In this work, the thermal behavior of a new Exhaust Gas Recirculation (EGR) valve, installed on a series Diesel engine, was examined to identify effective thermal loads on it, during its real operation. Both theoretical tools and experimental set-up were used to achieve feasible results. The two different theoretical approaches used were respectively at steady and unsteady operation. They were set-up to account for the complex thermal resistances network, due to different materials used and for the interaction of heat loads on components, due to their different thermal inertia and the characteristic operation of the valve, modelling both conduction and convection phenomena. Some tests on a engine bench have been carried out to validate theoretical models. An instrumented EGR valve was used, provided with thermocouples mounted on particular locations, inside and outside the valve. A good matching between theoretical and experimental results was found. Critical components were located in terms of reached thermal limits and a basis for improvement proposals was defined to reduce valve failure, due to thermal loads.
EGR valve thermal behaviorTheoretical and experimental analysis
STARACE, Giuseppe;
2010-01-01
Abstract
In this work, the thermal behavior of a new Exhaust Gas Recirculation (EGR) valve, installed on a series Diesel engine, was examined to identify effective thermal loads on it, during its real operation. Both theoretical tools and experimental set-up were used to achieve feasible results. The two different theoretical approaches used were respectively at steady and unsteady operation. They were set-up to account for the complex thermal resistances network, due to different materials used and for the interaction of heat loads on components, due to their different thermal inertia and the characteristic operation of the valve, modelling both conduction and convection phenomena. Some tests on a engine bench have been carried out to validate theoretical models. An instrumented EGR valve was used, provided with thermocouples mounted on particular locations, inside and outside the valve. A good matching between theoretical and experimental results was found. Critical components were located in terms of reached thermal limits and a basis for improvement proposals was defined to reduce valve failure, due to thermal loads.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
