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Visualisation of Boundary Layer Separation and Passive Flow Control on Airfoils and Bodies in Wind-Tunnel and In-Flight Experiments
Popelka, Lukáš ; Kuklová, J. ; Šimurda, David ; Součková, Natálie ; Matějka, Milan ; Uruba, Václav
Infrared camera, Particle Image Velocimetry, smoke-wire, tuft filaments and oil-flow visualization techniques were used for wind-tunnel and in-flight investigation of boundary layer separation, both stall and separation bubbles, related to the low-Reynolds numbers transition mechanism. Airfoils of Wortmann FX66 series and FX66 series wing-fuselage interaction, as well as modern airfoils and their wing-fuselage geometry were subject to study. The presence of previously identified structures in the CFD modelling, such as horse-shoe vortices, was confirmed in the flow.
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Vznik a vývoj staveb
MATĚJKA, Milan
Tato bakalářská práce se zabývá problematikou stavebních slohů. Je rozdělena do dvou částí. Teoretická část je zaměřena na historii staveb dávných kultur. Jednotlivé stavební slohy jsou řazeny chronologicky za sebou od minulosti do současnosti. Přechod mezi první a druhou částí je tvořen kapitolou o výstavbě metra v Praze a její porovnání s tunelem Blanka. Praktická část se zabývá skutečnou realizací tunelu Blanka. Jsou zde popsány jednotlivé kroky výstavby toho tunelu. Dále je zde přiložena projektová dokumentace a názorné fotografie. Rozvoj tunelů stojí na vrcholu zájmu dopravního stavitelství a je jen otázka času kdy budou podobné stavby realizované i v regionálních městech.
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Visualization of Flow Separation and Control by Vortex Generators on an Single Flap in Landing Configuration
Součková, Natálie ; Kuklová, J. ; Popelka, Lukáš ; Matějka, Milan
This paper focuses on a suppression of the flow separation, which occurs on a deflected flap, by means of vortex generators (VG's). An airfoil NACA 63A421 with a simple flap and vane-type vortex generators were used. The investigation was carried out by using experimental and numerical methods. The data from the numerical simulation of the flapped airfoil without VG's control were used for the vortex generator design. Two sizes, two different shapes and various spacing of the vortex generators were tested. The flow past the airfoil was visualized through three methods, namely tuft filaments technique, oil and thermo camera visualization. The experiments were performed in closed circuit wind tunnels with closed and open test sections. The lift curves for both cases without and with vortex generators were acquired for a lift coefficient improvement determination. The improvement was achieved for several cases by means all of the applied methods.
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