Abstract: In this paper, the premixed turbulent combustion is experimentally studied from the viewpoint of the second law of Thermodynamics. The low swirl combustion (LSC) concept is employed as the flame stabilisation mechanism in the tests. On the basis of the normalised laminar flame speed (NLFS), two distinguished flame shape regimes are observed; lifted and attached flames. Observations show the significant effect of the flame regime in terms of exergy destruction. The lifted flame that occurs in lower NLFSs considerable demonstrates lower amount of irreversibility production, whereas the attached flame that presents the higher rates of fuel exergy destruction. Besides, the heat transfer from the combustion chamber to the surrounding for the lifted flame condition is 14% more than the attached flame. Analysing the system via the entropy generation approach illuminated the role of temperature distribution in the variations of irreversibility production.

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