الفهرس 
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Abstract
Wind energy has gained popularity recently as a practical renewable energy source that can take the place of polluting fuels like fossil fuels. The Dual Rotor Horizontal Axis Wind Turbine (DRWT) provides faster rates of energy extraction from the wind. The present study aims at assessing the Horizontal axis turbine’s performance before and after adding a second rotor. Also, it investigates the impact of various design parameters such as tip speed ratio, phase shift angle, diameter ratio, rotational speed ratio, axial distance, and airfoil profile on the performance of DRWT. Was used ANSYS Fluent (R19.2). in order to provide streamline representations for front and rear rotors. In order to solve numerically the three-dimensional, turbulent, steady state, incompressible flow equations for the performance of dual rotor wind turbines, k- 𝜔 stress transport (SST) turbulence model is used. A grid independency study was carried out to evaluate the findings and to guarantee their accuracy. The obtained results showed that the DRWT is found to have better performance than Single Rotor Wind Turbine (SRWT) with percentage increase in power coefficient (Cp) by 13.7%. As each tip speed ratio has different phase shift angle, the results prevail that the DRWT with rotational speed of 1 and diameter ratio of 1, has its best performance at TSR of 4 and phase shift angle of rear rotor equals to 5o. Further investigation of the impact of axial distance and diameter ratio with the same airfoil profile doesn’t show a considerable enhancement in DRWT performance. However, changing the profile of the airfoil for rear rotor to Eppler E63 airfoil results in increasing the Cp by 25.9%.