In the present work, the influence of a compact diffuser on aerodynamic behavior of small-scale wind turbine is analyzed using both CFD and experimental approaches. The present work aims to obtain a compact diffuser shroud while ensuring high aerodynamic performance in order to reduce the fabricating costs, materials, and structural loads on the mast. In this regard, a unique optimization approach is employed to optimize the geometrical features of the shroud profile including length of both entrance and diffuser sections, radii of both diffuser and entrance area. The shroud profile is mathematically described using second-order polynomial functions. The optimization findings affirmed that the total length of optimized shroud profile is shorter by approximately 6 % than the baseline (C_ii) configuration. However, the wind speed obtained from the optimized shroud profile shows an improvement of 1.58% compared to the baseline configuration at the throat area. A high-fidelity CFD simulation of the wind turbine equipped with an optimized shroud profile using commercial software SATR-CCM+ was performed to evaluate the overall aerodynamic performance of the wind lens system. Both conventional and shrouded wind turbines were investigated for two different cases: constant rotor speed, and constant wind speed. Furthermore, an experimental test was implemented for both conventional and shrouded turbines under various environmental conditions using an open-loop wind tunnel. A systematic comparison between CFD results with the corresponding experimental data for both turbines is performed. It is evident that placing an optimized shroud around the rotor improves the aerodynamic performance more than twofold compared to the bare turbine. Moreover, results revealed that C_p obtained from shrouded Wind Turbine increased by approximately 66.4 % compared to the conventional one based on CFD results, whereas, it has increased by 69.3 % according to the experimental data.

在目前的工作中，使用 CFD 和实验方法分析了紧凑型扩散器对小型风力涡轮机空气动力学行为的影响。目前的工作旨在获得紧凑的扩散器护罩，同时确保高空气动力学性能，以降低桅杆上的制造成本、材料和结构载荷。在这方面，采用独特的优化方法来优化护罩轮廓的几何特征，包括入口和扩散器部分的长度、扩散器和入口区域的半径。护罩轮廓使用二阶多项式函数进行数学描述。优化结果证实优化后的护罩轮廓的总长度比基线短约 6 % ( C _ii） 配置。然而，与喉部区域的基线配置相比，从优化的护罩轮廓获得的风速显示提高了 1.58%。使用商业软件 SATR-CCM+ 对配备优化护罩轮廓的风力涡轮机进行高保真 CFD 模拟，以评估风透镜系统的整体空气动力学性能。针对两种不同情况对传统风力涡轮机和带罩式风力涡轮机进行了研究：恒定转子速度和恒定风速。此外，使用开环风洞在各种环境条件下对传统和带罩涡轮机进行了实验测试。对两个涡轮机的 CFD 结果与相应的实验数据进行了系统比较。很明显，与裸涡轮相比，在转子周围放置优化的护罩可将空气动力学性能提高两倍以上。此外，结果显示，与基于 CFD 结果的传统风力涡轮机相比，从罩式风力涡轮机获得的C _p增加了约 66.4%，而根据实验数据，它增加了 69.3%。