Analysis of entropy generation distribution in micro-combustors with baffles

This study presents the analysis of entropy generation distribution in H2/air premixed flame in micro-combustors with baffles. The numerical simulation of combustion is performed with the help of Ansys Fluent code. The entropy generation rates are derived from entropy transport equation and calculated based on the numerical results. The entropy generation caused by various irreversible processes such as chemical reaction, thermal conduction and mass diffusion are studied in micro-combustors with baffles. The effects of the height of the baffles, H2/air mass flow rate and equivalence ratio are investigated. It is found that a higher baffle will lead to more entropy generation and relatively larger destruction of available energy. The exergy efficiency decreases significantly when the H2/air mass flow rate is increased. The lean and rich H2/air mixture shows an obvious lower entropy generation rate and higher exergy efficiency than the stoichiometric mixture.