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Start date: 2024Subject: search.filters.subject.Induced drag

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    Analýza aerodynamických riešení konštrukcie UAV
    (University of Žilina, 2025) Dubchenko, Oleksii; Bugaj, Martin
    This bachelor thesis deals with the research and analysis of aerodynamic characteristics of unmanned aerial vehicles (UAVs). For the purpose of analysis, 3D models of aircraft with conventional tailplane and V-shaped tailplane were created. Then, airflow simulation was performed using CFD, where the model with conventional tailplane had an asymmetric wing profile, while the other model had a symmetric wing profile. The aim of the analysis was to compare the aerodynamic characteristics of the models, their lift to drag (L/D) ratio and the character of the airflow around the structure. The experiments showed that the model with a conventional tail achieved a better L/D ratio than the model with a V shaped tail. Although the V-tail configuration usually reduces drag, it did not yield significant improvement in this simulation. These results may have been influenced by the wing airfoils used, as asymmetric airfoils produce more lift at low angles of attack and low airspeeds. Consequently, another experiment was performed in which a conventional tail was applied to the V-tail model. This resulted in a worse L/D ratio compared to the original configuration. The obtained results suggest potential opportunities for optimization of UAV designs to increase their aerodynamic efficiency in the future.
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    Analýza nekonvenčných aerodynamických konfigurácií lietadiel
    (University of Žilina, 2024) Šlachtič, Emil; Veľký, Patrik
    This article deals with the research and analysis of unconventional aerodynamic configurations of aircraft, developed in the aerospace industry. Primary CFD simulations of the respective models were used for the purpose of research and analysing the configurations, as well as analysis of the airflow around the 3D models in the wind tunnel of Air Transport Department. The aim was to find out why these configurations are not being used, or why they should be used in the aviation industry nowadays. The analysis was carried out mainly from an aerodynamic point of view. The different models were chosen based mainly on IATA’s forecast of trends in air transport. From the analyses, it was found that certain models are more efficient than their conventional counterparts, mainly due to the reduction in induced drag. However, these configurations are also much more sensitive to flutter due to the high aspect ratio, which poses a challenge especially from a structural point of view. Ti can therefore be assumed that the reason for not using these configurations represent a significant reduction in operating costs, they are unprofitable for operators. In contrast, BWB configurations appear very promising in terms of both efficiency and fuel savings, and it is therefore assumed that these models may enter service in 2030.