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Modern flow visualization techniques
Pištěcká, Kateřina ; Koutník, Tomáš (referee) ; Popela, Robert (advisor)
The subject of this bachelor thesis is an overview of the flow visualization methods applied in the wind tunnels and fly tests. An overview of flow visualization methods is presented in the first part of the work. The particular methods are presented and evaluated with respect of its complexity, requirements on the instrumentation and expanses. The pros and cons are mentioned for each method finally. The second part of the work deals with selection of the flow visualization method suitable for application in the wind tunnel of the Aeronautical department of the VUT Brno.
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Vizualization of liquid break-up from atomization nozzles
Janáčková, Lada ; Bělka, Miloslav (referee) ; Jedelský, Jan (advisor)
V oblasti mechaniky tekutin hraje vizualizace významnou roli. Fotografie poskytují vhled do zásad chování tekutin a obecně pomáhají k lepšímu pochopení fyzikálních procesů proudění. Tato práce se zabývá vizualizací rozpadu kapalin u rozprašovacích trysek. Práce popisuje základy rozpadu kapalin, stejně jako metody pro vizualizaci. Dále je v práci probrána a experimentálně testována analýza prvků ve vizualizačních metodách. Laboratorní testy byly provedeny na malé tlakové vířivé trysce určené pro spalování kerosinu v proudovém leteckém motoru a část experimentů byla provedena na tlakové spirálové trysce. Práce dokumentuje vliv zdroje světla na kvalitu fotografie. Chování spreje je navíc analyzováno pomocí makrofotografie se zaměřením na primární rozpad, který hraje hlavní roli v celém procesu tvorby spreje a sprejových charakteristik.
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Evaluation of functionality of ventilation outlet in passenger car cabin
Caletka, Petr ; Kamenský, Petr (referee) ; Jedelský, Jan (advisor)
This work engages in flow boundaries detection that flows from a car ventilation outlet. Smoke visualization was chosen for the flow visibility. There were applied three detection methods on the pictures with different types of quality. It was evaluated a suitability of these detection methods for the pictures with different types of quality. This suitability was evaluated based on the detected shapes of the flow and obviously based on the detected direction angles.
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Methods for determining aerodynamic properties of vehicles
Páleš, Patrik ; Blaťák, Ondřej (referee) ; Čavoj, Ondřej (advisor)
The aim of the bachelor’s thesis is a description of methods being used for measurements of aerodynamic characteristics of automobiles. The exact determination of the aerodynamic characteristics requires sophisticated testing equipment and advanced engineering procedures. The research comprises several approaches. Computational fluid dynamics (CFD) is based on turbulent models application such as RANS, LES and DNS. Pressure distribution on a vehicular body surface and an air flow along the vehicle are monitored in wind tunnels. Flow visualization is carried out by optical (PIV, LDA) and non-optical methods. Experimental road testing methods are focused on multiple parameters including a vehicle directional stability, its cross-wind sensitivity, engine cooling system and many others.
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Application of HS camera to problems of fluid mechanics
Bolcek, Adam ; Elcner, Jakub (referee) ; Jedelský, Jan (advisor)
The main subject of this bachelor thesis is visualization of liquids and gases and their recor-ding with the help of a high-speed camera. The first part deals with types of the high-speed cameras. Also, it is concerned with the description of the Olympus i-SPEED 2 camera which was used for the experiment. Finally, the thesis investigates fundamental parameters of the high-speed cameras and their influence on the recording. The second part describes different methods of visualisation of liquids and gases and also consequent advantages and disadvantages of using each particular method. The last part is dedicated to the creation of my own recording of the visualisation of flowing of gas and its analysis and also to the finding of an optimal setting of the camera and of the lighting of the scene of the recording.
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Flow visualization
Vavrla, Zdenek ; Šperka, Oldřich (referee) ; Rudolf, Pavel (advisor)
This bachelor´s thesis deals with fluid flow visualization methods in the air and water. First brief characteristic of the basic concepts of fluid flow is described, such as streamline, laminar and turbulent flow. The described visualization methods are divided into certain types and are used for fluid or gas. These methods provide a qualitative view of the flow and create the overview of the characteristics of gas or liquid flow. Some of these methods are simple and some are more complex. Finally, a simple experiment of liquids flow visualization is described by very powerful laser pointer.
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Flow visualization methods
Ďurdina, Lukáš ; Jedelský, Jan (referee) ; Lízal, František (advisor)
ĎURDINA, L. Flow visualization methods. Brno: Brno University of Technology, Faculty of Mechanical Engineering, 2010. 45 p. Thesis supervisor Ing. František Lízal. This thesis deals with fluid flow visualization methods with respect to their practical application possibilities. Chronological description of the historically valuable visualization experiments emphasises the role of visualization in the experimental fluid mechanics. A brief characteristic of the flow field contains mathematical description of the objects, which can be visualized. Visualization methods are divided into experimental and computer aided methods. Individual methods are ordered subsequently beginning with those with lowest requirements for equipment to the more sophisticated methods. Various techniques, which provide qualitative and quantitative description of the tested gas or liquid flow, are described. The overview for the choice of methods for various applications sums up the important facts from previous chapters. Description of a simple helium bubble flow visualization experiment realized in a lab can be found at the end of the thesis.
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Colloquium Fluid Dynamics 2014
Jonáš, Pavel ; Uruba, Václav
Selected results on theoretical and experimental fluid mechanics research at academic institutes, universities and other research and development establishments are presented in Colloquium Fluid Dynamics 2014 Proceedings. Seventeen contributions refer to the flow equations solutions, numerical calculations, flow visualization, investigations of shear flows dynamics, laminar turbulent transition, visualization in superfluid 4He, aerodynamic testing of supersonic blade cascades, fluidic oscillator etc.
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EXTRACTING INFORMATION ABOUT COHERENCE IN JET FLOWS
Tesař, Václav ; Něnička, Václav ; Šonský, Jiří
Several alternative approaches to processing jet flow visualization images were recently introduced by the authors. Common feature is processing a sequence of 2D images to detect presence and evaluate development dynamics of 3D vortical structures, which are recognised as regions that differ from the uncorrelated turbulent background in the processed pictures by their high negative values of correlation coefficient.
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