity, vertical velocity, and Reynolds stresses. Mean kinetic energy quantities are presented, and conditional sampling is employed to quantify the importance of sweep to ejection events in vertical momentum transfer. Additionally, the effect of nacelle tilt on net power production is presented and compared to existing models. Numerical simulations accurately predict losses in net efficiency for positive angles but diverge for negative tilt angles. The results demonstrate that the tilt angle influences wake magnitude, displacement, and recovery. Positive angles deflect wakes above the wind plant, while negative angles encourage entrainment into the wind plant and exhibit rapid recovery.

中文翻译:

表征倾斜对风电厂的影响

倾斜风力涡轮机的机舱会改变夹带到风力发电厂中,并影响总效率。尾音会因倾斜而垂直偏转,在大角度的情况下,会扰乱不受干扰的水流带来的娱乐或消散在地面上。首次在一系列风洞实验中研究了机舱倾斜对尾流行为的影响。轮毂高度和直径为12 cm的比例模型涡轮机以笛卡尔阵列排列,该笛卡尔阵列由四行组成,每行三个涡轮机。在第三排涡轮中,倾斜角以选定的5°增量从-15°到15°变化。在每个角度的四个位置处记录了瞬时速度场的立体粒子图像测速仪测量结果。倾斜的尾流以平均水流速度,垂直速度和雷诺应力来描述。给出了平均动能量,并采用条件采样来量化扫掠对垂直动量传递中喷射事件的重要性。此外,还介绍了机舱倾斜对净发电量的影响,并将其与现有模型进行了比较。数值模拟可以准确地预测正角度净效率的损失,但对于负倾斜角度则发散。结果表明,倾斜角会影响尾波幅度,位移和恢复。正角将尾流偏转到风电厂上方,而负角则鼓励夹带进入风电厂并显示出快速恢复的趋势。介绍了机舱倾斜对净发电量的影响,并将其与现有模型进行了比较。数值模拟可以准确地预测正角度净效率的损失,但对于负倾斜角度则发散。结果表明,倾斜角会影响尾波幅度,位移和恢复。正角将尾流偏转到风电厂上方,而负角则促使夹带进入风电厂并显示出快速恢复的趋势。介绍了机舱倾斜对净发电量的影响,并将其与现有模型进行了比较。数值模拟可以准确地预测正角度净效率的损失,但对于负倾斜角度则发散。结果表明,倾斜角会影响尾波幅度,位移和恢复。正角将尾流偏转到风电厂上方,而负角则促使夹带进入风电厂并显示出快速恢复的趋势。
更新日期:2020-08-31
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