Above all vertical axis wind turbines, for their lower cost and independent on wind direction, Savonius rotor takes the advantage to be more suitable for some implementation. Thus, many investigations have been carried out to improve its efficiency. This study emphasizes on the effect of the overlap distance and the blade shape on a helical Savonius wind turbine performance. Assessment methods based on the flow field characterizations, the variation of torque and power coefficient are performed. Thus, transient simulations using the SST k–ω turbulence model are carried out. The numerical model is validated using wind tunnel tests. Results indicate that the non-overlapped helical Savonius rotor highlights higher maximum power coefficient of 0.124 at a tip speed ratio of 0.73 over rotors with overlap distance of 10 mm, 15 mm and 20 mm, respectively. In addition, the delta-bladed rotor improves the performance of the helical Savonius rotor by 14.51%. With the novel blade shape, the maximum power coefficient reaches a value of 0.142 at a tip speed ratio of 0.78. The obtained results present an interesting data that could provide the aerodynamic characteristics of the airflow for the designers and engineers to enhance the efficiency of the helical Savonius turbine.

首先，在所有垂直轴风力涡轮机中，Savonius转子由于成本较低且不受风向影响，因此具有更适合某些实现的优势。因此，已经进行了许多研究以提高其效率。这项研究强调重叠距离和叶片形状对Savonius螺旋风轮机性能的影响。基于流场特征，扭矩和功率系数的变化，执行评估方法。因此，使用SST瞬态仿真ķ - ω进行湍流模型。使用风洞试验验证了数值模型。结果表明，与重叠距离分别为10 mm，15 mm和20 mm的转子相比，不重叠的Savonius螺旋转子在0.73的叶尖速比下具有更高的最大功率系数0.124。此外，三角形叶片转子将Savonius螺旋转子的性能提高了14.51％。对于新颖的叶片形状，最大功率系数在叶尖速比为0.78时达到0.142。获得的结果提供了有趣的数据，可以为设计人员和工程师提供气流的空气动力学特性，以提高Savonius螺旋涡轮机的效率。