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Kompresorový systém moderních turbodmychadlových motorů
Rajnošek, Jakub ; Zima, Martin (oponent) ; Šplíchal, Miroslav (vedoucí práce)
Bakalářská práce se zabývá inovacemi v kompresorových systémech moderních turbodmychadlových motorů a probíhajícími projekty, jejichž cílem je zvýšení účinnosti kompresorů. V první části jsou popsány základní parametry kompresoru s důrazem kladeným na účinnost. Druhá část zpracovává ztráty, které vedou k poklesu účinnosti. V třetí části jsou popsány příklady projektů a inovací, které se věnují oblasti zvyšování účinnosti kompresorů.
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Parametric study of casing treatment for turbine blade in aero engine application
Kníř, Jakub ; Popela, Robert (oponent) ; Karampelas, Stavros (vedoucí práce)
This present thesis addresses the question whether it is possible to obtain compressor’s performance increase with the aid of flow numerical simulations. The main objective is to extend the stable operating range of an axial single stage compressor by using passive flow control devices located on the compressor shroud. Firstly, it is examined the rotor’s tip leakage flow and after that, the overall performance without control. When reducing the mass flow rate, the simulation reveals an increased influence of tip vortex on the main flow. Additionally, large tip vortex is observed close to stall condition. Therefore, four different casing treatments are designed by implementing sinusoidal reshaping to control the tip vortex. Three out off four tested configurations showed ability to extend significantly the stall margin region. However, an increase in the operability had a penalty for the efficiency. On the end of the presented work recommendations are proposed for future research.
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Simple Rheoscopic Flows Used in Teaching Fluid Mechanics
Duda, D. ; Yanovych, Vitalii ; Uruba, Václav
Four simple demonstration experiments are presented. They are used as a support in the teaching of Fluid Mechanics I (a compulsory lecture at the University of West Bohemia in Pilsen). All mentioned experiments use the rheoscopic fluid obtained as a water solution of mica powder to visualize the flow in a esthetic way, which, as we hope, has a potential to attract students attention. The experiments are: demonstration of Bernoulli equation in a widening and narrowing channel, Taylor-Couette flow, the effect of viscosity to the scales and decay of turbulence, and the Galilean transformation inside an axial compressor.
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Kompresorový systém moderních turbodmychadlových motorů
Rajnošek, Jakub ; Zima, Martin (oponent) ; Šplíchal, Miroslav (vedoucí práce)
Bakalářská práce se zabývá inovacemi v kompresorových systémech moderních turbodmychadlových motorů a probíhajícími projekty, jejichž cílem je zvýšení účinnosti kompresorů. V první části jsou popsány základní parametry kompresoru s důrazem kladeným na účinnost. Druhá část zpracovává ztráty, které vedou k poklesu účinnosti. V třetí části jsou popsány příklady projektů a inovací, které se věnují oblasti zvyšování účinnosti kompresorů.
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Parametric study of casing treatment for turbine blade in aero engine application
Kníř, Jakub ; Popela, Robert (oponent) ; Karampelas, Stavros (vedoucí práce)
This present thesis addresses the question whether it is possible to obtain compressor’s performance increase with the aid of flow numerical simulations. The main objective is to extend the stable operating range of an axial single stage compressor by using passive flow control devices located on the compressor shroud. Firstly, it is examined the rotor’s tip leakage flow and after that, the overall performance without control. When reducing the mass flow rate, the simulation reveals an increased influence of tip vortex on the main flow. Additionally, large tip vortex is observed close to stall condition. Therefore, four different casing treatments are designed by implementing sinusoidal reshaping to control the tip vortex. Three out off four tested configurations showed ability to extend significantly the stall margin region. However, an increase in the operability had a penalty for the efficiency. On the end of the presented work recommendations are proposed for future research.
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