International Journal of Mechanical & Mechatronics Engineering IJMME-IJENS Vol:19 No:04 85 192104-3535-IJMME-IJENS © August 2019 IJENS I J E N S Experimental Study of the Performance of the Elliptical Savonius Turbine and New Design for Blade Shape Using A 3D Printing Technology Salih Meri Al Absi 1, 2,* , Salleh H.B 1 , Muayad M. Maseer 1 , Mohammed A. Abbas 1 , Balasem A. Al-quraishi 1 , Sabah S. Hamza 1 1 Faculty of Mechanical and Manufacturing Engineering, University Tun Hussein Onn Malaysia (UTHM), 2 Iraqi Cement State Company, Ministry of Industry and Minerals, Baghdad, Iraq * Corresponding author: salih.meri.ar@gmail.com Abstract-- The main parameter influencing the increase in the performance efficiency of the Savonius wind turbine is the geometry of the blade shape. Therefore, a lot of research has been done on developing and improving this parameter. In this study, a series of numerical tests were performed on the Savonius wind turbine by means of a 2D unsteady simulation (CFD Fluent) to the validation of the experimental results of the elliptical Savonius turbine and also to test different types of turbulence models which are Standard k-ω, (SST) k-ω, Standard k-ϵ and Realizable k-ϵ. After that, the new model is developed by changing the internal surface of the concave blade to increase its surface area (wavy shape) and it is experimental tested in the open wind tunnel with wind velocity (6 m/s, 9 m/s) and record the maximum power coefficient was (0.296) with the tip speed ratio (0.72). The new blade design showed a better performance than the classical elliptical Savonius turbine model. Index Term— Savonius rotor; CFD-Fluent; New design for blade shape; Coefficient of power. I. INTRODUCTION The interest of many developed countries in recent years to reduce the use of conventional fuel by focusing on the development and utilization of the natural resources of clean energy [1]. One of the most important applications of green technology is the exploitation of wind energy in the production of electric power and mechanics because it is low cost and abundant resource [2]. The Savonius wind turbine was designed and manufactured by the engineer Savonius in 1925 by exploiting and using the energies available (wind power) to produce mechanical energy which features a simple design and limited parts with limited efficiency [3]. The advantages of vertical turbines are low noise, easy maintenance and operation because of its proximity to the surface of the earth, as well as the reception of air currents from all directions without the need for steering devices [4], [5], [6]. The contributions of the researchers on the development of the efficiency of a Savonius wind turbine have thought at the effect of geometric parameters on increasing the power coefficient   and torque coefficient   [7]. The most important of these geometrical parameters is the overlap ratio which has the distinctive role on the rotor performance, the best proportion of the overlap ratio was (0) [8]. Others demonstrated that the end plate at the upper and lower end of the rotary is increased by the power coefficient so as to concentrate the air on the advanced blades and avoid wind loss on both sides [9], [10]. For the purpose to increase the power of the turbine-oriented wind on the wind system by putting the Savonius rotor at the centre of the guides vane which the Installed around the rotor and at certain angles, to focuses the air current on the concave blade and also reduce the negative torque on the convex blade [11]. Increase the efficiency of the turbine and raise the values of the power factor and the torque factor through the technique of air deflection towards the Savonius rotor [12], [13]. The number of rotor blades was the best for two to increase the amount of air directed on the advanced blade [14], [15]. The turbine is two-stage more stable and efficient than the one stage [16]. To devote the efforts of researchers and interested in developing and improving the efficiency of the blades and is the most important part of the Savonius wind turbines. The objective this study is developing the shape of the blade to increase the positive torque of the concave side of a rotor and to work on reducing the negative torque on the convex side of the rotor by new techniques and different ways. The study will be divided according to the rotor model design depended on geometry parameters of the blade shape to 2D unsteady simulation and experimental test as shown in Figure 1. Fig. 1. Flowchart of study