چكيده به لاتين
Wind energy as one of the most reliable types of energy for reducing greenhouse gases and providing sustainable energy has an ancient history that in recent decades its use has grown significantly in the construction of enormous power plants. This has led to many studies to be conducted on different types of wind turbines, their optimization methods, and the improvement of their performance. The main purpose of this research is to design a different model from conventional vertical axis turbines so that its performance is such that it can compete with other conventional power supply systems for use in urban environments. Therefore, in this study, efforts are concentrated on identifying the geometrical properties of savonius wind turbine and applying appropriate ideas such as using the optimum number of blades, determining the optimal wind turbine dimensions, using or not using the top and bottom plates, finding the optimum overlap ratio, etc. to create a prototype to study on it and apply the idea of using valves to improve the performance of this type of turbine. To this end, the present study is divided into three general sections:
1) Simulation and analysis of the geometric parameters in the ANSYS Workbench software and using CFX solver to find the optimal geometry for prototype construction.
2) Design and construction of the prototype based on the results of the first step and the structural constraints, economic and environmental analysis of the prototype.
3) A secondary simulation by applying the idea of using the valve to improve the performance of the turbine and investigating the effect of the number, method and amount of valve opening on the turbine torque coefficient.
The results obtained from the first part showed that a two-bladed turbine with an overlap ratio of 0.3 and with the presence of end-plates as the optimal turbine. After the construction of the turbine in the second part, the average unit cost of energy for the built turbine in Tehran was equal to 4500 Tomans per kilowatt-hour and from an environmental point of view with the release of 8.6 kg of carbon dioxide is environmentally friendly. In the third part, while examining different configurations of the turbine’s blades, the configuration of the limiting anti-clockwise valve with a 45-degree angle with an increase of 8.02% of the torque coefficient compared to the normal mode showed the best performance.
