Heat Transfer

Parametric 3D model to evaluate different motors

Electric motors generate heat during their operation as a result of both electrical and mechanical losses. This emitted heat is essential to be removed in order to ensure the proper operation of the motor. The dissipation of the heat is achieved in most cases through conductive cooling (housing of the motor). To increase the outer heat exchange surface between the housing and the cooling medium usually fins are placed on the housing. Apart from their power electric motors may differ in the housing geometry (i.e. dimension, number and size of the fins etc).

Impact of wall heat transfer on engine behavior

The effect of thermal wall functions is discussed in terms of engine thermal balance, thermal state characterization and impact on engine performance. In particular, the newly implemented GruMo-UniMORE wall function is applied to improve the prediction of knock limit in SI engines and combustion behavior in CI engines.

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.