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Characterization of aerodynamic performance of wind-lens turbine using high-fidelity CFD simulations
Frontiers in Energy ( IF 2.9 ) Pub Date : 2020-12-20 , DOI: 10.1007/s11708-020-0713-0
Islam Hashem , Aida A. Hafiz , Mohamed H. Mohamed

Wind-lens turbines (WLTs) exhibit the prospect of a higher output power and more suitability for urban areas in comparison to bare wind turbines. The wind-lens typically comprises a diffuser shroud coupled with a flange appended to the exit periphery of the shroud. Wind-lenses can boost the velocity of the incoming wind through the turbine rotor owing to the creation of a low-pressure zone downstream the flanged diffuser. In this paper, the aerodynamic performance of the wind-lens is computationally assessed using high-fidelity transient CFD simulations for shrouds with different profiles, aiming to assess the effect of change of some design parameters such as length, area ratio and flange height of the diffuser shroud on the power augmentation. The power coefficient (Cp)is calculated by solving the URANS equations with the aid of the SST kω model. Furthermore, comparisons with experimental data for validation are accomplished to prove that the proposed methodology could be able to precisely predict the aerodynamic behavior of the wind-lens turbine. The results affirm that wind-lens with cycloidal profile yield an augmentation of about 58% increase in power coefficient compared to bare wind turbine of the same rotor swept-area. It is also emphasized that diffusers (cycloid type) of small length could achieve a twice increase in power coefficient while maintaining large flange heights.



中文翻译:

使用高保真CFD模拟表征风镜涡轮的空气动力性能

与裸露的风力涡轮机相比,风力透镜涡轮机(WLT)展现出更高的输出功率和更适合城市地区的前景。风镜通常包括扩散器罩,该扩散器罩与附接至罩的出口外围的凸缘连接。由于在法兰式扩散器下游形成了低压区,因此风镜可以提高通过涡轮机转子进入的风的速度。在本文中,使用高保真瞬态CFD仿真对风罩的空气动力学性能进行了评估,以模拟具有不同轮廓的护罩,旨在评估某些设计参数(如长度,面积比和法兰高度)变化的影响。扩压器罩上的功率增加。功率系数(C ^ p)通过与SST的帮助求解URANS公式计算ķ - ω模型。此外,与用于验证的实验数据进行了比较,以证明所提出的方法能够精确地预测风镜涡轮的空气动力学行为。结果证实,与相同转子掠过区域的裸风力涡轮机相比,具有摆线轮廓的风镜可将功率系数提高约58%。还应强调的是,小长度的扩散器(摆线型)可以在保持较大法兰高度的同时,使功率系数增加两倍。

更新日期:2020-12-23
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