Investigation of the mechanism for rapid heating of nitrogen and air in gas discharges

Попов, Н. А.

doi:10.1134/1.1409722

Cited by 238 publications

(274 citation statements)

References 18 publications

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“…6 confirms the ultrafast heating mechanism of nanosecond pulsed discharges proposed by Popov [14] . As referred in the introduction, the mechanism declared that during the high voltage pulse, nitrogen molecules will first be excited by electron impact to electronic states such as A 3 Σ, B 3 Π, and C 3 Π.…”

Section: The Time Resolved Emission Spectra Of Npd In Flamesupporting

confidence: 73%

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Dynamic and hydrodynamic response of premixed methane-air flame to nanosecond pulsed discharges

Zhang

Xiong

et al. 2014

AIP Conference Proceedings

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Abstract. Nanosecond pulsed discharges were applied to an experimental study for exploring the temporal response of a premixed methane/air Bunsen flame with two optical diagnostic methods. The microstructure and dynamic response of flame to the discharges was observed by a schlieren system, and the radial velocity of the shock wave was also measured. Time-resolved optical emission spectroscopy offered intermediate species, their evolutionary timescales and temperature in the plasma region. While the ultrafast heating mechanism of NPD was confirmed, the experimental results also provided lots of critical data for understanding the dynamics of non-equilibrium plasma produced by NPD and performing further numerical simulation. In addition, it also indicates that NPD can stir reactant gases and interact with flame by the generated shock wave and vortices while it produces more reactive plasma than LIBS. It makes the technique may be more suited for applications in combustion enhancement and instability control.

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Section: The Time Resolved Emission Spectra Of Npd In Flamesupporting

confidence: 73%

“…[14] is the most popular approach for interpreting electron kinetics in non-equilibrium plasmas induced by NPD. The mechanism is composed of the following two steps: …”

Section: Introductionmentioning

confidence: 99%

Dynamic and hydrodynamic response of premixed methane-air flame to nanosecond pulsed discharges

Zhang

Xiong

et al. 2014

AIP Conference Proceedings

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“…Ignoring this major effect would result in significant overestimation of specific energy loading in the discharge, by up to a factor of approximately 2-3. Finally, rapid heating occurring in pulsed discharges at high specific energy loadings [38][39][40], caused primarily by quenching of excited electronic states of nitrogen [12,38] on the shorter time scale compared with the acoustic time scale, 1/ν quench τ acoust ∼ r/a, where ν quench is the quenching frequency and a is the speed of sound, may result in significant pressure overshoot and compression wave formation [12,40,41], with subsequent pressure reduction to its initial value. It is easy to show that in radial axisymmetric geometry, time-dependent pressure on the discharge centreline can be estimated as…”

Section: Kinetic Modelmentioning

confidence: 99%

Kinetic mechanism of molecular energy transfer and chemical reactions in low-temperature air-fuel plasmas

Adamovich

Lempert

2015

Phil. Trans. R. Soc. A.

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This work describes the kinetic mechanism of coupled molecular energy transfer and chemical reactions in low-temperature air, H 2 –air and hydrocarbon–air plasmas sustained by nanosecond pulse discharges (single-pulse or repetitive pulse burst). The model incorporates electron impact processes, state-specific N 2 vibrational energy transfer, reactions of excited electronic species of N 2 , O 2 , N and O, and ‘conventional’ chemical reactions (Konnov mechanism). Effects of diffusion and conduction heat transfer, energy coupled to the cathode layer and gasdynamic compression/expansion are incorporated as quasi-zero-dimensional corrections. The model is exercised using a combination of freeware (Bolsig+) and commercial software (ChemKin-Pro). The model predictions are validated using time-resolved measurements of temperature and N 2 vibrational level populations in nanosecond pulse discharges in air in plane-to-plane and sphere-to-sphere geometry; temperature and OH number density after nanosecond pulse burst discharges in lean H 2 –air, CH 4 –air and C 2 H 4 –air mixtures; and temperature after the nanosecond pulse discharge burst during plasma-assisted ignition of lean H 2 -mixtures, showing good agreement with the data. The model predictions for OH number density in lean C 3 H 8 –air mixtures differ from the experimental results, over-predicting its absolute value and failing to predict transient OH rise and decay after the discharge burst. The agreement with the data for C 3 H 8 –air is improved considerably if a different conventional hydrocarbon chemistry reaction set (LLNL methane– n -butane flame mechanism) is used. The results of mechanism validation demonstrate its applicability for analysis of plasma chemical oxidation and ignition of low-temperature H 2 –air, CH 4 –air and C 2 H 4 –air mixtures using nanosecond pulse discharges. Kinetic modelling of low-temperature plasma excited propane–air mixtures demonstrates the need for development of a more accurate ‘conventional’ chemistry mechanism.

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“…A phenomenological model of dissipative heating was used for the ns-DBD, meaning that the numerical model of the actuator was based on empirical observations and assumptions. An example of which is the assumption that all energy was deposited in the translational/rotational mode (based on previous work on rapid gas heating by Popov et al 18 ). The heating model was included in the Navier-Stokes equations through a source term, S, as seen in equation 5: 31…”

Section: Applications Of Ns-dbdmentioning

confidence: 99%

Joule heating flow control methods for high-speed flows

Russell

Zare‐Behtash

Kontis

2016

Journal of Electrostatics

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Investigation of the mechanism for rapid heating of nitrogen and air in gas discharges

Cited by 238 publications

References 18 publications

Dynamic and hydrodynamic response of premixed methane-air flame to nanosecond pulsed discharges

Dynamic and hydrodynamic response of premixed methane-air flame to nanosecond pulsed discharges

Kinetic mechanism of molecular energy transfer and chemical reactions in low-temperature air-fuel plasmas

Joule heating flow control methods for high-speed flows

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