Abstract
Low temperature combustion (LTC) is a new mode for efficient and clean combustion in engines, and the process is mainly controlled by chemical reaction kinetics of fuel. In this paper, the numerical model of exergy analysis for LTC engine was established. The temperature, pressure and species concentration were obtained by using the homogeneous charge compression ignition (HCCI) engine model of Chemkin-Pro software with the simplified mechanism of toluene reference fuel (TRF). The exergy items were further calculated to explore the effect of different intake conditions on exergy destruction in LTC process. It was found that the irreversibility related to the combustion proceeding mainly happened in low temperature and high temperature reaction zones. With the increase of exhaust gas recirculation (EGR) rate, the proportion of working exergy increases but the irreversibility destruction of combustion decreases. Besides, N2 component concentration in EGR gas has the greatest influence on the distribution of exergy.
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