Laser-induced plasma ignition studies in a model scramjet engine

Brieschenk, Stefan; O’Byrne, Sean; Kleine, H.

doi:10.1016/j.combustflame.2012.08.011

Cited by 107 publications

(41 citation statements)

References 9 publications

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“…Plasmas generated by pulsed or continuous lasers 10,15,22 have been of particular interest in the fields of laser-induced breakdown spectroscopy, 18 chemical vapour deposition, 2 laser-driven inertially confined fusion, 5 drag reduction 19 as well as combustion augmentation and ignition 4 since they were first discovered in the 1960s. A unified theory of laserinduced breakdown does not exist at this point, and experimental measurements reported in the literature often do not contain all the details regarding the laser beam characteristics such as wavelength, linewidth, polarisation, unfocused diameter, divergence, pulse shape, and duration (transverse and longitudinal modes) as well as the characteristics of the focusing system such as focal length, aperture size, alignment to the laser beam, lens shape, lens quality, and refractive index 13,17 which would allow a comparison between different investigations.…”

Section: Introductionmentioning

confidence: 99%

On the measurement of laser-induced plasma breakdown thresholds

Brieschenk

Kleine

O’Byrne

2013

Journal of Applied Physics

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Articles you may be interested inComparison of the electron density measurements using Thomson scattering and emission spectroscopy for laser induced breakdown in one atmosphere of helium Appl. Phys. Lett. 99, 261504 (2011) The breakdown threshold of a gas exposed to intense laser-radiation is a function of gas and laser properties. Breakdown thresholds reported in the literature often vary greatly and these differences can partially be traced back to the method that is typically used to determine breakdown thresholds. This paper discusses the traditional method used to determine breakdown thresholds and the potential errors that can arise using this approach, and presents an alternative method which can yield more accurate data especially when determining breakdown thresholds as functions of gas pressure. V C 2013 AIP Publishing LLC.[http://dx

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Section: Introductionmentioning

confidence: 99%

On the measurement of laser-induced plasma breakdown thresholds

Brieschenk

Kleine

O’Byrne

2013

Journal of Applied Physics

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“…Previous spark-ignition experiments in supersonic streams using a laser source have been successfully performed with a laser-deposited energy of 300-400 mJ per spark. [5][6][7] Optical ignition using lasers allow the generation of plasma in the core of the stream, away from the wall. At this stage, however, there are no laser systems that can operate at the desired repetition frequencies, pulse energies and acceptable levels of wall-plug efficiencies.…”

Section: Repetitively Pulsed Ignition For Supersonic Flowsmentioning

confidence: 99%

“…[8][9][10] Methods for ignition augmentation, 7 using flow-external energy sources 10 that directly or indirectly generate plasma, 9 include electric discharges in the combustible medium, 11 electric discharges in a plasma buffer gas (plasma torches), 12 microwaves 13 and lasers. [5][6][7] The purpose of this paper is the characterization of an off-the-shelf automotive capacitive-discharge spark ignition system to provide ignition in a cavity of a supersonic stream. …”

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confidence: 99%

“…Plasma generated by flowfield-external ignition sources can significantly reduce, virtually eliminate ignition delay times. [5][6][7] A number of literature reviews have been devoted to plasma-assisted ignition and combustion in supersonic flows. [8][9][10] Methods for ignition augmentation, 7 using flow-external energy sources 10 that directly or indirectly generate plasma, 9 include electric discharges in the combustible medium, 11 electric discharges in a plasma buffer gas (plasma torches), 12 microwaves 13 and lasers.…”

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confidence: 99%

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Characterization of a Spark Ignition System for Flameholding Cavities

Brieschenk

Pontalier

Duffaut

et al. 2014

45th AIAA Plasmadynamics and Lasers Conference

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This paper presents an experimental investigation of a capacitive-discharge spark ignition system designed to promote ignition in CH4-and C2H4-fuelled supersonic combustors. The purpose of this study is the characterization of the ignition system and the plasma generated in the discharge. Schlieren and luminescence imaging are used to visualize the temporal evolution of the spark plasma. Transient voltages and currents across the primary-side of the ignition coil and input-side of the ignition unit are recorded using a high-speed data acquisition system. Three different ignition coils are tested with two different spark plug gaps in an attempt to increase the performance of the ignition system which is evaluated through spatially and temporally integrated luminescence recordings as well as temporally integrated photo diode signals. The data suggests that an increase in performance of a factor of 4-5 over the baseline setup can be achieved. A capacitive ignition lead is used to assess whether or not any capacitance on the coil secondary side can increase the performance of the ignition system. The experiments have also shown that the ignition system parameters can be set to cause sufficient heating of the electrodes to support ignition from a combined glow-spark plug setup.

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“…The cantilevered ramp injector has been employed as an effective fuel injection strategy in the shock-induced combustion ramjet (shcramjet) engine, 1,2) and the shcramjet engine is one of the promising propulsion systems for airbreathing hypersonic vehicles.…”

Section: Introductionmentioning

confidence: 99%

Influences of Angles of Attack and Sideslip on the Flow Field of a Cantilevered Ramp Injector in Supersonic Flows

Huang

Wang

Liu

et al. 2014

Trans. Japan Soc. Aero. S Sci.

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The cantilevered ramp injector has been employed as an effective fuel injection strategy in the shock-induced combustion ramjet engine, and its flow field characteristics have attracted increasing attention. Three-dimensional ReynoldsAveraged Navier-Stokes (RANS) equations coupled with the RNG k-" turbulence model have been employed to investigate the flow field of a cantilevered ramp injector in a freestream with a Mach number of 6.0. The effects of the angles of attack and sideslip on the flow field of a cantilevered ramp injector have been studied, and the predicted axial distribution of the maximum injectant mole fraction shows good agreement with the available experimental data in public literature. The obtained results show that the case with an angle of attack 3 can promote the mixing process between the fuel and air most efficiently in a typical cantilevered ramp injector. However, it cannot prevent the premature ignition of the premixed combustible flow. The mixing process cannot be promoted when the normalized axial distance is larger than 7.55 in cases with different angles of sideslip, and larger angles of sideslip can reduce the effect of premature ignition for the premixed combustible flow.

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Laser-induced plasma ignition studies in a model scramjet engine

Cited by 107 publications

References 9 publications

On the measurement of laser-induced plasma breakdown thresholds

On the measurement of laser-induced plasma breakdown thresholds

Characterization of a Spark Ignition System for Flameholding Cavities

Influences of Angles of Attack and Sideslip on the Flow Field of a Cantilevered Ramp Injector in Supersonic Flows

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