Soot suppression by nonthermal plasma in coflow jet diffusion flames using a dielectric barrier discharge
TL;DR: In this paper, the effect of nonthermal plasma on diffusion flames in coflow jets has been studied experimentally by adopting a dielectric barrier discharge (DBD) technique.
About: This article is published in Combustion and Flame.The article was published on 2005-06-01. It has received 91 citations till now. The article focuses on the topics: Diffusion flame & Nonthermal plasma.
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TL;DR: A comprehensive overview of the progress and the gap in the knowledge of plasma assisted combustion in applications, chemistry, ignition and flame dynamics, experimental methods, diagnostics, kinetic modeling, and discharge control is provided in this paper.
812Â citations
TL;DR: A comprehensive review of the researches on various aspects of soot formation utilizing counterflow flames is provided in this paper, with focus on the most recent (post-2010) research progress.
276Â citations
TL;DR: In this paper, the authors examined three different types of plasma discharges in their ability to stabilize a lifted jet diffusion flame in coflow, and the optimal placement of the discharge electrodes was investigated, and it was found that there is a close relation between this placement and the emission spectra, suggesting use of the emission spectrum as a possible indicator of fuel/air mixture fraction.
Abstract: The authors examine three different types of plasma discharges in their ability to stabilize a lifted jet diffusion flame in coflow. The three discharges include a single-electrode corona discharge, an asymmetric dielectric-barrier discharge (DBD), and a repetitive ultrashort-pulsed discharge. The degree of nonequilibrium of this pulsed discharge is found to be higher than that for the DBD. Furthermore, this pulsed discharge causes the most significant improvement in the flame stability. The optimal placement of the discharge electrodes is investigated, and it is found that there is a close relation between this placement and the emission spectra, suggesting use of the emission spectra as a possible indicator of fuel/air mixture fraction. The optimal placement is mapped into mixture-fraction space by use of a fully premixed flame experiment of known mixture fraction. The result shows that the mixture fraction, which corresponds to the optimal placement, is much leaner than that of a conventional lifted jet flame
111Â citations
Cites methods from "Soot suppression by nonthermal plas..."
...[16] used a DBD to reduce the concentration of NOX, SOX, and soot produced by combustion....
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01 Jan 2007
TL;DR: In this paper, the effects of electric fields on the reattachment of lifted flames have been investigated experimentally in laminar coflow jets with propane fuel by applying high voltages to the fuel nozzle.
Abstract: The effects of electric fields on the reattachment of lifted flames have been investigated experimentally in laminar coflow jets with propane fuel by applying high voltages to the fuel nozzle. In case of AC, the frequency has also been varied. Results showed that reattachment occurred at higher jet velocity when applying the AC voltages, thus the stabilization limit of attached flames was extended by the AC electric field. Higher voltage and lower frequency of the AC were found to be more effective. On the contrary, the effect of DC was found to be minimal. To understand the early onset of the reattachment with the AC, occurring at higher jet velocity, the influence of AC electric fields on the propagation speed of tribrachial flame edge was investigated during the transient reattachment processes. The propagation speed increased reasonably linearly with the applied AC voltage and decreased inversely to the distance between the flame edge and the nozzle electrode. Consequently, the enhancement in the propagation speed of tribrachial flame edge was correlated well with the electric field intensity, defined as the applied AC voltage divided by the distance.
96Â citations
TL;DR: In this paper, the effect of electric fields on the propagation speed of tribrachial (or triple) flames has been investigated in a coflow jet by observing the transient flame propagation behavior after ignition.
93Â citations
References
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TL;DR: In this paper, a review of applications of corona discharge induced plasmas and unipolar ions is presented, focusing on one of two aspects of the discharge: the ions produced or the energetic electrons producing the plasma.
Abstract: Applications of corona discharge induced plasmas and unipolar ions are reviewed. Corona process applications emphasize one of two aspects of the discharge: the ions produced or the energetic electrons producing the plasma. The ion identities depend on the polarity of the discharge and the characteristics of the gas mixture, specifically on the electron attaching species. The electron energies depend on the gas characteristics and on the method of generating the corona. In general, in an application using ions, the corona induced plasma zone will occupy a small fraction of the total process volume, while a process using the electrons will fill most of the volume with the plasma. Current state-of-the knowledge of ionized environments and the function of corona discharge processes are discussed in detail. >
820Â citations
TL;DR: In this paper, a review of plasma chemical processes occurring in the volume part of electrical nonequilibrium discharges is presented, where the role of energetic electrons as initiators of chemical reactions in a cold background gas is discussed.
Abstract: A review is presented of plasma chemical processes occurring in the volume part of electrical nonequilibrium discharges. The role of energetic electrons as initiators of chemical reactions in a cold background gas is discussed. Different discharge types of (glow, corona, silent, RF, and microwave discharges) are investigated with respect to their suitability for plasma processing. Emphasis is placed on the requirements of initiating and maintaining the discharge and, at the same time, optimizing plasma parameters for the desired chemical process. Using large-scale industrial ozone production as an example, the detailed process of discharge optimization is described. Other applications of volume plasma processing include other plasma chemical syntheses as well as decomposition processes such as flue gas treatment and hazardous waste disposal. The author only deals with plasmas which are not in equilibrium. >
771Â citations
376Â citations
TL;DR: In this article, it is shown that diffusion flame size can be predicted for two different burner geometries (circular and slotted ports) by taking the diffusion coefficient of oxygen at a characteristic flame temperature of 1500 K. The transition between the two regimes occurs when the modified Froude number is approximately one.
288Â citations