3D CFD Simulation of a Cold Flow Four-Stroke Opposed Piston Engine

• Autor(a) principal: Gonçalves, Robert Silva
• Data de Publicação: 2014
• Tipo de documento: Dissertação
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10400.6/4931
• topic: Admission; Cfd; Exhaust; Fluent; Internal Combustion Engine; Opposed Piston; Domínio/Área Científica::Engenharia e Tecnologia::Outras Engenharias e Tecnologias

A CFD simulation of a four-stroke opposed piston engine has been performed. It is intended to evaluate the overall behavior and properties of in-cylinder flow, in a way that its use comercialy can be achieved. Due to the inherent characteristics of an opposed piston engine, it is necessary to dimension the model, using as reference the Jumo 205E engine: both valves, as well as the combustion chamber and both exhaust and admission ports. A combustion chamber adjacent to the cylinder zone is placed in order to fit both valves. The commercial software Fluent 14.0 is used to perform the numerical calculations. Due to the complexity of this study, mostly because of the existence of moving parts, the use o dynamic meshing is necessary. The viscous model is Standard K-E; the port entry and exit are defined as pressure-inlet and pressureoutlet, respectively. PISO and PRESTO! are the chosen methods for pressure-velocity coupling and pressure space discretization, respectively. The final results obtained were far from the expected, mainly due to the inadequate behavior and properties of the fluid within the cylinder and ports.