Experimental study of the effect of slotted blades on the Savonius wind turbine performance

The Savonius -conventional wind turbine is a class of wind turbines designed with a vertical axis. It has a good starting capacity and   an insensitivity to wind direction. It works relatively at low wind speed in an easy installation. Savonius wind turbine faces major drawbacks, including some of the low efficiency and high negative torque created by the returning blade. Many attempts have been undertaken to optimize the blade’s shape to increase the performance of these wind turbines. The vertical axis is still under development. The elliptical-blades with a cut angle equal 47.50° have recently shown enhanced performance. In this study, we investigate the effect of Elliptical-bladed multistage Savonius Rotors (rotor aspect ratio, stage aspect ratio) on the performance by means of numerical simulation. The results obtained by comparison of one, two, and three-stage rotors indicate that the maximum power coefficient increase with a number of the stages (for the rotors with similar RAR of 0.7). Moreover, for the rotors with similar SAR of 0.7, the two stages have the highest performance than others.

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CFD Investigation of A New Elliptical-Bladed Multistage Savonius Rotors

Currently, the Savonius wind turbine (SWT) has established itself as a reliable wind turbine solution, particularly for small-scale wind farms. It is a reliable form of power generation owing to its self-starting capability, lack of reliance on wind direction, and low vibration and noise. As a result, it has been gaining popularity worldwide. The main technological challenge in this field, however, is the inferior efficiency of Savonius turbines compared to their other counterparts. A large number of studies have been conducted to enhance the power coefficient of SWT. These studies primarily focused on blade profile and augmentation strategies using simulation-based optimization approaches. Some recent studies, in contrast, have attempted to integrate Artificial Intelligence (AI) into the SWT optimization method. However, to ensure the maximum efficiency and commercial feasibility of SWTs, additional strategy is required. Based on previous and current research trends, this review presents a next-generation SWT blade design framework. The importance of AI in output optimization at low computing costs has been emphasized. Finally, future design concerns have raised the possibility of using a smart blade and digital twin model to enhance the efficiency of SWT blades. Moreover, the existing roadblocks and their possible solutions are also highlighted. • The evolution of the Savonius blade profile on the power coefficient is explored. • Influence of artificial intelligence on blade optimization is recognized. • Frameworks, policies, and regulations for next-generation SWT are detailed. • Integration of smart-blade and digital-twin with SWT is explored. • Challenges, solutions, and opportunities for next-generation SWT are characterized. 

Towards next generation Savonius wind turbine: Artificial intelligence in blade design trends and framework

Effect of Slotted Angle on Savonius Wind Turbine Performance

The increasing needs for energy and the depletion sources of fossil fuels required the use of renewable and clean energy sources. Wind energy is a renewable energy that demand is high right now because it is easily obtained, abundant and environmentally friendly. Wind turbines use the available kinetic energy of the wind to be converted into mechanical and electrical energy. Savonius is vertical types of wind turbines that have advantages such as construction, low investment costs, and high-speed initial torque. However, Savonius turbines have a disadvantage of low efficiency. This research aims to improve the performance of the Savonius wind turbine by using a slotted blade. In this research, conventional Savonius rotor experiments were carried out and approved by the slotted blade by varying the slot position. Blower fans are used as a source of wind with variations in wind speed from 5.94 m / s to 7.27 m / s. The results showed that the use of a slotted blade could increase coefficient power of the Savonius turbine 0.95 with a variation of the slotted blade at 25% position and an increase of 14.4% compared to conventional Savonius turbines.

Agung Dwi Nugroho

Papers

Slotted blade effect on Savonius wind rotor performance