Práce a štúdie

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Author: search.filters.author.Čerňan, JozefEnd date: 2023

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    Ignition system and their purpose in aircraft reciprocating engines
    (University of Žilina, 2023) Vorlíček, Marek; Čerňan, Jozef
    This research describes the function and principles of ignition systems in aircraft reciprocating engines. Physical-chemical processes, which are part of combustion, and the factors affecting them are defined in detail. Types of ignition systems are divided based on main parts and frequency of appearance in aircraft engines. Components of ignition and their function in electric and magnetic circuits are individually described. The future development in ignition systems is defined. The research includes an analysis of the pros and cons of laser ignition in its application in aviation. It presents Low-Temperature Combustion or Volumetric Ignition using Low-Temperature Plasma. An example may be the Microwave-assisted Plasma Ignition System. Engine speed and vacuum in intake are the main parameters influencing the ignition timing curve in Electronic Control Unit Master developed by IMF Soft. This ECU is used in the designed ignition system of testing engine. The designed timing curves were tested, and the results of engine power and torque were compared. In conclusion, the optimal timing curve is evaluated for this reciprocating engine.
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    Design and implementation of engine test device for the M601 engine
    (University of Žilina, 2023) Pukač, Andrej; Čerňan, Jozef
    The aim of this article is to create a proposal and documents for the implementation phase of the engine test device for the Walter M601 engine, which after implementation will serve as a teaching and research aid for researching new alternative fuels, testing different variants of propellers and others. As part of our work, we are dedicated to the development of two entire future test segments of device, namely the test stand and the design of the monitoring and regulation part, where we use the original devices, manufactured in compliance with LUN, which was directly designed in the past for the M601 engine and its installation in the L-410 Turbolet aircraft. The design of the test stand will include a 3D design and documentation. The monitoring part will consist of the design of the monitoring panel, which will contain selected engine indicators and LUN sensors, which will be used from the defined solutions of specific requirements and the design of electrical wiring and power sources and modules for the operation of the monitoring and regulation part.
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    Proposal and realisation of a modification to Al-9 engine for installing a free gas turbine
    (University of Žilina, 2023) Supuka, Matej; Čerňan, Jozef
    This paper focuses on the creation of a prototype connection of the AI-9 engine with a free turbine for creation of an experimental turboshaft engine. We go through theoretical knowledge about the issue in which we work on the basis of which we created solutions. We worked with the teaching aids of the Department of Aviation at the airport in Žilina. We prepared these tools for work in the workshop and we made minor adjustments to the engine to make it possible to carry out our work. In our work, we used a procedure called high-fidelity prototyping. This means that we created a digital model on which we applied solutions. We decided to transfer our prototype to the digital environment due to low financial and time costs. We faced several design problems, including the need for a stator, the gap between the guide tunnel and the rotor, or how to connect to other components. We managed to find preliminary solutions for these problems and created a digital prototype of the resulting assembly. Subsequently, we presented the positives of our results and the method of their application in practice.
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    Design and implementation of an alternative Rotax 915is engine management system
    (University of Žilina, 2023) Psárska, Vanesa Viktória; Čerňan, Jozef
    The content of this article is design and implementation of an alternative Rotax 915is engine management system. In my research, I worked with a wide-spectrum control unit ECU MASTER designed for the optimization of the injection time of spark-ignition engines and also the control of the ignition advance taking into account several sensors of engine input parameters. The article was created as part of research into the issue of optimal control of piston engines. Current methods of controlling engines and their systems, in principle, allow very precise control of important systems of modern piston engines, especially with regard to the ignition and fuel system. The inclusion of microprocessor units with multiple options for input parameters allow the control unit to take into account even less important parameters, which, however, help the control unit to keep the engine running smoothly while maintaining high combustion efficiency. The elaborated design of a possible alternative engine control system is subsequently connected with the practical realization of this control system. The result of the research is the design of the control system of the Rotax 915is engine and the subsequent practical production and adjustment of the control unit under the name ECU MASTER, which verifies the universal applicability of such a unit for various combustion engines.
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    Design of the system for the optimal composition of the fuel-air mixture of the M60 engine
    (University of Žilina, 2023) Koša, Dávid; Čerňan, Jozef
    The aim of article is to design a system for maintaining the optimal composition of the fuel-air mixture in an internal combustion engine, to describe in more detail the principle of mixture preparation with the help of carburation, and in connection with this to explain the issue of exhaust gas temperature. In the first part, the work deals with the function, then the construction, individual types of carburetor, direct and indirect fuel injection. In the second part, attention is paid to the mixture as such, its composition and especially the appropriate ratio of air and fuel. Subsequently, he deals with the issue of the temperature of the cylinder heads and the temperature of the exhaust gases, where he explains how exhaust gases are formed, what they are composed of and what effect they have on the independent operation of the engine. The last part is dedicated to the description of the experimental engine M60, in which the given parameters, construction and partially described development procedure of this experimental type of engine are briefly characterized, but also contains a proposal of a technical solution that will allow control of the composition of the mixture based on the analysis of exhaust gases.
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    Fuels for carbon neutrality in aviation
    (University of Žilina, 2023) Valášek, Denis; Čerňan, Jozef
    Aviation is one of the fastest-growing industries, but its contribution to greenhouse gas emissions cannot be ignored. In recent years, the development of alterna-tive fuels for aviation has gained increasing attention to reduce carbon emissions and achieve carbon neutrality. This thesis provides an overview of the current situation in aviation, focusing on the use of conventional jet fuels and the need for alternatives. Various types of alternative fuels for aviation are presented, including biofuels, syn-thetic fuels, and hydrogen. The dvantages and disad-vantages of each type of fuel are analysed, as well as the current production methods and their potential for com-mercial use. With a greater focus on biobutanol as an alternative fuel.
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    Weather and its impact on the work of rescue helicopters in terrain
    (University of Žilina, 2023) Zacharová, Alexandra; Čerňan, Jozef
    In the article it was necessary to define and clarify the basic theoretical knowledge and concepts in the field of aviation meteorology and also the technical and performance parameters of the rescue helicopters used in Slovakia. It was important to mention and clarify the elements of aviation meteorology that significantly affect the operation and reliability of the aircraft. Based on the theoretical aspects related to the issue, it was possible in the following chapters to proceed to the analysis and detailed examination of the impact of weather on the work of rescue helicopters, which was the main objective of the thesis. On the basis of the analysis of the activities and interventions of rescue helicopters from the past years and thanks to the clarified theoretical concepts, I was able to clarify the impact of weather on the number of emergencies requiring helicopter rescue medical service.
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    Analysis of technical modifications to enable combustion of gaseous fuel in a turboshaft engine
    (University of Žilina, 2023) Remšík, Matej; Čerňan, Jozef
    The aim of this article is to investigate the feasibility of modifying turboshaft engines for gaseous fuel combustion. With growing concern for environmental sustainability and oil price volatility, there has been an increase in need for alternative fuels with gaseous fuels emerging as a potential alternative for traditional hydrocarbon liquid fuels. This article examines the technical modifications required to enable combustion of gaseous fuels in a conventional turboshaft engine, including changes to the combustion chambers, mportance of flame stabilization and also provides an insight into the potential benefits and challenges of such changes to the turboshaft engines.
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    Design and implementation of the aerobatic fuel system of the M60 engine
    (University of Žilina, 2022) Horák, Tomáš; Čerňan, Jozef
    The paper deals with the specific modification of the M60 two-stroke engine so that the engine can be used in aerobatic conditions. In the introduction of the paper, the basic theory concerning piston two-stroke engines, the principle of operation of this engine, and the analysis of individual fuel systems is first discussed, with a focus on fuel injection systems and their components. Furthermore, the preparation of the fuel mixture is characterized together with the factors affecting it and also the basic characteristics of the engine control unit. In this way, the reader will gain the knowledge necessary for a better understanding of the following chapters. The motivation is to find a way to modify the non-aerobatic engine for the needs of aerobatic flight, and this modification includes a number of important advantages over the original fuel system design mentioned in the paper. At the core of the paper, we discuss the design of the fuel system, including important modifications, and also the practical implementation of this fuel system on the engine mentioned above. At the end of the paper, we evaluate the results of the work achieved by changing and modifying the fuel system on the M60 engine, including the achievement of the set objectives.
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    Design and implementation of equipment for partial use of combustion engine exhaust energy
    (University of Zilina, 2022) Szarowski, Alec; Čerňan, Jozef
    The content of the diploma thesis was the design and implementation of equipment for the partial use of exhaust gas energy of the internal combustion engine and the possibilities of using this equipment in internal combustion engines. The aim of this work is to design a scheme and 3D model of the converter for energy recovery from exhaust gases based on magnetohydrodynamics, and also to provide scientific information and inform the reader as much as possible about the theory of magnetohydrodynamics and the use of these theories in energy recovery. The work provides scientific information in the field of hydrodynamics, magnetohydrodynamics of engines and emissions and in the practical part is designed and built magnetohydrodynamic converter which was one of the main objectives of this work together with key information from the researched area and their application to the converter.