Thermal modeling of engines - Digital simulations

The file focuses on the phenomenology of heat transfer in internal combustion engines. Its extension describes the engine modeling in its entirety, with the exception of the boundary conditions: the fluxes transmitted to the walls by combustion (covered in ) and the flows generated by friction. It should be remembered that the final aim of this series is a global energy model of a diesel engine, enabling a complete engine with its cooling loops to be simulated. This model, associated with a mission profile and an external temperature environment, should make it possible to simulate the engine's thermal evolution over time, as well as its fuel consumption, for a given architecture and cooling loop control.

The present dossier will first present the boundary conditions linked to friction, then use the nodal concept to build a global thermal and fluidic network enabling simulations to be carried out, focusing either on combustion, or on the analysis of heat flows passing through the engine, and more generally simulations involving the engine in its entirety. This provides access to all the energy quantities concerning a powertrain, i.e.: fluid flow rates in each circuit, temperature at any point of the walls and fluids, flows exchanged over any surface, and - a new feature in such an approach - the engine's instantaneous consumption.