Momentum, Heat and Mass Transfer in Exhaust Gas Sensors at Engine Operating Conditions

Abstract

Momentum, Heat and Mass Transfer in Exhaust Gas Sensors at Engine Operating ConditionsKnowledge of all relevant parameters affecting function and load is a precondition for optimal engineering of exhaust gas sensors. Access to those parameters by measurement is difficult and often impossible. Thus the development of a validated model to simulate operating behaviour of exhaust gas sensor was the aim of this work. Coupling of a 1D-engine simulation with a 3D-CFD simulation is done to predict convective momentum, heat and mass transfer to the sensor surface. Being results from coupled simulations, transient boundary conditions are applied to a further 1D-model to predict mass transfer inside the sensor. Signals of two exhaust gas sensors were simulated.