Abstract
In the present paper are presented a set of experimental methodologies that allows for characterizing the main aspects necessary to proper modeling energy flows transfer in turbochargers in both design and off-design conditions. With respect to the compressor side the main off-design issue while boosting to an internal combustion engine is surge. Specific techniques for surge detection at on engine conditions with real engine installation will be described in this paper. Concerning the turbine, the three main variables necessary to model off-design performance are: turbine efficiency at off-design conditions; mechanical efficiency and heat flows within the turbocharger. The methodologies proposed in this paper provide these variables based in a combination of adiabatic and non-adiabatic tests in a gasstand for turbochargers once have been previously determined the thermal conductances of the turbocharger materials. The conclusion of the paper offers an example of the obtained results with respect to turbine efficiency for a turbocharger characterized following proposed methodologies.
KEYWORDS: Turbochargers, turbocharging, experimental characterization, off-design conditions,