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Characterization of the effects of a plasma injector driven by AC dielectric barrier discharge on ethylene-air diffusion flame structure

Characterization of the effects of a plasma injector driven by AC dielectric barrier discharge on... AbstractA dielectric barrier discharge plasma controlled diffusion flame experimental system was built based on the designed coaxial swirling plasma injector. The air plasma was generated within the annulus gap of the injector by alternating current dielectric barrier discharge. The discharge characteristics and power of plasma injector under different actuation intensities and air flowrates were measured. Through the measurement techniques, such as schlieren imaging, broadband chemiluminescence image and CH* chemiluminescence, the effect and mechanism of plasma on ethylene-air normal diffusive jet and flame was explored. The results showed that a large number of filamentary discharge channels are formed in air plasma. The increase of air flowrates weakened the intensity of discharge to a certain extent. The induced jet generated by the plasma can short the laminar length of the ethylene-air jet, accelerate the transition of the flow jet, enhance the turbulence and the mixing of the fuel and the oxidizer. The higher the actuation intensity, the shorter distance of the cold jet transition zone, the higher the jet turbulence. Depending on the aerodynamic and kinetic effects, plasma can improve the stability of ethylene-air diffusive flame and reduce the lift height between the flame root and injector. The plasma can also expand the flammability limit of ethylene-air flame and make the flame ignited under some conditions that could not be. In addition, the CH* chemiluminescence shows that, in a certain range of discharge voltage, the heat release distribution can be changed on both sides of the flame, and its representative length are generally reduced as the voltage rises. On the contrary, the overtop voltage could lead to a decrease of flame heat release. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Open Physics de Gruyter

Characterization of the effects of a plasma injector driven by AC dielectric barrier discharge on ethylene-air diffusion flame structure

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Publisher
de Gruyter
Copyright
© 2020 Z. Zheng et al., published by De Gruyter
ISSN
2391-5471
eISSN
2391-5471
DOI
10.1515/phys-2020-0008
Publisher site
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Abstract

AbstractA dielectric barrier discharge plasma controlled diffusion flame experimental system was built based on the designed coaxial swirling plasma injector. The air plasma was generated within the annulus gap of the injector by alternating current dielectric barrier discharge. The discharge characteristics and power of plasma injector under different actuation intensities and air flowrates were measured. Through the measurement techniques, such as schlieren imaging, broadband chemiluminescence image and CH* chemiluminescence, the effect and mechanism of plasma on ethylene-air normal diffusive jet and flame was explored. The results showed that a large number of filamentary discharge channels are formed in air plasma. The increase of air flowrates weakened the intensity of discharge to a certain extent. The induced jet generated by the plasma can short the laminar length of the ethylene-air jet, accelerate the transition of the flow jet, enhance the turbulence and the mixing of the fuel and the oxidizer. The higher the actuation intensity, the shorter distance of the cold jet transition zone, the higher the jet turbulence. Depending on the aerodynamic and kinetic effects, plasma can improve the stability of ethylene-air diffusive flame and reduce the lift height between the flame root and injector. The plasma can also expand the flammability limit of ethylene-air flame and make the flame ignited under some conditions that could not be. In addition, the CH* chemiluminescence shows that, in a certain range of discharge voltage, the heat release distribution can be changed on both sides of the flame, and its representative length are generally reduced as the voltage rises. On the contrary, the overtop voltage could lead to a decrease of flame heat release.

Journal

Open Physics – de Gruyter

Published: Mar 31, 2020

References

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  • Plasma-assisted ignition and combustion: nanosecond discharges and development of kinetic mechanisms
  • Plasma-assisted ignition and combustion
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  • Cavity ignition and flame- holding of ethylene–air and hydrogen–air flows by a repetitively pulsed nanosecond discharge
  • Transcritical oxygen/transcritical or supercritical methane combustion
  • Ignition of hydrogen–air mixtures using pulsed nanosecond dielectric barrier plasma discharges in plane-to-plane geometry
  • Advantages of full-Flow staged combustion cycle engine system, 33rd Joint Propulsion Conference and Exhibit
  • Experimental study on dynamics of a confined low swirl partially premixed methane- hydrogen-air flame
  • Cavity ignition and flame- holding of ethylene–air and hydrogen–air flows by a repetitively pulsed nanosecond discharge
  • Effect of nanosecond repetitively pulsed discharges on the dynamics of a swirl- stabilized lean premixed flame
  • Experimental study on the diffusive flame stabilization mechanism of plasma injector driven by AC dielectric barrier discharge
  • Flame propagation enhancement by plasma excitation of oxygen
  • Liquid oxygen/liquid methane rocketenginedevelopment
  • Transcritical oxygen/transcritical or supercritical methane combustion
  • Plasma assisted combustion: dynamics and chemistry
  • The role of non-thermal transient plasma for enhanced flame ignition in C2H4– air
  • NASA’s Exploration Systems Architecture Study
  • Electric effects on the pre-mixing process in DBD assisted combustions
  • NASA’s Exploration Systems Architecture Study
  • Quasi-steady and unsteady actuation by surface non-thermal plasma discharge for control of a turbulent round air jet
  • Supercritical LOX/methane combustion of a shear coaxial injector
  • Investigation of NO production and flame structure in plasma enhanced premixed combustion
  • Flame propagation enhancement by plasma excitation of oxygen
  • Stabilization of a turbulent premixed flame using a nanosecond repetitively pulsed plasma
  • Large-eddy simulation of flame- turbulence interactions in a shear coaxial injector
  • Experimental investigation on convective heat transfer of ferrofluids inside a pipe under various magnet orientations
  • Improvement of lean flame stability of inverse methane/air diffusion flame by using coaxial dielectric plasma discharge actuators
  • Effects of gravity and variable thermal properties on nanofluid convective heat transfer using connected and unconnectedwalls
  • Mixing in coaxial jets
  • Experimental investigation of CH4/Air inverse diffusion flame stabilization by nonequilib-rium plasma