Žilinská univerzita v Žiline

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    Didaktické pomôcky veterného tunela
    (University of Žilina, 2024) Hronská, Marta; Pecho, Pavol
    The aim of the paper is to approach the issue of the flowing around didactic tools in the wind tunnel. Didactic tools are used for education and help in understanding the issue of aerodynamics. In the first part, the paper deals with theoretical knowledge about the wind tunnel and then describes the theory and laws of aerodynamics. The core of this work is the analysis of the given objects realized through numerical and experimental methods. By using CFD simulation of didactic tools, it was possible to obtain aerodynamic drag values, from which the values for the drag coefficient were calculated and then compared with tabular values from theory. Experimental verification of individual objects was carried out in a wind tunnel located at the Department of Air Transport in Dolný Hričov. The result of tests in the wind tunnel was the visualization of the air flow around the didactic aids. At the end of the work, both methods were compared and the reasons for deviations and inconsistencies were described.
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    Noise optimisation of aircraft jet engines
    (University of Zilina, 2022) Veľký, Patrik; Pecho, Pavol
    Aviation industry is source of noise, which has negative impact to human health and significantly influences surrounding fauna and flora. Nowadays tendency and also a need of higher care about environment concerns the aviation sector as well, which has eminent negative aspects to environment. This study is concentrated on concept solution of changes of jet engine´s output parameters, especially focused on noise emissions, using shape changes of nozzle of created 3D jet engine model, what allows simpler, economic undemanding, but relevant resulting analyse of fluid flow through the engine. Object of the research is influence of the nozzle shape to the created noise effect, which was made by fluid flow going through this shape. The goal of the study is to make and analyse as much as possible ideal shape characteristics of jet engines with the reference to the noise. The result is evaluation of possibility to do some kinds of research and analysis of jet engines on 3D models of jet engines, their comparison with reference to another parameters, such as: thrust or fuel consumption. To completing research were used facilities, devices and places of Air Department, also necessary tools and other stuff which belongs to the owner of this study. For modelling 3D model of engine and nozzle shapes, was used computer software and production of these shapes allows 3D printer. Used methods for creating nozzles are with regards to real shapes of engine. Results and conclusions of this research are appropriate to be used in praxis of air or another industry, whose purpose is utilizing thrust units. With application of these data is possible the achieve reduced noise of certain unit, with some changes of other parameters, such as: increased or decreased fuel consumption or thrust, according to the initial requirements. Moreover, these results can be used not only for industrial purposes, but also are relevant for economics.