Glow discharge in singlet oxygen

Vagin, N. P.; Ионин, А. А.; Klimachev, Yu. M.; Кочетов, И. В.; Napartovich, A. P.; Sinitsyn, D. V.; Yuryshev, Nikolai N

doi:10.1134/1.1561115

Cited by 23 publications

(19 citation statements)

References 12 publications

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“…At P 0 = 60 Torr, ≈ 7% of the discharge power is stored in SDO, compared with ≈ 9.5% at P 0 = 120 Torr (see table 1). This behaviour is consistent with lower E/N values measured at P 0 = 120 Torr (see figure 8), at which the predicted fraction of the discharge power spent on SDO excitation increases [1,3,4,12]. This result demonstrates key advantage of operating the pulser-sustainer discharge at high pressure, on condition that the discharge stability can be maintained.…”

Section: Resultssupporting

confidence: 87%

Design and operation of a supersonic flow cavity for a non-self-sustained electric discharge pumped oxygen–iodine laser

Hicks¹,

Tirupathi²,

Jiang³

et al. 2007

J. Phys. D: Appl. Phys.

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The paper presents results of a high-pressure, non-self-sustained crossed discharge-M = 3 supersonic laser cavity operation. A stable and diffuse pulser-sustainer discharge in O 2-He flows is generated at pressures of up to P 0 = 120 Torr and discharge powers of up to 2.1 kW. The reduced electric field in the dc sustainer discharge ranges from 0.6 × 10 −16 to 1.2 × 10 −16 V cm 2. Singlet delta oxygen (SDO) yield in the discharge, up to 5.0-5.7% at the flow temperatures of 400-420 K, was inferred from the integrated intensity of the (0,0) band of the O 2 (a 1 → X 3) infrared emission spectra calibrated using a blackbody source. The yield increases with the discharge power and remains nearly independent of the O 2 fraction in the mixture (in the 10-20% range). Static pressure and temperature measurements in the supersonic cavity show that a steady-state M = 3 flow in the cavity can be sustained for up to 20 s, at the flow temperature of T = 120 ± 15 K. The results suggest that the measured SDO yield exceeds the threshold yield at the cavity temperature by up to a factor of 2.5. PLIF iodine vapour visualization in the supersonic cavity, which showed the presence of large-scale structures, suggests the need to improve iodine vapour mixing with the main oxygen-helium flow.

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Section: Resultssupporting

confidence: 87%

Design and operation of a supersonic flow cavity for a non-self-sustained electric discharge pumped oxygen–iodine laser

Hicks¹,

Tirupathi²,

Jiang³

et al. 2007

J. Phys. D: Appl. Phys.

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“…Development of an electrically pumped oxygen-iodine laser has recently attracted considerable attention [1][2][3][4][5][6][7][8][9]. The main motivation for these efforts is to reduce the weight, complexity and operational difficulties associated with a chemical oxygenion laser (COIL), such as excessive weight, hazardous liquid chemical storage and the use of two-phase pumping systems.…”

Section: Introductionmentioning

confidence: 99%

“…It is well known that in nonequilibrium plasmas, the energy fraction going into electron impact excitation of O 2 (a 1 ) and O 2 (b 1 ) states in O 2 -Ar and O 2 -He mixtures reaches a maximum at rather low E/N values, E/N < 1 × 10 −16 V cm 2 [1,3,4]. These E/N values are considerably lower than those achieved in self-sustained nonequilibrium electric discharges (dc, RF or microwave), E/N ∼ (1-10) × 10 −16 V cm 2 .…”

mentioning

confidence: 99%

Singlet oxygen generation in a high pressure non-self-sustained electric discharge

Hicks¹,

Norberg²,

Shawcross³

et al. 2005

J. Phys. D: Appl. Phys.

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This paper presents results of singlet oxygen generation experiments in a high-pressure, non-self-sustained crossed discharge. The discharge consists of a high-voltage, short pulse duration, high repetition rate pulsed discharge, which produces ionization in the flow, and a low-voltage dc discharge which sustains current in a decaying plasma between the pulses. The sustainer voltage can be independently varied to maximize the energy input into electron impact excitation of singlet delta oxygen (SDO). The results demonstrate operation of a stable and diffuse crossed discharge in O 2 -He mixtures at static pressures of at least up to P 0 = 380 Torr and sustainer discharge powers of at least up to 1200 W, achieved at P 0 = 120 Torr. The reduced electric field in the positive column of the sustainer discharge varies from E/N = 0.3 × 10 −16 to 0.65 × 10 −16 V cm 2 , which is significantly lower than E/N in self-sustained discharges and close to the theoretically predicted optimum value for O 2 (a 1 ) excitation. Measurements of visible emission spectra O 2 (b 1 → X 3 ) in the discharge afterglow show the O 2 (b 1 ) concentration to increase with the sustainer discharge power and to decrease as the O 2 fraction in the flow is increased. Rotational temperatures inferred from these spectra in 10% O 2 -90% He flows at P 0 = 120 Torr and mass flow rates ofṁ = 0.73-2.2 g s −1 are 365-465 K. SDO yield at these conditions, 1.7% to 4.4%, was inferred from the integrated intensity of the (0,0) band of the O 2 (a 1 → X 3 ) infrared emission spectra calibrated using a blackbody source. The yield remains nearly constant in the discharge afterglow, up to at least 15 cm distance from the discharge. Kinetic modelling calculations using a quasi-one-dimensional nonequilibrium pulser-sustainer discharge model coupled with the Boltzmann equation for plasma electrons predict gas temperature rise in the discharge in satisfactory agreement with the experimental measurements. However, the model overpredicts the O 2 (a 1 ) yield by a factor of 2-2.5, which suggests that the model's description of nonequilibrium O 2 -He plasma kinetics at high pressures is not quite adequate.

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“…However, the use of this approach at high Mach numbers also requires operating at rather high stagnation pressures. Also, to optimize the O 2 a 1 yield in the plasma, the discharge should operate at E=N values where the energy input into the target O 2 a 1 state is maximum, E=N < 1 10 16 V cm 2 [19,20,28].…”

Section: Development Of Electrically Excitedmentioning

confidence: 99%

“…O VER recent years, there has been a significant increase of interest in applications of nonequilibrium plasmas for magnetohydrodynamic (MHD) flow control [1][2][3][4][5][6], combustion augmentation [7][8][9][10][11][12][13][14][15][16], and onboard directed energy sources [17][18][19][20][21][22][23][24][25][26][27][28][29][30]. One of the key factors affecting development and scaling of these applications is the ability to efficiently generate, sustain, and control large-volume nonequilibrium plasmas in high-speed flows, at high pressures, and at high electron densities.…”

Section: Introductionmentioning

confidence: 99%

Repetitively Pulsed Nonequilibrium Plasmas for Magnetohydrodynamic Flow Control and Plasma-Assisted Combustion

Adamovich

Lempert

Nishihara

et al. 2008

Journal of Propulsion and Power

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This paper demonstrates significant potential of the use of high-voltage, nanosecond pulse duration, high pulse repetition rate discharges for aerospace applications. The present results demonstrate key advantages of these discharges: 1) stability at high pressures, high flow Mach numbers, and high-energy loadings by the sustainer discharge, 2) high-energy fractions going to ionization and molecular dissociation, and 3) targeted energy addition capability provided by independent control of the reduced electric field of the direct current sustainer discharge. These unique capabilities make possible the generation of stable, volume-filling, low-temperature plasmas and their use for high-speed flow control, nonthermal flow ignition, and gasdynamic lasers. In particular, the crossed pulsersustainer discharge was used for magnetohydrodynamic flow control in cold M 3 flows, providing first evidence of cold supersonic flow deceleration by Lorentz force. The pulsed discharge (without sustainer) was used to produce plasma chemical fuel oxidation, ignition, and flameholding in premixed hydrocarbon-air flows, in a wide range of equivalence ratios and flow velocities and at low plasma temperatures, 150-300 C. Finally, the pulser-sustainer discharge was used to generate singlet oxygen in an electric discharge excited oxygen-iodine laser. Laser gain and output power are measured in the M 3 supersonic cavity.

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Glow discharge in singlet oxygen

Cited by 23 publications

References 12 publications

Design and operation of a supersonic flow cavity for a non-self-sustained electric discharge pumped oxygen–iodine laser

Design and operation of a supersonic flow cavity for a non-self-sustained electric discharge pumped oxygen–iodine laser

Singlet oxygen generation in a high pressure non-self-sustained electric discharge

Repetitively Pulsed Nonequilibrium Plasmas for Magnetohydrodynamic Flow Control and Plasma-Assisted Combustion

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