Powertrain

CFD simulation of GDI engine cold start

CFD simulation of cold start under extremely low ambient temperature in the internal combustion engine is very challenging due to both low evaporation and complicated evaporation processes of fuel. The objective of this study was to develop a computational tool to model evaporation processes of a wide range of multi-component fuels in the gasoline engines realistically and accurately. Particular interest was in GDI engine start operation under extremely cold conditions.

Durability analysis of fouled EGR cooler

Cooled exhaust gas recirculation (EGR) is effective for the reduction of NOx raw emissions of internal combustion engines. The required cooler has to be designed to efficiently reduce the exhaust gas temperature by several hundred K. The hot exhaust gas on the one side and the coolant on the other side cause strong temperature gradients in the cooler. This effect leads to locally different thermal expansion. In combination with pressure differences between gas and coolant, high stresses are induced into the cooler material.

Conjugated heat transfer simulation of a CVT

Within this work the thermal aspects of a continuously variable transmission (CVT) are investigated. Similar studies are hardly available in the current literature. Especially due to increasing engine power the design of a sufficient cooling system for the CVT is very important as the component temperatures are rising as well. Computational Fluid Dynamics (CFD) can be used to analyse the heat transfer effects within an enclosed CVT unit to ensure proper cooling.

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