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Numerical simulation of flow and combustion in spark-ignition piston engine

Jasiński D., Gieras M.

Archivum Combustionis

2013

Vol. 33 nr 4

207--214

The The paper presents results of numerical simulations of combustion processes inside a piston engine with spark-ignition. The simulation was performed using ANSYS Fluent. For simulation of the combustion process, a new model of combustion, being an extension of a model available in the software, taking into account gas recirculation was proposed. This model was then implemented in the program Fluent by means of the User Defined Scalars and User Defined Functions. As the object of analysis, Fiat FIRE 1108 engine was used. Comparison of the basic engine parameters, obtained from the simulations with actual engine performance, indicates a fairly good agreement, and thus possibility of applying of this approach in a simplified simulation of spark-ignition engines.

Computational study of an aerodynamic flow through a micro-turbine engine combustor

Gieras M., Stańkowski T.

Journal of Power Technologies

2012

Vol. 92, nr 2

68--79

The study presents 3-D numerical simulations of aerodynamic flow inside micro-turbine engine combustion chamber. The process of creation of a numerical grid and its properties are described, and then on the basis of gas-dynamic calculation of the theoretical engine cycle boundary conditions were specified. For the assumed boundary conditions, numerical simulations of aerodynamics of "cold" air flow through the combustion chamber (without fuel supply to the interior) were performed. Numerical experiment was also conducted, allowing the investigation of the influence of thermal energy supply into the combustion chamber on the aerodynamic flow through the chamber. The work ends with discussion of the results, in particular concerning the loss of pressure in the combustion chamber and possible design changes to minimize them.