Abstract Wind turbines are the means of converting wind energy into electrical energy. It is not unexpected that certain brands of horizontal wind turbines are optimally designed for certain wind speed regimes prevailing at certain sites. It has been the objective of this study to find out whether it is possible to design a wind turbine that is more suitable for a site of lower annual mean wind speed such as the western coast of Libya. In achieving this objective, use was made of a typical wind turbine aerodynamic design and performance analysis procedure together with actual wind speed data recorded at the city of Misurata.Based on the annual wind energy yield obtained from different designs of wind turbines having different rated wind speeds and different blade design tip speed ratios, this study indicates that the decrease of the rated wind speed leads to a continuous increase of annual energy yield as well as an increase of the cost of the wind turbine. Therefore the optimum value of rated wind speed for this site may only be determined as a compromise between added wind energy yield and added cost. Moreover, for any given rated wind speed this study indicates that a blade design tip speed ratio equal to six seems to be the optimum value for the given site.
محمد على نايلي (2015)

تهدف الدراسة في هذا المشروع إلي تطوير نموذج تحليلي أحادي البعد يدرس دورة واحدة لمحرك التفجير النابض (PDE). النموذج مبني أساسا على قيم الضغط عند جدار أنبوب التفجير. وقد تمت المقارنة مع بعض النتائج النظرية الموجودة في أحد المراجع لغرض تقييم والتحقق من نتائج النموذج الحالي.معاملات الأداء والتي تشمل، نسبة صرف الوقود، وحدود التردد، ونسبة الوزن إلي قوة الدفع، تم حسابها في نطاق ضروف التشغيل المقترحة. أما الجوانب الإنشائية والتي تتضمن، إجهاد الخضوع، ووزن المحرك، وسرعة تردد الموجة، تم حسابها لغرض تحديد الإطار العام للتصميم المبدائي للمحرك. تم أستخدام الإكسل (Excel sheet) في برمجة النموذج الرياضي في هذا المشروع حيت تم تصميم حاسبة أستخدمت في إيجاد المعاملات التصميمية.لغرض الأعمال المستقبلية فقد تم وضع الإطار المبدائي للمحرك من ناحية الأداء والعوامل الأنشائية. Abstract The objective of the present work is to develop a general one-dimensional analytical model for the impulse of a single cycle pulse detonation engine (PDE). The model is based on the history of pressure at the thrust surface of the detonation tube. The model is validated against theoretical results that obtained in the literature.Performance parameters include, thrust specific fuel consumption, frequency limits, and thrust to weight ratio have been estimated over a range of operating conditions. The structural aspects, such as yield stress, engine weight, and flexural wave are also considered and obtained in this work.The calculation routines are ideally suited to excel programs sheet calculator, and hence the designed model has been laid out according to this calculator outputs.For further work, preliminary design study is identified for both performance and structural aspects.
عبدالحكيم ميلاد القموني (2010)

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saleh R. Abdussalam Gashoot, Gamal M. Ashawesh , M. Kaheal(2-2005)