Gas-dynamic effects in the interaction of a motionless optical pulsating discharge with gas

Tishchenko, V. N.; Grachev, G. N.; Смирнов, А. Л.; Павлов, А. А.; Golubev, Maxim

doi:10.1070/qe2008v038n01abeh013601

Cited by 6 publications

(2 citation statements)

References 3 publications

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“…For visual observation of the process of plasma formation in a supersonic flow and of the produced thermal track the installation is supplied with an optical diagnostic system. The optical scheme used in this work for measuring a small signal of thermal track radiation against the background of high-power radiation of the plasmoid comprised an optical tract (7,8 ) for transferring the image of a point of thermal track ( 4 ) to an entrance slit of monochromator ( 9 ). A DMR-4 double monochromator was used, which reliably suppressed extraneous emission.…”

Section: Methodsmentioning

confidence: 99%

Influence of an optical pulsed discharge on the structure of a supersonic air flow

Malov¹,

Orishich²

2014

Quantum Electron.

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Section: Methodsmentioning

confidence: 99%

Influence of an optical pulsed discharge on the structure of a supersonic air flow

Malov¹,

Orishich²

2014

Quantum Electron.

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“…Nevertheless, such mechanisms in laser breakdown of supersonic gas flow under pulsed or repetitively pulsed laser radiation were studied [9][10][11][12][13][14]. The effect of a resonance conjugation of separate shock waves into a quasistationary shock wave at high-repetition-rate laser radiation in a jet nozzle was manifested in [14,15] as one of perspective operation modes of supersonic laser propulsion. But the experiments carried out by the authors demonstrated essential instability of thrust production in this case.…”

Section: Introductionmentioning

confidence: 99%

Supersonic laser propulsion

Rezunkov

Schmidt²

2014

Appl. Opt.

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To produce supersonic laser propulsion, a new technique based on the interaction of a laser-ablated jet with supersonic gas flow in a nozzle is proposed. It is shown that such parameters of the jet, such as gas-plasma pressure and temperature in the ablation region as well as the mass consumption rate of the ablated solid propellant, are characteristic in this respect. The results of numerical simulations of the supersonic laser propulsion are presented for two types of nozzle configuration. The feasibility to achieve the momentum coupling coefficient of C(m)∼10(-3) N/W is shown.

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Gas flows generated by pulse-periodic optical breakdown and quiet optical discharge

Androsenko,

Kotov,

Solovyov

et al. 2024

Physics of Fluids

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Quiet optical discharge in high-pressure xenon is visually stable pre-breakdown stage of optical discharge supported by pulse-periodic short-wavelength infrared laser radiation with intensity of the order of 109 W/cm2. Increasing the laser intensity leads to the transition of the quiet discharge into a pulse-periodic optical breakdown. In this study, quasi-stationary directional flows generated by both the quiet discharge and the optical breakdown are observed. The flows and their initial stages under limited number of discharge pulses are visualized by shadow imaging method using a point-like laser-plasma radiation source. It is shown that the gas streams outflow points in a quiet discharge correspond to the positions of the laser radiation intensity local maxima in the focal beam waist with astigmatism complicated by defocusing effect of thermal lens arising in the discharge zone. The pulse-periodic optical breakdown emits a turbulent gas flow toward the laser beam. The beam refraction on density gradients in the turbulent flow causes the breakdown instability from pulse to pulse. It was found that time-average absorption of laser radiation in a quiet discharge is about 3% (also in a pulse), while that in optical breakdown is 15% and higher (from 70% to 100% in a pulse). Laser beam intensity for quiet discharge at pulse repetition rate νp = 20 kHz ranges from 1.3 × 109 to 1.5 × 109 W/cm2. At intensities above 4 × 109 W/cm2 and repetition rates νp > 50–55 kHz, laser breakdowns are observed in each laser pulse with the focal ratio f/d ≤ 7. At f/d = 10.6 and νp > 28 kHz, the quiet discharge does not transit to laser breakdown due to defocusing by the thermal lens induced.

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Gas-dynamic effects in the interaction of a motionless optical pulsating discharge with gas

Cited by 6 publications

References 3 publications

Influence of an optical pulsed discharge on the structure of a supersonic air flow

Influence of an optical pulsed discharge on the structure of a supersonic air flow

Supersonic laser propulsion

Gas flows generated by pulse-periodic optical breakdown and quiet optical discharge

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