Irreversibility production during transient operation of a turbocharged diesel engine
by Evangelos G. Giakoumis, Eleftherios C. Andritsakis
International Journal of Vehicle Design (IJVD), Vol. 45, No. 1/2, 2007

Abstract: A computer model has been developed for studying the first- and second-law balances of a turbocharged diesel engine under transient conditions. Special attention is paid to the identification and quantification of the irreversibilities of all processes and devices after a ramp increase in load. The model includes a detailed analysis of mechanical friction, a separate consideration for the processes in each cylinder during a cycle ('multi-cylinder' model) and a mathematical simulation of the fuel pump. Experimental data taken from a turbocharged diesel engine are used for the evaluation of the model's predictive capabilities. The contribution of combustion, anifolds, aftercooler and turbocharger irreversibility production is analysed using detailed diagrams. It is revealed that transient in-cylinder irreversibilities develop in a different manner compared to the respective steady-state. Combustion has always a dominant contribution but the exhaust manifold irreversibilities cannot be ignored, whereas those attributed to the inlet manifold, turbocharger and aftercooler are always of lesser importance.

Online publication date: Fri, 11-May-2007

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