Non-premixed axisymmetric flames driven by ion currents

Tinajero, Jesse Alexander; Dunn‐Rankin, Derek

doi:10.1016/j.combustflame.2018.10.036

Cited by 10 publications

(7 citation statements)

References 53 publications

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“…This led Felix to consider how electric fields might be used to simulate microgravity conditions in 1g, how electric fields could be used for extinguishing flames in microgravity, how to create an all-electric burner for combustion without buoyancy without any moving parts and, finally, the detailed evaluation of the effects of electric fields on microgravity flames. These last studies continued long after Felix's death (Chien et al 2019;Tinajero & Dunn-Rankin 2019).…”

Section: Electrical Aspects Of Combustionmentioning

confidence: 96%

Felix Jiri Weinberg. 2 April 1928—5 December 2012

Dunn‐Rankin

2021

Biogr. Mems Fell. R. Soc.

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Felix Weinberg's teenage years coincided with World War II. He spent much of the war in Nazi concentration camps, starting with Terezin in December 1942, followed by Auschwitz in December 1943, and finally Buchenwald, from which he was liberated on 11 April 1945. He joined Imperial College, London as a research assistant in 1951 and completed his PhD by 1954. He was appointed to a personal chair as professor of combustion physics in 1967, and he stayed at Imperial for his entire career. Weinberg was distinguished for his optical and electrical studies of flames and his pioneering development of innovative combustion methods. He invented a family of powerful optical tools in combustion, using both broad spectrum and laser light sources. His work on electrical diagnostics led to applications of electric fields to control combustion and to improved understanding of ionization and soot formation. He developed novel combustion devices that incorporated distinctive heat exchangers, thereby permitting the ignition and burning of very low calorific fuel–air mixtures. All of these works had a propelling influence on the global evolution of environmentally benign combustion furnaces. His wide-ranging service to academia, industry and scientific societies included visiting scholar appointments at universities around the world, consultancies for petroleum, chemical, aerospace and defence organizations, and active membership on committees and boards of governance for many scientific and professional bodies. He was author, co-author or editor of four books and well over 200 papers in the scientific literature.

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Section: Electrical Aspects Of Combustionmentioning

confidence: 96%

Felix Jiri Weinberg. 2 April 1928—5 December 2012

Dunn‐Rankin

2021

Biogr. Mems Fell. R. Soc.

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“…Fire 2022, 5,196 From the above equation, we can know that the electrostatic gradient between the poles is greater than the electrostatic gradient above the poles, then the pressure gradient between the poles is smaller as shown in Figure 8a, the surrounding gas at a higher pressure will flow to this part of the region, so the paraelectric effect. From Figure 8b it can be seen that the charged particles move to the part of high electric field strength, forming a high-speed gas flow.…”

Section: The Electric Field Acts On the Flame To Produce Ionic Windmentioning

confidence: 99%

“…A flame is a weakly ionized plasma, in the role of the applied electric field its internal contains a large number of charged particles that will produce directional movement, and the formation of ionic wind, affecting the shape, stability, products, and other combustion characteristics of the flame [1][2][3][4][5]. The U.S. Defense Advanced Planning Agency (DARPA) has funded Harvard University's White Edge Research Group to carry out research on electric field fire extinguishing technology [6], the results of which show that electric field fire extinguishing technology in limited space for small and medium-sized flame extinguishing effect is good but cannot be applied to and open areas of large firefighting work.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Ethanol Air Diffusion Flame Quenching under Transverse AC Electric Field

Zhao

Liu

Zhao

et al. 2022

Fire

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The electric field fire extinguishing technology is an efficient, clean, and new fire extinguishing technology that can be operated at a long distance. In order to study the synergistic mechanism of “electric-flow-heat” in the process of transverse AC electric field fire extinguishing, the ionic wind formed by the influence of electric field on each charged particle during the burning process of ethanol–air diffusion flame is simulated by the non-premixed combustion model, and the experimental phenomenon of flame quenching in the transverse AC electric field is reproduced by means of numerical simulation. The accuracy of the numerical model was verified by comparing the temperature and flow velocity in the region obtained from the simulation with the data measured in the experiment. According to both simulated and experimental phenomena, we present a hypothesis of how the flame is quenched under the influence of an electric field. The next research directions are: (1) improving the accuracy of numerical simulation by building fine models; (2) studying the dynamic mechanism of real flames by particle image velocimetry technology.

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“…Furthermore, plasma actuators also produce strong electric fields; they introduce significant electro-hydrodynamic momentum sources which affect the electrically charged flow (ion wind) resulting from both combustion and plasma ionization reactions. Recently, several experimental investigations were conducted to evaluate the impact of an external electric field into the combustion region on non-premixed methane-air diffusive flames by means of an ion current [12][13][14][15]. Based on the experimental observation that chemi-ions modify flame behavior in the presence of an applied electric field, Lopez-Camara et al [16] performed a numerical investigation on the potential relationship between peak location and magnitude of ions and excited species.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Effects of Plasma Discharges on Methane Decomposition for Combustion Enhancement of a Lean Flame

et al. 2020

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The present work focuses on the impact of dielectric barrier discharge (DBD) plasma actuators (PAs) on non-premixed lifted flame stabilization in a methane CH4-air Bunsen burner. Two coaxial DBD-PA configurations are considered. They are composed of a copper corona, installed on the outer surface of a quartz tube and powered with a high voltage sinusoidal signal, and a grounded needle installed along the burner axis. The two configurations differ in the standoff distance value, which indicates the positioning of the high frequency/high voltage (HV) electrode’s upper edge with respect to the needle tip. Experimental results highlight that flame reattachment is obtained at a lower dissipated power when using a negative standoff distance (i.e., placing the needle upstream with respect to the corona). At 11 kV peak-to-peak voltage and 20 kHz frequency, plasma actuation allowed for reattaching the flame with a very low dissipated power (of about 0.05 W). Numerical simulations of the electrostatic field confirmed that this negative standoff configuration has a beneficial effect on the momentum sources, which oppose the flow and show that the highest electric field extends into the inner quartz tube, as confirmed by experimental visualization close to the needle tip. The modeling predicted an increase in the gas temperature of about 21.8 °C and a slight modification of the fuel composition at the burner exit. This impacts the flame speed with a 10% increase close to the stoichiometric conditions with respect to the clean configuration.

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Non-premixed axisymmetric flames driven by ion currents

Cited by 10 publications

References 53 publications

Felix Jiri Weinberg. 2 April 1928—5 December 2012

Felix Jiri Weinberg. 2 April 1928—5 December 2012

Numerical Simulation of Ethanol Air Diffusion Flame Quenching under Transverse AC Electric Field

Investigation of the Effects of Plasma Discharges on Methane Decomposition for Combustion Enhancement of a Lean Flame

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