A numerical investigation of CO2 dilution on the thermochemical characteristics of a swirl stabilized diffusion flame

doi:10.1007/s10483-020-2571-6

摘要/Abstract

摘要： The turbulent combustion flow modeling is performed to study the effects of CO₂ addition to the fuel and oxidizer streams on the thermochemical characteristics of a swirl stabilized diffusion flame. A flamelet approach along with three well-known turbulence models is utilized to model the turbulent combustion flow field. The k-ω shear stress transport (SST) model shows the best agreement with the experimental measurements compared with other models. Therefore, the k-ω SST model is used to study the effects of CO₂ dilution on the flame structure and strength, temperature distribution, and CO concentration. To determine the chemical effects of CO₂ dilution, a fictitious species is replaced with the regular CO₂ in both the fuel stream and the oxidizer stream. The results indicate that the flame temperature decreases when CO₂ is added to either the fuel or the oxidizer stream. The flame length reduction is observed at all levels of CO₂ dilution. The H radical concentration indicating the flame strength decreases, following by the thermochemical effects of CO₂ dilution processes. In comparison with the fictitious species dilution, the chemical effects of CO₂ addition enhance the CO mass fraction. The numerical simulations show that when the dilution level is higher, the rate of the flame length reduction is more significant at low swirl numbers.

关键词: swirl stabilized flame, CO₂ dilution, methane-air chemical effect, turbulent flame structure, steady flamelet model

Abstract: The turbulent combustion flow modeling is performed to study the effects of CO₂ addition to the fuel and oxidizer streams on the thermochemical characteristics of a swirl stabilized diffusion flame. A flamelet approach along with three well-known turbulence models is utilized to model the turbulent combustion flow field. The k-ω shear stress transport (SST) model shows the best agreement with the experimental measurements compared with other models. Therefore, the k-ω SST model is used to study the effects of CO₂ dilution on the flame structure and strength, temperature distribution, and CO concentration. To determine the chemical effects of CO₂ dilution, a fictitious species is replaced with the regular CO₂ in both the fuel stream and the oxidizer stream. The results indicate that the flame temperature decreases when CO₂ is added to either the fuel or the oxidizer stream. The flame length reduction is observed at all levels of CO₂ dilution. The H radical concentration indicating the flame strength decreases, following by the thermochemical effects of CO₂ dilution processes. In comparison with the fictitious species dilution, the chemical effects of CO₂ addition enhance the CO mass fraction. The numerical simulations show that when the dilution level is higher, the rate of the flame length reduction is more significant at low swirl numbers.

Key words: swirl stabilized flame, CO₂ dilution, methane-air chemical effect, turbulent flame structure, steady flamelet model

中图分类号:

S. VAKILIPOUR, Y. TOHIDI, J. AL-ZAILI, R. RIAZI. A numerical investigation of CO₂ dilution on the thermochemical characteristics of a swirl stabilized diffusion flame[J]. Applied Mathematics and Mechanics (English Edition), 2020, 41(2): 327-348.

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A numerical investigation of CO₂ dilution on the thermochemical characteristics of a swirl stabilized diffusion flame

A numerical investigation of CO₂ dilution on the thermochemical characteristics of a swirl stabilized diffusion flame

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