O processo de admissão e exaustão exercem grande influência no desempenho de um motor a combustão interna. Vários têm sido os estudos para conhecimento e detalhamento do comportamento dos parâmetros que interferem nesses processos, nas últimas décadas. Este trabalho voltou-se principalmente para o ensaio experimental de um motor do ciclo Otto utilizando etanol como combustível, avaliando o desempenho deste motor utilizando três tipos distintos de comando de válvulas e dois coletores de admissão diferentes em sua geometria, além do uso da turbo - alimentação. Numa etapa complementar fez-se uma proposta inicial de simulação numérica do comportamento hidrodinâmico do escoamento na admissão, usando técnicas de CFD, através do software CFX. Os resultados experimentais permitiram apontar o melhor arranjo não só sob o ponto de vista de torque, potência e consumo específico, como também, o que apresentou menor índice de emissões para os gases CO, CO2, NOx, HC. Criou-se um farto banco de dados para subsidiar pesquisas em motores movidos a etanol, material escasso na bibliografia aberta. A simulação numérica apresentou concordância com alguns parâmetros medidos, mas merece ainda alguns ajustes no refinamento da malha, no tempo de simulação, e no número de ciclos ensaiados, para comprovação e maior confiabilidade nos resultados obtidos. / Intake and exhaust process exercise great influence in Internal Combustion Engine performance. The behaviour of parameters that interfere in this process have been studied in the last decades. The mainly goal of this work is to test experimentally a cycle Otto engine that use ethanol as fuel, evaluating its performance using three different types of the camshaft and two intake manifold of different geometry, besides the use of the turbocharger. In addition an initial proposal numeric simulation of the hydrodynamic flow behaviour in intake, using techniques of CFD with the software CFX was made. The experimental results allowed to aim the best arrangement of the torque, specific consumption and power and what presented lower index of emissions for the gases CO, CO2, NOx, HC. A full database was created to subsidize researches in engines powered ethanol. The numeric simulation presented agreement with some measured parameters, but it still deserves some fittings in the refinement of the mesh, in the time step of simulation and in the number of rehearsed cycles, for confirmation and larger reliability in the obtained results.

O processo de admissão e exaustão exercem grande influência no desempenho de um motor a combustão interna. Vários têm sido os estudos para conhecimento e detalhamento do comportamento dos parâmetros que interferem nesses processos, nas últimas décadas. Este trabalho voltou-se principalmente para o ensaio experimental de um motor do ciclo Otto utilizando etanol como combustível, avaliando o desempenho deste motor utilizando três tipos distintos de comando de válvulas e dois coletores de admissão diferentes em sua geometria, além do uso da turbo - alimentação. Numa etapa complementar fez-se uma proposta inicial de simulação numérica do comportamento hidrodinâmico do escoamento na admissão, usando técnicas de CFD, através do software CFX. Os resultados experimentais permitiram apontar o melhor arranjo não só sob o ponto de vista de torque, potência e consumo específico, como também, o que apresentou menor índice de emissões para os gases CO, CO2, NOx, HC. Criou-se um farto banco de dados para subsidiar pesquisas em motores movidos a etanol, material escasso na bibliografia aberta. A simulação numérica apresentou concordância com alguns parâmetros medidos, mas merece ainda alguns ajustes no refinamento da malha, no tempo de simulação, e no número de ciclos ensaiados, para comprovação e maior confiabilidade nos resultados obtidos. / Intake and exhaust process exercise great influence in Internal Combustion Engine performance. The behaviour of parameters that interfere in this process have been studied in the last decades. The mainly goal of this work is to test experimentally a cycle Otto engine that use ethanol as fuel, evaluating its performance using three different types of the camshaft and two intake manifold of different geometry, besides the use of the turbocharger. In addition an initial proposal numeric simulation of the hydrodynamic flow behaviour in intake, using techniques of CFD with the software CFX was made. The experimental results allowed to aim the best arrangement of the torque, specific consumption and power and what presented lower index of emissions for the gases CO, CO2, NOx, HC. A full database was created to subsidize researches in engines powered ethanol. The numeric simulation presented agreement with some measured parameters, but it still deserves some fittings in the refinement of the mesh, in the time step of simulation and in the number of rehearsed cycles, for confirmation and larger reliability in the obtained results.

The master’s thesis is focused on creating a thermodynamic model of the diesel engine for heavy commercial vehicle. After the model was created, new intake and exhaust pipes are designed based on simulations. Those proposed pipes variants are compared with the series design. After evaluating individual variants, the final version of the new pipes is selected and 3D model for this version is created.

The main aim of this diploma thesis is to design two different types of air throttles in the intake manifold and compare their influence on a loss of dynamics of the flow of drawn air. The main purpose is to compare the mass flow for wholly opened air throttle. It deals with creating CDF model of intake manifold by using 3D scanner Atos and software Pro/Engineer WF5. During the work, the results of the CFD analysis were used for a real testing.

This master’s thesis deals with the design of the throttle body of the intake manifold of a spark-ignition engine with regards to minimizing throttle loses at full engine load. The first part of this thesis focuses on the elements of intake tract structure on contemporary combustion engine including their design solutions and the theory of flow. The thesis also describes the creation of the 3-D CAD model of intake manifold with a throttle body and the description of the CFD flow simulation with the evaluation of resul.

The master´s thesis is focused on the design of the intake and exhaust ducts for V8 engine. Home work is focused on the description of the construction of the intake and exhaust pipes for a given engine. Another part deals with creating a thermodynamic model of the engine, and the design of the intake and exhaust pipes. The last part deals with verifying the proposed pipeline construction.

The work deals with design solutions to the intake manifold modern contemporary internal combustion engines. Then describes the types of flow and structural design of ports, including the intake of their basic properties. The thesis also compare the results of the analysis and design optimization based on simulation of flow inlet port and measure the actual inlet port.

Diplomová práce je zaměřena na konstrukční návrh sacího potrubí pro vůz Formula Student. Pro pohon vozu je použit jednoválcový atmosférický benzinový motor Husaberg FE 570. Sací potrubí je navrhováno tak, aby bylo v souladu s pravidly Formula Student. Pro zvýšení plnící účinnosti sací potrubí využívá resonančního efektu. Délky sacího potrubí byly spočítány v software Lotus Engine simulation.

The aim of this diploma thesis is supercharging of SI engines and design influence on performance. The main objective of this thesis is to propose appropriate modifications on AR67203 engine of Alfa Romeo 155Q4 personal vehicle in order to achieve significantly better performance parameters and a constant torque in the widest possible speed range. That is why I analyze design and modifications that affect the overall engine performance and their appropriate application to the selected engine. An important point of this thesis is the right choice of turbocharger, in order to have an effective cooperation with a modified engine. The calculation study and the simulation in Lotus Engine Simulation software serve this purpose. I also give information about ECU programming. The results, as well as a practical output in the form of measured performance parameters of modified engine, are evaluated at the end.

Aim of the diploma thesis is to design intake ducting with variable cross-section for 16V diesel engine consisting from divided intake manifold and divided ejector. Cross-section variability is ensured by a swirl flap placed in the divided ejector. Next aim of thesis is to provide drawing documentation for production of samples. For designing was used PTC Creo system and software GeomCaliper. Also was taken account of manufacturing of the parts with sand-casting, especially to guarantee trouble-free taking out of models from the moulds, and taking out of cores from core moulds, and also for machinability of some elements. Introduction of thesis is focused on diesel engine emissions and ways of their reduction.