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CFD software calibration
Gego, Tomáš ; Zima, Martin (oponent) ; Popela, Robert (vedoucí práce)
The objective of this thesis was to calibrate a CFD software for use on a Formula Student race car. The calibration is performed by comparing the experimental data from the measurement of a single element wing in a wind tunnel with the same case replicated in a CFD software, for which the optimization of settings of the meshing and solver is performed. The result is an evaluation of deviations of CFD by assessing aerodynamic characteristics such as downforce, drag, pressure distribution, separation and wake in freestream and ground effect. The results are processed into a graphical and text form for future use in the design of aerodynamic components.
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Urban Air Mobility VTOL personal vehicle design
Polčák, Marek ; Zikmund, Pavel (oponent) ; Popela, Robert (vedoucí práce)
The thesis deals with a conceptual design of a rotorcraft in the configuration of a multicopter, which has the design features of a motorcycle. Initial input parameters and requirements for conceptual design were based on statistical research of similar existing concepts. Afterwards, suitable components of propulsion system were chosen to fit the proposed design and flight performance requirements. UAM vehicle was designed as a coaxial quadcopter. Multicopter was designed as a composite construction combining aluminium space frame and composite ducts, which cover the propellers. Centre of gravity was calculated to ensure that its position lies exactly between front and rear rotors, which has a significant impact on stability. Structural strength of important components was then checked using FEM. Besides the structural analysis of a space frame, great deal of emphasis has been placed on structural analysis of composite ducts. This analysis helped to define inner structure and ensure that it withstands given load. Since the multicopter may benefit from ground effect benefits, its impact was evaluated by CFD analysis in three different distances from the ground. Positive influence of ground effect was evaluated based on extended battery endurance at hover for different payloads. Forward flight performance of designed UAM VTOL vehicle was carried out together with the estimation of drag coefficient of the multicopter with a pilot using CFD for different pitch angles. Obtained drag coefficient were then used for the calculation of multicopter forward flight speed dependency on pitch angle and battery endurance. In the end, two proposals of flight controller were presented together with possible control system and sensors, which could be used.
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Přísavný efekt v motorsportu
Mlčoch, Pavel ; Hejtmánek, Petr (oponent) ; Čavoj, Ondřej (vedoucí práce)
Bakalářská práce se zaměřuje na popis přísavného efektu, jeho vlivu na aerodynamiku vozidla a využití v motorsportu. Práce se zabývá závislostí tohoto způsobu vytváření přítlaku na konstrukci vozu a jeho nastavení, ale také na relativním pohybu prvků generujících přítlak vzhledem k povrchu při nasazení v závodech. Dále jsou uvedeny výhody a nevýhody využívání přísavného efektu. Také je vypracován stručný přehled historie použití přísavného efektu. Na konci práce je pozornost věnována moderním závodním i osobním automobilům využívajícím tohoto fenoménu.
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Chladicí systém Formule Student
Marek, Jiří ; Šebela, Kamil (oponent) ; Janoušek, Michal (vedoucí práce)
Tato bakalářská práce se zabývá chladícím systémem Formule Student, analýzou současného systému chlazení, jeho konstrukčního řešení a návrhem na jeho zlepšení. Na základě rešerše chladících systému Formule Student a přízemního efektu byl implementován vodní výměník do zadního dvojitého difuzoru za účelem podpoření aerodynamiky a zlepšení důležitých parametrů pro dynamiku vozidla. Část výpočetní kapacity byla poskytnuta projektem „e-Infrastruktura CZ“ (e-INFRA LM2018140) poskytnuta na základě projektu výzkumu, vývoje a inovací.
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Urban Air Mobility VTOL personal vehicle design
Polčák, Marek ; Zikmund, Pavel (oponent) ; Popela, Robert (vedoucí práce)
The thesis deals with a conceptual design of a rotorcraft in the configuration of a multicopter, which has the design features of a motorcycle. Initial input parameters and requirements for conceptual design were based on statistical research of similar existing concepts. Afterwards, suitable components of propulsion system were chosen to fit the proposed design and flight performance requirements. UAM vehicle was designed as a coaxial quadcopter. Multicopter was designed as a composite construction combining aluminium space frame and composite ducts, which cover the propellers. Centre of gravity was calculated to ensure that its position lies exactly between front and rear rotors, which has a significant impact on stability. Structural strength of important components was then checked using FEM. Besides the structural analysis of a space frame, great deal of emphasis has been placed on structural analysis of composite ducts. This analysis helped to define inner structure and ensure that it withstands given load. Since the multicopter may benefit from ground effect benefits, its impact was evaluated by CFD analysis in three different distances from the ground. Positive influence of ground effect was evaluated based on extended battery endurance at hover for different payloads. Forward flight performance of designed UAM VTOL vehicle was carried out together with the estimation of drag coefficient of the multicopter with a pilot using CFD for different pitch angles. Obtained drag coefficient were then used for the calculation of multicopter forward flight speed dependency on pitch angle and battery endurance. In the end, two proposals of flight controller were presented together with possible control system and sensors, which could be used.
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CFD software calibration
Gego, Tomáš ; Zima, Martin (oponent) ; Popela, Robert (vedoucí práce)
The objective of this thesis was to calibrate a CFD software for use on a Formula Student race car. The calibration is performed by comparing the experimental data from the measurement of a single element wing in a wind tunnel with the same case replicated in a CFD software, for which the optimization of settings of the meshing and solver is performed. The result is an evaluation of deviations of CFD by assessing aerodynamic characteristics such as downforce, drag, pressure distribution, separation and wake in freestream and ground effect. The results are processed into a graphical and text form for future use in the design of aerodynamic components.
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Chladicí systém Formule Student
Marek, Jiří ; Šebela, Kamil (oponent) ; Janoušek, Michal (vedoucí práce)
Tato bakalářská práce se zabývá chladícím systémem Formule Student, analýzou současného systému chlazení, jeho konstrukčního řešení a návrhem na jeho zlepšení. Na základě rešerše chladících systému Formule Student a přízemního efektu byl implementován vodní výměník do zadního dvojitého difuzoru za účelem podpoření aerodynamiky a zlepšení důležitých parametrů pro dynamiku vozidla. Část výpočetní kapacity byla poskytnuta projektem „e-Infrastruktura CZ“ (e-INFRA LM2018140) poskytnuta na základě projektu výzkumu, vývoje a inovací.
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