The structure and extinction states of two interacting stretched premixed flames of unequal mixture concentrations and distinct fuel, oxidizer and thermal diffusivities are analyzed. Results show that the extinction behavior depends critically on the effective Lewis numbers of the mixtures in that flames with large Lewis numbers interact weakly such that extinction mainly depends on the concentration of the stronger flame, while flames with small Lewis numbers interact strongly such that extinction depends on the concentrations of both flames. Theoretical predictions identify the various extinction modes and satisfactorily explain the experimental results on the extinction boundaries of lean and rich methane/air and butane/air flames.
ASJC Scopus subject areas
- Chemical Engineering(all)
- Fuel Technology
- Energy Engineering and Power Technology
- Mechanical Engineering
- Physical and Theoretical Chemistry
- Fluid Flow and Transfer Processes