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Ανάπτυξη μεθοδολογίας για ανάλυση αντοχής σε ανεμογεννήτρια εφοδιασμένη με διαχύτη (DAWT)

Georgiou Michail

Πλήρης Εγγραφή

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Περίληψη

In the present work, we have studied the structural stability of the inner column of a Diffuser Augmented Wind Turbine (DAWT). The study model is an existing, under-development wind turbine. Diffuser Augmented Wind Turbines function extremely well in terms of performance. The volume of the diffuser causes the ambient air to redirect and accelerate as it passes through the tunnel in the center of the diffuser. This additional flow and acceleration provide a higher energy output. Increasing to larger diameters this advantage reversing and turning it into a greater stumbling block. The wind resistance that augments the energy output is carried through the structure to the ground. This also increases the forces that the structure must withstand to tremendous levels. Unfortunately, this stumbling block limits the size of DAWTs; therefore they cannot directly compete with Horizontal Axis Wind Turbines (HAWT), whose development has taken them to unfathomable heights. This does not mean that there is no reason for further research and development of DAWTs, which, as we have already mentioned, have significantly higher performance at similar blade diameters compared to HAWTs. DAWTs may be an alternative in many specific locations and may be a solution that is worth investigating in the fight against climate change. As our study shows, the DAWT’s structure is subjected to very strong frontal forces, due to the drag of the diffuser. For this reason, we intend to investigate the strength of the metal column holding the diffuser, using finite element analysis (FEA). We have attempted to strengthen the critical points while keeping the overall size narrow. We are trying to find a technically and economically feasible solution to the problem and have tried to optimize the project to some extent. The whole process is illustrated in the following diagram. This cycle was performed a number of times, while in this study we present only the final iteration and the corresponding results.

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