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Laser Doppler anemometry
Osička, Tomáš ; Lízal, František (referee) ; Jedelský, Jan (advisor)
This bachelor thesis deals with laser Doppler anemometry (LDA). It is a modern, non-intrusive flow measurement technique. The work deals with theoretical principles and components of the method. The experimental part is devoted to setting of the system. Vector plot and profile plot display the measurement results.
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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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Measuring of Operational Risk in Finacial Institutions
Voříšek, Martin ; Žváčková, Lenka (advisor) ; Kozáková, Markéta (referee)
The aim of this submitted work deals with situation which quite recently occured on financial markets. In 2001, Basel Commitee for Banking Supervision declared that banks had to cover their exposure to a not very well-known operational risk. This work consists of a five main parts. After a few introductory words comes a short chapter about risks generally. Second part repeats some basic economic terms in territory of market failures and then discusses these particular problems in the field of financial markets. Following part brings a view on regulatory documents -- their past, their present and their possible future. A chief attention should be aimed on fourth part. It analyzes operational risk with a focus on its definition, its specifics, examples of its impacts and methods of its control, mitigation, measuring and managing. Last chapter describes one of advanced approaches to measure operational risk. At the end, there are a few last words concerning some questionable areas and future of operational risk management.
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Srovnávací studie měřících technik ADV a LDA
Chára, Zdeněk ; Matoušek, V.
The contribution compares measurements of local velocities for water flows of different configurations carried out with the help of the ADV (Acoustic Doppler Velocimeter) and LDA (Laser Doppler Anemometry) measuring techniques. Three different geometrical configurations were tested – open channel flow, flow behind a rectangular cylinder and flow behind a hole in a plate.
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Symetrie turbulentních charakteristik uvnitř městské křižovatky
Kellnerová, Radka ; Jaňour, Zbyněk
The wind-tunnel modelling of dispersion is very sensitive to central symmetry. The asymmetry of concentration field inside the symmetrical model is often caused by two causes: inappropriate inlet conditions or non-symmetric set-up of model. The project has carried out the flow measurements by Laser Doppler Anemometer's probe merged into the tunnel. The aim was to investigate the flow processes inside the tunnel body-tube itself – i.e. without the model and inside the model of a symmetrical urban intersection. The influence of wind direction and model arrangement suppressing the lateral flow was tested. The largest deviations from symmetry were caused by the circumfluence of the measuring devices.
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Image analysis in an agitated particle - liquid transparent system
Ditl, P. ; Severa, Miroslav ; Šedivý, V.
Large tall vessels with a draught tube are used for the mixing of suspensions especially in cases where high homogeneity and heat tranfer are desirable. The article describes flow behaviour of liquid in the vessel with a draught tube. LDA method (Laser Doppler Anemometry) was used for measurement axial velocity profile. The experimental configuration for LDA method was produced by firm DANTEC. Experimental results are compared with numerical simulation and other experiment.
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LDA measurement of axial velocity profile in tall vessels with a draught tube
Brož, J. ; Severa, Miroslav ; Jirout, T. ; Rieger, F.
Large tall vessels with a draught tube are used for the mixing of suspensions especially in cases where high homogeneity and heat tranfer are desirable. The article describes flow behaviour of liquid in the vessel with a draught tube. LDA method (Laser Doppler Anemometry) was used for measurement axial velocity profile. The experimental configuration for LDA method was produced by firm DANTEC. Experimental results are compared with numerical simulation and other experiment.
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