The Influence Of Elevated Pressures On Methane Combustion In N2 And Co2 Dilutions

Abstract

This work investigates the effect of CO2 dilution level and pressure on oxy-methane combustion. Primarily, the most influenced species due to CO2 dilution, dilution change from N2 to CO2 and effect of CO2 diluent as a third body reactions are investigated by using CHEMKIN-Pro and the Aramco 2.0 mechanism. Three useful parameters Φ, χ and Ω are defined to see these influences. Also, the nature of prominent CO producing and consuming reactions are investigated in detail with respect to dilution level and pressure. The species HCO and CO are identified as the prominently produced species due to CO2 dilution and prominently consumed species due to pressure rise. Also, it is observed that the CH4 consumption is faster compared O2 consumption in CO2 diluted combustion. Further, the rate of CH4 and O2 consumption is much slower in high CO2 diluted combustion, however they will be accelerated with an increase in pressure. Also, the CO2 dilution delays the radical production and the peak mole fraction of radicals. The reaction CO + OH ⇔ CO2 + H is a prominent CO consuming reaction at 1 atm. and sixty percent CO2 dilution and it becomes a CO producing reaction with the increase in CO2 dilution. However, the nature of this reaction reverts back as the two prominent CO consuming reactions as the pressure increases. Also, the reaction HCO+M ⇔ H+CO+M is a prominent CO producing reaction at 1 atm. and sixty percent of CO2 dilution and it loses its CO productivity by increasing CO2 dilution. However, the nature of this reaction reverts back drastically as the pressure increases.

Publication Date

1-1-2017

Publication Title

53rd AIAA/SAE/ASEE Joint Propulsion Conference, 2017

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.2514/6.2017-4851

Socpus ID

85088755469 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85088755469

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