COMBUSTION OF METHANE AND ETHANE WITH CO2 REPLACING N-2 AS A DILUENT - MODELING OF COMBINED EFFECTS OF DETAILED CHEMICAL-KINETICS AND THERMAL-PROPERTIES ON THE EARLY STAGES OF COMBUSTION
D. Yossefi et al., COMBUSTION OF METHANE AND ETHANE WITH CO2 REPLACING N-2 AS A DILUENT - MODELING OF COMBINED EFFECTS OF DETAILED CHEMICAL-KINETICS AND THERMAL-PROPERTIES ON THE EARLY STAGES OF COMBUSTION, Fuel, 74(7), 1995, pp. 1061-1071
Simulations of methane combustion are developed for a synthetic atmosp
here system where nitrogen is replaced as diluent with carbon dioxide.
Special attention is given to the role of the detailed chemistry, usi
ng a scheme containing similar to 100 separate reactions. The sensitiv
ity of the results to the major reactions is analysed, and the approac
h to equilibrium is considered. Examination of a set of model problems
shows that where there is a large initial concentration of carbon dio
xide, the chemical effects are very important. The results for constan
t-pressure combustion coincide with conventional expectations, whereas
those for a constant-volume system initiated by isotropic auto-igniti
on are very much counter to intuition. The methods are validated by si
mulating a plug-flow reactor, for which agreement with experiment is g
ood. The typical application of this work is to subsea vehicles and ot
her closed-environment machines, and the recognition of the importance
of chemical effects points to the possibility of chemically modifying
performance.