|
|
Over-expanded internal-combustion engines
Novotný, Pavel ; Janoušek, Michal (referee) ; Drápal, Lubomír (advisor)
At the beginning there is a short history of over-expanded engines. Subsequently, the thermodynamics of ideal over-expanded cycles are analysed and compared with the ideal Otto cycle. The thesis also deals with some design solutions for achieving over-expansion in an internal combustion engine. In the thesis there are also selected over-expanded engines from leading world carmakers. At the end the thesis deals with systems with variable compression ratio.
|
|
|
Camshaft design for Miller cycle engine
Dúlovcová, Gabriela ; Beran, Martin (referee) ; Svída, David (advisor)
The main aim of this thesis is the analysis of influence of inlet valve opening length and compression ratio on performance and thermodynamic parameters of Miller cycle using GT-SUITE software. Next step was an optimization of inlet and exhaust valve timing with goal of increasing motor effective power. For chosen option was designed cam shaft with regard of kinematic and dynamic magnitude courses.
|
|
|
Modification of a motorcycle spark ignition engine
Poulíček, Matěj ; Ramík, Pavel (referee) ; Kaplan, Zdeněk (advisor)
This diploma thesis is about possible modifications of four-stroke motorcycle petrol engines for increasing power. It also deals with the modification of the Aprilia Leonardo 250 engine from a 2-valve variant to a 4-valve variant, the simulation of this engine and the proposed solution in the GT SUITE. Attention is also paid to the strength control of the crank mechanism of the engine.
|
|
| |
|
|
Miller cycle in nonstationary modes
Švanigová, Lenka ; Šebela, Kamil (referee) ; Štětina, Josef (advisor)
This diploma thesis deals with the assessment of the influence of valve timing, regulation of the lambda coefficient, fuel delivery and ignition advance on the course of the engine torque and the response of the turbocharger during a transient acceleration event of a loaded engine. The model of the investigated VW 1.5 TSI EVO 110 kW gasoline engine with the Miller cycle was created in the GT-Suite program and was used to simulate the transient acceleration event of the loaded engine and evaluate the influence of the mentioned parameters. For the simulated transient, the influence of the turbocharger regulation method was compared, using the wastegate and the variable nozzle turbine.
|
|
|
Parameters for 1D Single Cylinder Engine Simulation
Stryja, Štěpán ; Šebela, Kamil (referee) ; Janoušek, Michal (advisor)
The relationship between the 1D simulation and the corresponding input parameters is addressed in the paper. The one-dimensional simulation is demonstrated in the GT-Power environment. The work deals with both experimental and computational analysis of the input parameters. Additive methods of 3D printing of fixtures and subsequent measurement of volumetric flow rates on a Superflow Flowbench SF-260E purge station were used. This procedure led to the final calculation of discharge coefficients. The 3D scanning method, using ATOS 2M equipment, together with subsequent data processing, using the appropriate software, led to the analysis of the valvetrain mechanism and the construction of its kinematics. The practical part was demonstrated on two-cylinder heads of a four-stroke single cylinder engine with a displacement of 125 cm3, with natural aspiration. One of the heads was modified, resulting in volumetric flow increase of 29 % in case of the intake and 15 % in case of the exhaust, compared to the stock head. The work led to the acquisition of key input data for the 1D simulation of the aforementioned engine.
|
|
|
Modification of a motorcycle spark ignition engine
Poulíček, Matěj ; Ramík, Pavel (referee) ; Kaplan, Zdeněk (advisor)
This diploma thesis is about possible modifications of four-stroke motorcycle petrol engines for increasing power. It also deals with the modification of the Aprilia Leonardo 250 engine from a 2-valve variant to a 4-valve variant, the simulation of this engine and the proposed solution in the GT SUITE. Attention is also paid to the strength control of the crank mechanism of the engine.
|
|
|
Camshaft design for Miller cycle engine
Dúlovcová, Gabriela ; Beran, Martin (referee) ; Svída, David (advisor)
The main aim of this thesis is the analysis of influence of inlet valve opening length and compression ratio on performance and thermodynamic parameters of Miller cycle using GT-SUITE software. Next step was an optimization of inlet and exhaust valve timing with goal of increasing motor effective power. For chosen option was designed cam shaft with regard of kinematic and dynamic magnitude courses.
|
|
|
Over-expanded internal-combustion engines
Novotný, Pavel ; Janoušek, Michal (referee) ; Drápal, Lubomír (advisor)
At the beginning there is a short history of over-expanded engines. Subsequently, the thermodynamics of ideal over-expanded cycles are analysed and compared with the ideal Otto cycle. The thesis also deals with some design solutions for achieving over-expansion in an internal combustion engine. In the thesis there are also selected over-expanded engines from leading world carmakers. At the end the thesis deals with systems with variable compression ratio.
|
|
| |
guest ::
