Premixed Syngas/Air Combustion in Closed Ducts with Varied Aspect Ratios and Initial Pressures
Syngas is a promising renewable energy carrier with various production source, e.g., gasification of coal and biomass. Syngas combustion can result in a significant reduction of pollutant emissions such as SO x , NO x , particulates, and heavy metals. In this work, experiments were conducted in a closed duct to scrutinize the premixed stoichiometric syngas/air combustion with varied aspect ratios (up to 40) and initial pressures. Flame shape evolution were captured through high-speed photography and pressure dynamics was record by sensors. Four flame speed oscillation regimes were distinguished. The combustion instability was examined, and it indicated the acoustic effect and its interaction with flame, the Rayleigh-Taylor (RT) and the Richtmyer-Meshkov (RM) instability had significant impact on combustion by varying the initial conditions. Besides, the Bychkov’s theory considering gas compression effect was validated by the experimental data. The discrepancy between them was interpreted with a comprehensive view of enlarged laminar burning speed, non-adiabatic sidewall and finite flame front thickness
Year of publication: |
[2022]
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Authors: | Shen, Xiaobo ; Zhang, Zhenwu ; Dou, Zengguo ; Cong, Beihua ; Cong, Beihua ; Liu, Haifeng |
Publisher: |
[S.l.] : SSRN |
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