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Fourth-generation biofuels for jet engines
Marko, Adam ; Mišík, Ondrej (referee) ; Malý, Milan (advisor)
The bachelor thesis deals with the decarbonisation of air transport and the possible use of biofuels to power jet engines. As the use of the current fuel, kerosene, is time limited due to finite oil supplies, research and testing of its environmentally friendly successors is necessary. Equally important is the parallel development of compatible aviation and airport infrastructure, both in the form of airframes, engines and fuel systems and ground support equipment. In the event of a transition to a new type of aviation fuel, it is essential that it is technically advanced, affordable, environmentally sound, safe and has a wide supply chain. Currently, the scientific community is most focused on the use of sustainable aviation fuels SAF, hydrogen, ammonia, LNG and e-fuels. To qualify as a biofuel, the production process must be carbon neutral and the primary source of production must be renewable energy.
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Efficiency incerasing of axial compressors of jet engines
Fojtl, Michal ; Weis, Martin (referee) ; Šplíchal, Miroslav (advisor)
Bachelor thesis deals with axial compressors of jet engines and with increasing their efficiency. First part describes basic principles of compressors, losses, stall and surge and compressor characteristics. Second part deals with possible solutions for increase of their efficiency and pressure rise. These solutions are summarized and possible combination is recommended.
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Modeling and control of aircraft jet engines
Voda, Tomáš ; Blaha, Petr (referee) ; Veselý, Libor (advisor)
This thesis deals with the description of aircraft engines, their control requirements and control possibilities of these engines. In the practical part, the Jetcat P80-SE engine model was created. This model was then verified against a real engine with measured actual engine speed and temperature. These parameters were then compared with simulated engine speed and temperature. Due to this comparison we can say that it was possible to create a model of the engine that corresponds to the real engine. In addition, the speed controller was designed to meet the control requirements over the speed range. A PI speed controller was designed in different variants, the variants were then compared. Due to the safety limits of the manufacturer were not known, limit values were only implemented to show how the limitation could be implemented.
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Modeling and control of aircraft jet engines
Voda, Tomáš ; Blaha, Petr (referee) ; Veselý, Libor (advisor)
This thesis deals with the description of aircraft engines, their control requirements and control possibilities of these engines. In the practical part, the Jetcat P80-SE engine model was created. This model was then verified against a real engine with measured actual engine speed and temperature. These parameters were then compared with simulated engine speed and temperature. Due to this comparison we can say that it was possible to create a model of the engine that corresponds to the real engine. In addition, the speed controller was designed to meet the control requirements over the speed range. A PI speed controller was designed in different variants, the variants were then compared. Due to the safety limits of the manufacturer were not known, limit values were only implemented to show how the limitation could be implemented.
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Efficiency incerasing of axial compressors of jet engines
Fojtl, Michal ; Weis, Martin (referee) ; Šplíchal, Miroslav (advisor)
Bachelor thesis deals with axial compressors of jet engines and with increasing their efficiency. First part describes basic principles of compressors, losses, stall and surge and compressor characteristics. Second part deals with possible solutions for increase of their efficiency and pressure rise. These solutions are summarized and possible combination is recommended.
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Application opportunity of IT's contactless vibrodiagnostic system for measurement of dynamic behaviour of rotor bladed wheels.
Vaněk, František ; Pešek, Luděk ; Procházka, Pavel ; Cibulka, Jan ; Turinský, M. ; Laštovka, B.
Variable excitation forces evoke a rotor blade vibration at jet engines. For description of the blade vibrations, parameters such as modes, frequencies and amplitudes, are evaluated in different operational regimes of engines. Since the operational forces are not fully known and mechanical parameters of the blades changes during sirvece the vibrodiagnostic measuring system VDS.IT was developed in IT AS CR. This system can be used for long-term measurement of vibration of all free-ended blades of rotors. Since the latest development of shrouded blades this system has been modified and fully tested in the Experimental laboratory of Škoda Power, Plzeň. The changes and results are discussed in this contribution.
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