|
|
Rotary Piston Engine for Small Mobile Systems
Drbal, Milan ; Puškár, Michal (referee) ; Žák,, Marek (referee) ; Píštěk, Václav (advisor)
The dissertation deals with the issue of 1D modelling of a rotary piston engine and prediction of engine characteristics for use in its further development. In this work, the 1D mathematical model of the engine is validated by measuring the combustion pressure in the work chamber, in the intake section and further in the exhaust channel. These data are used to determine the coefficients of the combustion model and, above all, the combustion chamber leakage model. Both effects cannot be modelled accurately included without measuring the work chamber pressures. The use of 1D mathematical simulations is well described in the literature for a reciprocating engine. However, their use for a rotary piston engine is more complicated from the point of view of the geometric differences of both types of engines. In this work, a suitable method of modelling rotary piston engines and their verification using technical experiments and CFD simulations will be described.
|
|
|
Thermodynamic 1-D model of the turbocharger of an internal combustion engine
Mrázková, Kristýna ; Böhm, Michael (referee) ; Štětina, Josef (advisor)
Master thesis deals with 1D heat transfer simulation of turbine housing laying emphasis on temperature of exhaust gas leaving the turbine. The thesis covers construction and thermodynamics of turbochargers, exhaust gas aftertreatment and heat transfer simulation software. Then the thesis focuses on exploring turbine housing 3D model discretization, building physical turbocharger model for 1D simulation of exhaust gas output temperature and heat transfer through turbine housing. Heat transfer coefficients were calibrated for transient simulation predicting temperature of output exhaust gas in compliance with NEDC cycle. Results analysis and optimization follow, a suggestion on model integration into the virtual turbocharger system is also included.
|
|
|
Thermodynamic model of Wankel engine with output power 11 kW
Drbal, Milan ; Beran, Martin (referee) ; Svída, David (advisor)
The master’s thesis deals with the Wankel rotary engines and their 1D simulations using a thermodynamic simulation software for the piston engines. The necessary steps for creation of the equivalent model of the four-stroke three-cylinder combustion engine are provided. The engine used for the validation model was Aixro XR 50. The data measured on this engine during testing were used to validate the created thermodynamic model. The discharge coefficient calculation of the intake and the exhaust ports is shown. The 11kW engine design is created using validated thermodynamic model.
|
|
|
Spark-ignition engine concept for hybrid passenger car
Břoušek, Roman ; Böhm, Michael (referee) ; Drápal, Lubomír (advisor)
Thesis aims on calculating method of engine conception for hybrid power train usage. Aim is to describe briefly overview of common combustion engines in hybrid power trains of the passenger cars. According this overview a proposal of naturally aspirated spark ignition combustion engine by specified parameters in 1-D CFD will be made, while the effort is to take into account less complexity and production costs at the same time higher efficiency in the most load modes.
|
|
|
Matching of a Turbocharger to a Combustion Engine
Vondrák, Adam ; Beran, Martin (referee) ; Svída, David (advisor)
The master’s thesis deals with methods of matching of a turbocharger to a combustion engine and with the analysis of their mutual cooperation. Besides a methodology of analytical determination of the appropriate size for compressor and turbine stage, there was created a thermodynamic model of an engine that is to be used as a means of propulsion for a prototype single-seater for the competition Formula Student. Post processing of real engine data measured on a dyno helped to create a parameter database that could be used for validation of the thermodynamic engine model and for deeper understanding of the system’s internal processes.
|
|
|
Motorcycle rotary engine
Slíva, Jakub ; Dlugoš, Jozef (referee) ; Zháňal, Lubor (advisor)
This master's thesis describes a concept of Wankel type rotary engine for use in motorcycle with estimated power between 70 – 80 kW. Basic geometry parameters of rotor and ports are calculated. Power output is then checked on equivalent piston combustion engine with central crank mechanism in 1D simulation model. Rotor is designed for use with oil cooling system. Rotor is checked for safe design by static FEM analysis by applying maximum pressure found out of 1D simulation model.
|
|
|
Supercharging design for a 1.6L SI Engine
Švábíková, Anna ; Bazala, Jiří (referee) ; Beran, Martin (advisor)
This master’s thesis focuses on the problematics of supercharging of SI engines aiming on performance boost. The aim of this thesis is to propose a suitable turbocharger for reaching defined performance goals. A method of successive SI engine modelling process is proposed, using the GT-Power platform. The choice of suitable turbocharger is based on a analytic calculation of required turbocharger parameters. The cooperation of the engine with the chosen turbocharger is verified by simulations. An important part of this thesis is sensitivity analysis, which purpose is to determine the impact of changing chosen parameters on maximum pressure in the combustion chamber and on the exhaust gas temperature.
|
|
|
Computational Study of the Miller Cycle on a Gasoline Engine with a Turbocharger
Černý, Roman ; Janoušek, Michal (referee) ; Vondrák, Adam (advisor)
The scope of this thesis is the Miller engine cycle analysis and its practical application on a turbocharged spark ignited engine. Based on the sensitivity analysis of the limits affecting the ideal Miller cycle thermal efficiency a thermodynamic model of the engine with a prolonged expansion was set up in the GT-POWER software. The results of the analyses were used to evaluate the feasibility of the reference engine conversion for an operation with Miller cycle.
|
|
|
Thermodynamic 1-D model of the turbocharger of an internal combustion engine
Mrázková, Kristýna ; Böhm, Michael (referee) ; Štětina, Josef (advisor)
The thesis deals with 1D heat transfer simulation of turbine housing laying emphasis on temperature of exhaust gas leaving the turbine. The thesis covers construction and thermodynamics of turbochargers, SCR catalysts and 1D simulation software. Then the thesis focuses on exploring turbine housing 3D model discretization, building physical turbocharger model for 1D simulation of heat transfer through turbine housing with time dependent input values and predicting temperature of exhaust gas flowing through turbine outlet in compliance with NEDC cycle. Result analysis and a suggestion of subsequent actions follow.
|
|
|
Exhaust Manifold for 600ccm Engine
Řezáč, Vojtěch ; Beran, Martin (referee) ; Svída, David (advisor)
In this bachelor’s thesis I am comparing affect of different exhaust mufflers on parameters of Yamaha FZ6 Fazer’s motorcycle engine. I am focusing on power, torque, volumetric efficiency, brake measure effective pressure and brake-specific fuel consumption. Theese data were taken from simulations made in special software. Theese parameters are measured for three types of exhaust mufflers, original, tuned by Devil company with catalytic converter and without catalytic converter. Result of this thesis is to compare simulated data for two types of motorcycle riders, one who prefers touring style of riding and for one who prefers sport style of riding
|
guest ::
