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Alternative conceptions of combustion engines
Šťáva, Martin ; Fojtášek, Jan (referee) ; Zháňal, Lubor (advisor)
The subject of this bachelor´s thesis on the topic Alternative conception of combustion engines is description of chosen historical and present alternatives to conventional piston combustion engine with crankshaft. The aim of this thesis is to create thesis that relates description of historical evolution of alternative construction combustion engines. Alternatives are described in terms of construction, operating principle and properties. In past were developed plenty of different conceptions of combustion engines. However most of them have never been successful because of many technical problems, complicated construction or other shortages.
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Piston for 25 kW 2-stroke SI-engine
Bečka, Petr ; Dundálek, Radim (referee) ; Svída, David (advisor)
This bachelor thesis deals with a design of a piston for 25kW motorcycle engine. The work is focused to main dimension of piston, dimension of crank mechanism and strenght calculation of dangerous crosses. Piston would be able to work during common conditions of running.
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Piston for 50kW 4-stroke SI-engine
Spáčil, Tomáš ; Dundálek, Radim (referee) ; Svída, David (advisor)
This bachelor thesis deals with a primary proportions calculation design of the engine and a constructional piston design for four-stroke spark-ignition engine. It is also contains a design of crank mechanism and engine primary proportions. On the basis of empirical data I projected the piston primary proportions. Furthermore, this thesis deals with the solidity check of critical piston crosscuts according to the crank mechanism.
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Powertrain of experimental single-cylinder spark ignition engine
Laštovica, Karel ; Novotný, Pavel (referee) ; Píštěk, Václav (advisor)
These bachelor’s thesis deals with experimental single-cylinder engine, calculation of his thermodynamic cycle, design of a piston, design of a can rod eye and his strength check. In introduction there is states function principle of combustion engine and their basic division and application. The bachelor’s thesis consists of five parts: scheduled initiatory parameters, calculation of thermodynamic cycle, calculation of the piston group weight, calculation of forces reacting to piston group and strength check of con rod eye. In the conclusion results of calculation are evaluated.
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Piston for 66kW 4-stroke CI-engine
Mikulka, Václav ; Dundálek, Radim (referee) ; Svída, David (advisor)
The content of this baccalaureate work is to make computational proposal and constructional design of the four-stroke diesel engine piston. At the beginning it shortly describes the piston as a part of a piston assembly, basic constructional design of pistons for diesel engines, piston material and the way of production. Further there is a proposal of basic engine dimensions and the crank mechanism. Then there is an elaborated piston dimension on the basis of empirical data. At the end of the work there is a calculation of critical piston cross-sections calculated according to given process of the indicator diagram and designed kinematics of crank mechanism.
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Powertrain of in-line five-cylinder spark ignition engine
Hájek, Daniel ; Rauscher, Jaroslav (referee) ; Píštěk, Václav (advisor)
Objective of bachelor’s thesis is, for noted geometric, thermodynamic and operation parameters cylindrical unit of five-cylinder spark-ignition engine, perform calculation of thermodynamic cycle, project basic proportion of piston group and for noted operation modes perform strength check of connecting-rod eye. Rated value verify, if corresponded with true value of spark-ignition engine. In preamble is stated basic use of spark-ignition engines, their operation principle and design concept. The bachelor’s thesis is consists from description of calculation and supplement, where is calculation done. The calculation is consists from three parts. The first part is calculation of thermodynamic cycle, in the second part are calculated forces reacting to piston group and third part is strength calculation and check of connecting-rod eye. In the last part is results evaluation of calculation, show a methods of calculation and a new trends spark-ignition engine of evolution.
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Valveless Plunger Pump
Machů, Tomáš ; Kozubková, Milada (referee) ; Melichar, Jan (referee) ; Pochylý, František (advisor)
This thesis deals with valveless reciprocating pumps. Within the thesis several designs of pump geometry are demonstrated. Their parameters were obtained using computational fluid dynamics. Reciprocating piston movement was simulated by time dependent inlet boundary condition or by dynamic mesh. The individual variants were compared mainly from point of view of volumetric efficiency, which was the main evaluated parameter. Results of calculations are presented as dependencies of volumetric efficiency on frequency and amplitude of piston motion and on value of backpressure. Two variants of the prototype pump geometry were manufactured to experimentally validate parameters obtained from calculations. Volumetric efficiency together with hydraulic efficiency were evaluated from measured data.
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Piston of 4-storke supercharged SI-engine for passenger car
Procházka, Miloslav ; Dundálek, Radim (referee) ; Svída, David (advisor)
This thesis is engaged in a design of basic dimension of four-stroke four- cylinder DI (direkt injection) petrol engine. It is also engaged in a design of basic dimension of crank mechanism and in a design of piston dimension. Next suggestion is related to dangerous section check. The sequential multipoint injection and boosting will be supposed for the suggestion calculation. Part of this thesis is focused on the engine development and a piston cluster detail description.
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