Control of a Turbulent Non-Premixed Flame by Plasma Actuators

A computational study of methane–air combustion with three configurations of plasma actuators placed around the periphery of a coaxial jet combustor is investigated. Plasma actuators are used to impose a local body force near the combustor wall. Three different approximated plasma forces are tested...

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Bibliographic Details
Published in:Journal of thermophysics and heat transfer 2018-01, Vol.32 (1), p.111-117
Main Authors: Wang, Chin-Cheng, Tsao, Hsien-Wen
Format: Article
Language:English
Subjects:
Actuation
Aerodynamics
Aerospace sciences
Air flow
Combustion chambers
Configurations
Counterflow
Noise control
Nonpremixed flames
Plasma
Plasma actuators
Turbulence
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Summary:A computational study of methane–air combustion with three configurations of plasma actuators placed around the periphery of a coaxial jet combustor is investigated. Plasma actuators are used to impose a local body force near the combustor wall. Three different approximated plasma forces are tested for each configuration. For the baseline case without plasma actuation, results are validated with published numerical and experimental data. At large plasma force, the flame shape becomes narrow for the configuration of the coflow case. For the rest of configurations, the flame is extinguished due to fuel-lean mixtures at large plasma force. For the configuration of the counterflow case, the size of the outer recirculation zone has been increased by increasing the plasma force. However, the large outer recirculation zone may block the airflow path and result in flame extinguishment. For the configuration of the counterclockwise coflow case, the flame shape becomes wider until the plasma force of 200  mN/m. Thus, this study predicts different flame structures by using different plasma configurations.
ISSN:0887-8722
1533-6808
DOI:10.2514/1.T5149