Akademik Veri Yönetim Sistemi
JOURNAL OF POLYTECHNIC-POLITEKNIK DERGISI, cilt.8, sa.2, ss.161-172, 2005 (ESCI)
This study considers the numerical simulation of combustion of propane with air including 21% oxygen and 79% nitrogen, in a burner and the numerical solution of local entropy generation rate due to high temperature and velocity gradients in the combustion chamber. The effects of the equivalence ratio (phi) and the heat transfer rate ((Q) over dot) to the combustion chamber on the combustion and entropy generation rate are investigated for the different phi's (from 0,5 to 1.0) and (Q) over dot's (from 5 to 10 kW). The numerical calculation of the combustion is performed for all cases by using the Fluent CFD code. Furthermore, a computer program has been developed to numerically calculate the volumetric entropy generation rate distributions and the other thermodynamic parameters by using the results of the calculations performed with the FLUENT code. The maximum values of reaction rates decreased with the increase of phi. The calculations bring out that in the case of phi<1, the complete combustion occurs and that the combustion in the case of phi=1 is very close to the complete combustion state. Although the levels of the entropy generation rate profiles rise up with the increase of (Q) over dot, they decrease exponentially with the increase of phi. It is obtained from the numerical results that the maximum entropies are generated in the case of phi=0,5 and that their values vary in the range of 3,7-7,6 W/K depending on (Q) over dot.