Fast gas heating and radial distribution of active species in nanosecond capillary discharge in pure nitrogen and N<sub>2</sub>:O<sub>2</sub>mixtures

Lepikhin, N D; Попов, Н. А.; Starikovskaia, Svetlana

doi:10.1088/1361-6595/aab74e

Cited by 39 publications

(91 citation statements)

References 66 publications

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“…While replicating the same configuration in Kr partially mitigates this uncertainty, it is believed that the difference in radial profiles of the N and Kr atoms within the capillary will constitute a certain amount of error. In particular, a previous study in the same discharge noted a 'U' shape distribution of N 2 �C Π u 3 , v = 0� molecules over the capillary cross-section during the discharge pulse [20]. The consequent N-atom production is expected to be strongly influenced by and replicate this initial distribution.…”

Section: Talif Signal Versus Laser Intensitymentioning

confidence: 86%

“…Another source of ground state N-atoms is therefore derived from the collisional de-excitation of these N( 2 D) atoms. At gas temperatures between T = 1700 -2000 K typical of such a capillary discharge [20], the rate constant of quenching of N( 2 D) atoms N( 2 D) + N2 → N( 4 S) + N2 is equal to k5 = (3 -4) • 10 -12 cm 3 /s [31]. A typical quenching time of reaction ( 5) at P = 27 mbar is equal to 400 -500 ns.…”

Section: Time Evolution Of N-atom Densitymentioning

confidence: 99%

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TALIF measurements of atomic nitrogen in the afterglow of a nanosecond capillary discharge

Chng

Lepikhin

Orel

et al. 2020

Plasma Sources Sci. Technol.

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The atomic nitrogen (N) density in a nanosecond pulse capillary discharge is measured using two-photon laser induced fluorescence (TALIF). The capillary discharge is favored for its unique combination of both large reduced fields (E/N) and high specific deposited energies. Under such conditions, we find that a pure nitrogen (N2) capillary discharge at a pressure of 27 mbar and temperature of about 300 K, produces a peak N-atom density of 1.29 • 10 17 cm -3 , corresponding to an extremely high dissociation degree of about 10%. The time evolution of the N-atom density is tracked from a few hundred ns after discharge initiation, up to several ms when the concentration of N-atoms falls below the detection limit. The temporal evolution curve exhibits a trapezoidal-like shape, characterized by an initial rise in the N-atom density up to a few µs, followed by a relatively flat and constant profile until about 1 ms, and finally terminating with a drop to near detection limits at about 10 ms. The high electron densities (≈10 15 cm -3 ) and efficient production of electronically excited states associated with this type of discharge is found to have a profound effect on the consequent kinetics. A process of stepwise dissociation through electron impact of the N 2 (A Σ u + 3

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Section: Talif Signal Versus Laser Intensitymentioning

confidence: 86%

Section: Time Evolution Of N-atom Densitymentioning

confidence: 99%

TALIF measurements of atomic nitrogen in the afterglow of a nanosecond capillary discharge

Chng

Lepikhin

Orel

et al. 2020

Plasma Sources Sci. Technol.

Self Cite

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“…The HV signal was transmitted to the HV electrode through a 30-m long coaxial RG213 cable. The waveforms of the HV pulses and the deposited energy were measured by a custom-made calibrated back current shunt (BCS) [7] mounted in the shield of the cable and connected to a WaveRunner 4Xi-A 600-MHz oscilloscope (LeCroy).…”

Section: Experimental Setup and Methodsmentioning

confidence: 99%

Effect of non-equilibrium plasma on decreasing the detonation cell size

Cherif

Shcherbanev

Starikovskaia

et al. 2020

Combustion and Flame

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“…The BCS was connected to a LeCroy WaveRunner 4Xi-A 600-MHz oscilloscope. The details of the BCS technique have been described elsewhere [14].…”

Section: Methodsmentioning

confidence: 99%

Influence of moderate pressure nanosecond discharge on the structure of detonation wave

Cherif

Claverie

Vidal

et al. 2020

AIAA Scitech 2020 Forum

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The effect of a volumetric nanosecond discharge on detonation cell size was demonstrated experimentally in a detonation tube test rig. The experiments were performed in CH 4 :O 2 :Ar=1:2:2 mixture, at initial pressure 180 mbar and ambient temperature. The detonation wave was initiated in a 3.6-m long, 50 × 50-mm 2 square cross section tube, and entered the measuring section where the electrode system was installed to produce a double-pulse discharge ahead of the detonation front. The triggering of the discharge was synchronized with the arrival of the detonation front to the diagnostic chamber. The plasma was generated by two consecutive pulses of −50 and −32 kV amplitude on the high-voltage electrode and 25 ns pulse duration. It was shown that the plasma fills the entire interelectrode space. The analysis of the detonation cell size with and without plasma generation was performed via sooted-plate technique. Production of atoms and radicals in the discharge triggered combustion chemistry decreasing the ignition delay time. As a result, the detonation cell size was reduced by a factor of 1.5 − 2, while passing through the region of the discharge.

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Fast gas heating and radial distribution of active species in nanosecond capillary discharge in pure nitrogen and N₂:O₂mixtures

Cited by 39 publications

References 66 publications

TALIF measurements of atomic nitrogen in the afterglow of a nanosecond capillary discharge

TALIF measurements of atomic nitrogen in the afterglow of a nanosecond capillary discharge

Effect of non-equilibrium plasma on decreasing the detonation cell size

Influence of moderate pressure nanosecond discharge on the structure of detonation wave

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Fast gas heating and radial distribution of active species in nanosecond capillary discharge in pure nitrogen and N2:O2mixtures

Cited by 39 publications

References 66 publications

TALIF measurements of atomic nitrogen in the afterglow of a nanosecond capillary discharge

TALIF measurements of atomic nitrogen in the afterglow of a nanosecond capillary discharge

Effect of non-equilibrium plasma on decreasing the detonation cell size

Influence of moderate pressure nanosecond discharge on the structure of detonation wave

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Fast gas heating and radial distribution of active species in nanosecond capillary discharge in pure nitrogen and N₂:O₂mixtures