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Abstract
The main purpose of the present thesis is investigate numerically and experimentally how to improve the performance characteristics of a DAWT system that may be used as an independent power supply to the remote and rural areas in Arab Republic of Egypt. The various diffuser geometric shape parameters that significantly affect the diffuser efficiency are studied numerically aiming to reaching the best diffuser configurations which satisfy the maximum approaching wind speed near the diffuser entrance. The subsequent improvement of the turbine performance characteristics due to applying the best diffuser configurations are calculated and compared with the conventional wind turbine. In additional, experimental tests are performed to validate the numerical models adopted in the current study