Práce a štúdie - Vydanie 09

Permanent URI for this collectionhttps://drepo.uniza.sk/handle/hdluniza/408

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Now showing 1 - 4 of 4

Aerodynamic airfoils and their applications
(University of Zilina, 2021) Kamenická, Daniela; Bugaj, Martin
This work focuses on aerodynamic airfoils and their application. The significant aim of this work is to introduce and analyse different types of airfoils and their importance. The first part of the paper examines aerodynamic characteristics, airfoil geometry and brings the historical evolution of certain types of airfoils. The second part of the paper considers different databases, and closely examines the NACA database and its numerical labelling by looking at digit series label, which follows the acronym NACA, indicating the airfoil's shape. The main body of the paperillustrates the real-life application of chosen airfoils by examining horizontal and vertical stabilisers and wind turbines. The last part of the paperpresents the analysis of the application of chosen wing root and wingtip airfoils.
Aerodynamic profile drag
(University of Zilina, 2021) Sabo, Matej; Bugaj, Martin
Higher awareness of aviation sustainability and environmental impact creates more research on profile drag reduction. The basic principles of aerodynamic profile drag are described and its role within the total drag. The boundary layer is defined using mathematical and physical principles of fluid dynamics. There are two types of movement inside the boundary layer: laminar and turbulent. In these, their impact on profile drag is analysed. The profile drag of a wing has two sources: form drag and friction drag. Applications with the most impact, throughout history, on both types of drag reductions were reviewed. Because most of the total drag comes from friction, researchers focus more on it compared to form drag. The significant way of reducing friction drag is postponing the transition of laminar flow into turbulent. The control of laminar flow became crucial for reducing friction drag. In the last two decades, European Union supported multiple projects concerning laminar flow control. These advancements in the field are starting to get implemented and tested on new aircraft by manufactures.
New trends in aircraft design
(University of Zilina, 2021) Jabrocká, Mária; Bugaj, Martin
Automation, robotic, unconventional arrangement hydrogen are the hallmarks of new trends in aircraft design. The implementation of hydrogen fuel in aircraft appears to be one of the biggest advances in the near future. Automation in aircraft control is based on the reduction of runway requirements. Among the main conclusions of the paper we include the finding that the aircraft does not have to have a classic conventional arrangement of vertical tail surfaces in order to achieve static/dynamic stability of the aircraft. The complexity of the elements of the aircraft stability and flight control system is directly depended on the weight of the aircraft. Upcoming trends in aircraft design should only based on existing concepts.
Simulations of aerodynamics
(University of Zilina, 2021) Novák, Miroslav; Bugaj, Martin
The aim of the paper is to approach the issue of simulations in aerodynamics. To describe the physical rules and basic mathematical equations, which are essential in the use of computing techniques. The paper deals with CFD (Computational Fluid Dynamics) and informations which are necessary for its understanding, the author further describes different software programs used for simulation purposes. By means of analyzing technical papers, the author compares and describes software considering to their practical use. The author also describes the aerodynamic tunnels and clarifies the basic issues related to aerodynamic tunnels and discuss factors that affect the resulting measurement quality. The author deals with methods of measuring individual physical quantities that are the interest of simulation or measurement. At the end of the paper, the author compares the specific aerodynamic tunnels and the possibilities of measurements that aerodynamics tunnels provide.