Stabilization of liquid hydrocarbon fuel combustion by using a programmable microwave discharge in a subsonic airflow

Kopyl, P. V.; Surkont, O. S.; Шибков, В.М.; Shibkova, L.V.

doi:10.1134/s1063780x12050054

Cited by 28 publications

(3 citation statements)

References 23 publications

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“…Nevertheless, plasma torches continue to be used for scramjet research due to their convenience and high reliability [23]. In the early 2000s, the number of publications on PAC grew significantly due to increased interest in employing the MHD technique and plasmas for flow control and combustion improvement in high-speed flow employing RF discharges [52][53][54][55], microwaves [56][57][58], direct current discharges [59,60], nanosecond discharges [14,61,62], and other types [63][64][65][66]. Since that time, the main expected benefit of using plasma was the highly non-equilibrium chemical kinetics [4,5], which in turn helps reduce the plasma power required for fuel-oxidizer mixture ignition.…”

Section: Early Effortsmentioning

confidence: 99%

Electrically Driven Supersonic Combustion

Leonov

2018

Energies

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This manuscript reviews published works related to plasma assistance in supersonic combustion; focusing on mixing enhancement, ignition and flameholding. A special attention is paid for studies, which the author participated in person. The Introduction discusses general trends in plasma-assisted combustion and, specifically, work involving supersonic conditions. In Section 2, the emphasis is placed on different approaches to plasma application for fuel ignition and flame stabilization. Several schemes of plasma-based actuators for supersonic combustion have been tested for flameholding purposes at flow conditions where self-ignition of the fuel/air mixture is not realizable due to low air temperatures. Comparing schemes indicates an obvious benefit of plasma generation in-situ, in the mixing layer of air and fuel. In Section 3, the problem of mixing enhancement using a plasma-based technique is considered. The mechanisms of interaction are discussed from the viewpoint of triggering gasdynamic instabilities promoting the kinematic stretching of the fuel-air interface. Section 4 is related to the description of transitional processes and combustion instabilities observed in plasma-assisted high-speed combustion. The dynamics of ignition and flame extinction are explored. It is shown that the characteristic time for reignition can be as short as 10 ms. Two types of flame instability were described which are related to the evolution of a separation zone and thermoacoustic oscillations, with characteristic times 10 ms and 1 ms correspondingly.

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Section: Early Effortsmentioning

confidence: 99%

Electrically Driven Supersonic Combustion

Leonov

2018

Energies

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“…A main reason for that is connected with a low fuel residence time in a supersonic combustor, which is significantly lower compared with the ignition delay time for the standard spark ignition. Advanced more-efficient and less pollutant ignition concepts, which include laser [2][3][4][5], microwave [6][7][8][9], nanosecond pulsed discharge ignition [10][11][12][13] and a combination of laser and microwave discharges [14] are intensively developed and researched.…”

Section: Introductionmentioning

confidence: 99%

Plasma defocusing in dual-pulse laser ignition

Tropina¹,

Pokharel²,

New-Tolley³

et al. 2021

J. Phys. D: Appl. Phys.

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The paper presents simulation results of hydrogen-air mixture ignition by an ultraviolet followed by a near-infrared laser pulse. We used the three-temperature plasma model in a combination with the beam propagation method. Effect of plasma defocusing on the ignition kernel development is reported. It is shown that the plasma generated by the pre-ionizing pulse affects the position of the focal region of the second heating pulse with resulting changes in the distribution of the laser energy absorption, electron and radical production and ignition kernel dynamics. For the case with the defocusing effect we observed a shift of the peaks of translational and vibrational temperatures towards the direction of the laser pulse and two peaks on the axial profile of the electron temperature, reflecting local changes both in Joule heating and electron energy losses.

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“…At present, discharge applications are being intensely developed in various fields of science and technology. Gas discharges and plasma torches are widely used in systems for the plasma maintenance of combustion [1,[24][25][26][27][28][29][30][31][32][33][34], for plasma modification of surfaces (first of all, low-melting dielectric surfaces) [1,5,35], in medicine and biology [1,9,36], and in other technologies based the generation of chemically active particles [37][38][39][40].…”

Section: Introductionmentioning

confidence: 99%

Simulation of nonstationary phenomena in atmospheric-pressure glow discharge

et al. 2016

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Nonstationary processes in atmospheric-pressure glow discharge manifest themselves in spontaneous transitions from the normal glow discharge into a spark. In the experiments, both so-called completed transitions in which a highly conductive constricted channel arises and incomplete transitions accompanied by the formation of a diffuse channel are observed. A model of the positive column of a discharge in air is elaborated that allows one to interpret specific features of the discharge both in the stationary stage and during its transition into a spark and makes it possible to calculate the characteristic oscillatory current waveforms for completed transitions into a spark and aperiodic ones for incomplete transitions. The calculated parameters of the positive column in the glow discharge mode agree well with experiment. Data on the densities of the most abundant species generated in the discharge (such as atomic oxygen, metastable nitrogen molecules, ozone, nitrogen oxides, and negative oxygen ions) are presented.

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Stabilization of liquid hydrocarbon fuel combustion by using a programmable microwave discharge in a subsonic airflow

Cited by 28 publications

References 23 publications

Electrically Driven Supersonic Combustion

Electrically Driven Supersonic Combustion

Plasma defocusing in dual-pulse laser ignition

Simulation of nonstationary phenomena in atmospheric-pressure glow discharge

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