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Modeling the Impact of Piston Rings on Oil Consumption of Internal Combustion Engines
Raffai, Peter ; Pavlov,, Michal (oponent) ; Dr. Dan E. Richardson (oponent) ; Kučera, Pavel (oponent) ; Novotný, Pavel (vedoucí práce)
Within the frame of the present work a complex simulation tool was developed, built on strong physical and chemical foundations, supplemented with the appropriate mathematical approaches. The resulting software is capable of determining the performance of a piston ring pack by addressing all key mechanisms and their mutual influence during standard operating conditions of a piston ring. The outputs of the simulation were designed in accordance with industrial interest, like the volumetric gas flow through the piston assembly, the friction power losses and the lubricant oil consumption from the sources, which are affected by the piston ring pack. Besides the development of the simulation model, experiments were conducted with the intention of input data obtainment and results validation on an inline three-cylinder engine. Sample results were shown by applying the model to the parameters of the experimental engine. Possible industrial application of the source code is demonstrated with parameter studies. The work carried out within the frame of this doctoral dissertation was intended to fill the gap in the research area of combined simulation tools, able to support the needs of piston ring manufacturers and engine research centers, to calculate the impact of design parameter changes on friction losses and lubricant oil consumption simultaneously.
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Investigation of Transonic Flow through Linear Cascade with Single Blade Incidence Angle Offset
Fürst, J. ; Musil, Josef ; Šimurda, David
The contribution deals with numerical and experimental investigation of the effect of incidence angle offset in a two-dimensional section of a flat linear blade cascade in a high-speed wind tunnel. The aim of the work is to complement ongoing research of quasi-stationary approximation of aerodynamic flutter by examination of setups leading to transonic flow regimes. The numerical simulations were realized by finite-volume, in-house code developed on top of the open-source software package OpenFOAM. The experiments were conducted in correspondence with the setting of numerical simulations. The comparison of experimental and numerical data is presented on the isentropic Mach number distributions at various locations in the blade cascade. The description of transonic flow structures in the vicinity of blades is also provided.
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Experimentální ověření konceptu aktivního řízení proudu na profilu křídla
Novotný, Ondřej ; Zima, Martin (oponent) ; Popela, Robert (vedoucí práce)
Tato diplomová práce se zabývá experimentálním ověřením aktivního řízení proudu kolem profilu, které může být potenciální náhradou za vztlakovou mechanizaci. Práce obsahuje rešeršní část, ve které jsou představeny prvky zvyšující vztlak a podobné již provedené ex-perimenty. Další kapitola obsahuje přípravu měřící sekce s návrhem natáčecího zařízení a modelů profilu. Následně je popsáno měření jak čistého profilu, tak profilu při zapnutém aktivním řízení. V poslední kapitole byly představeny korekce a vyhodnocena naměřená data.
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Modeling the Impact of Piston Rings on Oil Consumption of Internal Combustion Engines
Raffai, Peter ; Pavlov,, Michal (oponent) ; Dr. Dan E. Richardson (oponent) ; Kučera, Pavel (oponent) ; Novotný, Pavel (vedoucí práce)
Within the frame of the present work a complex simulation tool was developed, built on strong physical and chemical foundations, supplemented with the appropriate mathematical approaches. The resulting software is capable of determining the performance of a piston ring pack by addressing all key mechanisms and their mutual influence during standard operating conditions of a piston ring. The outputs of the simulation were designed in accordance with industrial interest, like the volumetric gas flow through the piston assembly, the friction power losses and the lubricant oil consumption from the sources, which are affected by the piston ring pack. Besides the development of the simulation model, experiments were conducted with the intention of input data obtainment and results validation on an inline three-cylinder engine. Sample results were shown by applying the model to the parameters of the experimental engine. Possible industrial application of the source code is demonstrated with parameter studies. The work carried out within the frame of this doctoral dissertation was intended to fill the gap in the research area of combined simulation tools, able to support the needs of piston ring manufacturers and engine research centers, to calculate the impact of design parameter changes on friction losses and lubricant oil consumption simultaneously.
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