Abstract

AGUDELO, Andrés; AGUDELO, John  and  BENJUMEA, Pedro. Exergy diagnosis of the combustion process in a Diesel engine. Rev.fac.ing.univ. Antioquia [online]. 2008, n.45, pp.41-53. ISSN 0120-6230.

In this work a singlezone and twospecies exergy diagnosis model is developed and applied for characterizing the operation of a diesel engine from a secondlaw standpoint. The model allows to study the incylinder process during the closedvalve period, and to determine how the exergy is distributed and what is the exergy potential of the losses. Experiments were carried out in a test bed equipped with an automotive, direct injection, turbocharged diesel engine operating at several loads. Combustion diagnosis was made from instantaneous incylinder pressure signal and the main operation parameters of the engine were measured in order to guarantee steady state. Irreversibilities and exergy distribution throughout the process were determined. It was found that combustion is the main source of irreversibilities. Results show that exergy destruction decreases as load increases, which mainly led to an increase in the exergy of exhaust gases. Additionally, the cogeneration potential of the engine was identified, exhibiting significant differences between first and secondlaw results.

Keywords : Exergy analysis; combustion diagnosis; diesel engines.

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