عنوان مقاله [English]
In this research, two types of VAWT have been evaluated regarding both the aerodynamic or technical characteristics and also the economic attributes. The baseline turbines selected are a straight blade (H-shaped) turbine and an angled blade (V-shaped) turbine, which both have same dimension and volume. The scale and performance of the turbines are shown to be appropriate for the climatic conditions in Zahedan. The average wind speed distribution of the region has also been investigated. To comparing the power characteristics of these suggested turbines, an aerodynamic method called DMST, double multiple stream tube method, has been presented. Consequently, a MATLAB code has been developed which estimates the forces and moments in both up-wind and down-wind phases. The code is being firstly examined by a validation case, for which experimental data was available. The wind profile has been extracted based on averaging the velocity within 3 recent years. After a validation study on the code results, it was shown the specific trends could be easily drawn by the code. It also can be used for the aerodynamic evaluation of the modified turbines. The results showed that the power produced in the V-type was much less than the H-type, which is due to the reduction of the effective area of the turbine and also the reduction of the torque produced by the rotor. On the other hand, the negative torque during start-up in the V-type is relatively less than H-type machine and this issue will improve the starting phase of the turbine.in spite of lowering the power extracted in V-type system, but the capability of producing wind flow diversion, which can be used in ventilation purpose, is a significant advantage. From the economic point of view, the annual cost of producing regular energy for the V-type turbine is about 10 dollars, which is much lower than the 66-dollar cost of the H-type energy production. It seems using V-type turbines are at least suitable for many dry-weather regions of our country and many other small-scale applications.