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Communication Dans Un Congrès Année : 2023

Characterization of anisole sooting properties in a laminar coflow diffusion lame

Résumé

Accumulation of greenhouse gaseous and particulate matter on the atmosphere has resulted on the search for clean energy sources to replace conventional hydrocarbon fuels. Lately, oxygenated fuels such as anisole have gained increased attention, since their addition to gasoline increases its octane number and improves the engine performance. As there are limited studies concerning soot production of anisole under enriched oxidizing environments, this study focuses on the detailed characterization of soot propensity and maturity of a well-controlled laminar coflow diffusion flame fueled with anisole and using methane as the carrier gas. Four flames established in flow conditions below the smoke point are studied. The oxidizer composition ranged from a molar fraction of oxygen on the oxidizer (oxygen index, OI) of 21% (ambient air) to 35% (doped with pure oxygen), while keeping constant the total volumetric flow rate of oxidizer. Multi-wavelength line-of-sight attenuation experiments were performed from visible to infrared wavelengths, and the measurements of the extinction coefficient and flame temperature were used to retrieve two dimensional fields of soot temperature, volume fraction, radiative intensity and degree of maturity. In general, the sooting propensity and radiative behavior of the anisole flames follows a similar tendency than typical hydrocarbon fuels when increasing the OI. However, soot volume fraction is more concentrated at the flame centerline, specially for ambient air conditions of the oxidizer. As the OI increases, temperature increases, promoting formation and oxidation processes, specially at the locations near the maximum soot volume fraction. In general, the maturity of soot particles increases as the OI increases (more graphitic particles), and from the centerline to the flame wings, for the different conditions studied. A statistical analysis of the different fields showed that, overall, the soot particles produced in the anisole flame are more mature for higher temperature environments at increased OI conditions. These results constitute a rich database for validating detailed soot production models of complex fuels, and to gain further insights on soot production of these fuels under different oxidizing environments.
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Dates et versions

hal-04063911 , version 1 (10-04-2023)

Identifiants

  • HAL Id : hal-04063911 , version 1

Citer

C Barrera, V Castro, F Escudero, J J Cruz, I Verdugo, et al.. Characterization of anisole sooting properties in a laminar coflow diffusion lame. Mediterranean Combustion Symposium, Jan 2023, Louxor, Egypt. ⟨hal-04063911⟩
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