Theoretical and experimental investigation of the matching between an I.C.E. and a turbocharger

The authors present a method for turbocharged I.C.E. analysis, based upon an unsteady non-dimensional flow-model, whose accuracy level has been improved by means of experimental investigations. Experimental activities allowed a higher prediction level to be reached for both engine cycles and turbocharger operation. The results are also compared with those of an experimental methodology recently proposed by the authors, based upon one-dimensional unsteady flow models and fast pressure data acquisition. The method is mainly utilized, in this paper, as to compare the effects of two different turbochargers on engine performance and turbomachinery operating conditions. The engine and turbocharger matching is considered under both steady and transient conditions.