Electron temperatures in flame gases: experiment and theory

Bradley, D.; Ibrahim, Said M.A.

doi:10.1016/0010-2180(75)90144-3

Cited by 5 publications

(2 citation statements)

References 8 publications

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“…4). Authors [23] note that the maximum of the T e is displaced with respect to maximum of T h towards the region of intensive chemiluminiscence of OH radicals. Nevertheless, these authors worked below atmospheric pressure (about 5000 Pa).…”

Section: Resultsmentioning

confidence: 97%

Electron Temperature Measurement in a Premixed Flat Flame Using the Double Probe Method

Wild

Kudrna

Tichý

et al. 2012

Contrib. Plasma Phys.

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Key words Double probe method, electron temperature, atmospheric premixed flame, flat flame.The electron temperatures Te were measured using a double probe in a premixed methane flame produced by a calibration burner according to Hartung et al. The experiment was performed at atmospheric pressure. In contrast to other authors, we have managed to find typical nonlinearities corresponding to the retarding electron current region and to calculate electron temperatures using a suitable fit on the basis of the measured characteristics. A Pt-Rh thermocouple was used to measure temperatures T h corresponding to "heavy" species.Our results indicate that the flame plasma can be considered to be weakly non-isothermic -Te = (2400 -4000) K, T h = (1400 -1600) K. On the basis of measurement of the saturated ion current, the number density of the charged particles was estimated at (0.3 -3.8)·10 17 m −3 . The trends in Te and T h in dependence on the positions of the probes and thermocouple in the flame differ substantially; this fact has not yet been explained.

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Section: Resultsmentioning

confidence: 97%

Electron Temperature Measurement in a Premixed Flat Flame Using the Double Probe Method

Wild

Kudrna

Tichý

et al. 2012

Contrib. Plasma Phys.

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“…Lately, as an alternative method in supersonic combustion, plasma-assisted combustion (PAC) has shown remarkable capabilities in improving fuel/air mixing, ignition and flame stabilization. The enhancement of supersonic combustion by PAC can be classified as kinetical [24][25][26][27][28][29][30], thermal [31][32][33][34][35], and plasma-induced aerodynamic effects [36][37][38]. Nonequilibrium plasmas, such as corona microwave, lowpressure glow, and nanosecond high-voltage discharges improve combustion by adding active radicals leading to the modification of chemical reaction pathways and therefore combustion times are shortened [27].…”

Section: Introductionmentioning

confidence: 99%

Simulation of Plasma Assisted Supersonic Combustion over a Flat Wall

Gutierrez¹,

Álvarez²

2022

MMEP

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This work presents a simplified methodology to couple the physics of a nanosecond pulsed discharge to the process of supersonic combustion in a flat wall combustor configuration. Plasma and supersonic combustion are separately simulated and then coupled by seeding plasma-generated radicals on the combustion domain. The plasma model is built assuming spatial uniformity and considering only the kinetic effects of the nanosecond pulsed discharge. Therefore, a zero-dimensional kinetic scheme accounting for the generation of plasma species is utilized. For the combustion model, the complete set of Favre-averaged compressible Navier Stokes equations along with finite rate chemistry is solved through a control-volume based technique via the commercial software Ansys Fluent. The computational results are compared against experimental studies showing that the proposed methodology can capture the main kinetic effects of the nanosecond pulsed discharge on supersonic combustion. OH concentration contours reveal the presence of an enhanced flame when the plasma is applied following the trends from experimental OH PLIF images. In addition, time evolving temperature and OH concentration contours show that the ignition delay time is reduced with the application of the discharge.

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Attachment of flame chemielectrons to inert, fine particles

Bradley

Jamel

1984

Combustion and Flame

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Electron temperatures in flame gases: experiment and theory

Cited by 5 publications

References 8 publications

Electron Temperature Measurement in a Premixed Flat Flame Using the Double Probe Method

Electron Temperature Measurement in a Premixed Flat Flame Using the Double Probe Method

Simulation of Plasma Assisted Supersonic Combustion over a Flat Wall

Attachment of flame chemielectrons to inert, fine particles

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