Geometrical study of spark ignition in two dimensions

Thiele, M.; Warnatz, Jürgen; Maas, Ulrich

doi:10.1088/1364-7830/4/4/303

Cited by 42 publications

(34 citation statements)

References 23 publications

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“…The localised ignition and subsequent flame propagation in homogeneous mixtures have been studied from analytical [1][2][3][4], experimental [5][6][7][8][9][10] and numerical [10][11][12][13][14][15][16][17] viewpoints by several authors. Interested readers are referred to Ref.…”

Section: Introductionmentioning

confidence: 99%

“…[18] and references therein for an extensive review on localised forced ignition of homogeneous mixtures. In recent times, Direct Numerical Simulation (DNS) has become an important tool for fundamental understanding and subsequent modelling of complex combustion phenomena including localised forced ignition of homogeneous [15][16][17] and inhomogeneous [19][20][21] gaseous and droplet-laden [22][23][24] mixtures. An extensive review of experimental evaluation of minimum ignition energy, optimum energy deposition time for homogeneous mixture can be found in Lefebvre [5], which indicated that the spark kernel needs to exceed a critical dimension (d q ) for the resulting flame to survive.…”

Section: Introductionmentioning

confidence: 99%

“…The adverse effects of turbulent velocity fluctuation on ignition and early stages of flame propagation in homogeneous mixtures were reported and analysed from various viewpoints in Refs. [5][6][7][8][9][10][11][12][13][14][15][16][17]. In a recent analysis Wandel [23] demonstrated that the absence of a substantial region containing hot products with small values of scalar dissipation rate could be detrimental to the ignition of partiallypremixed gases resulting from droplet-laden mixtures, and such an extinction predictor can also be relevant to the ignition of gaseous homogeneous mixtures.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Energy Deposition Characteristics on Localised Forced Ignition of Homogeneous Mixtures

Patel

Chakraborty

2015

International Journal of Spray and Combustion Dynamics

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The effects of the characteristic width of the energy deposition profile and the duration of energy deposition by the ignitor on localised forced ignition of stoichiometric and fuel-lean homogeneous mixtures have been analysed using simplified chemistry three-dimensional compressible Direct Numerical Simulation (DNS) for different values of root-mean-square turbulent velocity fluctuation. The localised forced ignition is modelled using a source term in the energy transport equation, which deposits energy in a Gaussian manner from the centre of the ignitor over a stipulated period of time. It has been shown that the width of ignition energy deposition and the duration over which ignition energy is deposited have significant influences on the success of ignition and subsequent flame propagation. An increase in the width of ignition energy deposition (duration of energy deposition) for a given amount of ignition energy has been found to have a detrimental effect on the ignition event, which may ultimately lead to misfire. Moreover, an increase in uЈ gives rise to augmented heat transfer rate from the hot gas kernel, which in turn leads to a reduction in the extent of overall burning for both stoichiometric and fuel-lean homogeneous mixtures but the detrimental effects of high values of uЈ on localised ignition are particularly prevalent for fuel-lean mixtures.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of Energy Deposition Characteristics on Localised Forced Ignition of Homogeneous Mixtures

Patel

Chakraborty

2015

International Journal of Spray and Combustion Dynamics

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“…The localised ignition and subsequent flame propagation in homogeneous mixtures have been studied from analytical [1][2][3][4], experimental [5][6][7][8][9] and numerical [10][11][12][13] viewpoints by several authors. Limited efforts have been given to the localised forced ignition of inhomogeneous mixtures.…”

Section: Introductionmentioning

confidence: 99%

Direct Numerical Simulations of Localised Forced Ignition in Turbulent Mixing Layers: The Effects of Mixture Fraction and Its Gradient

Chakraborty

Mastorakos

2007

Flow Turbulence Combust

104

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The effects of mixture fraction value ξ and the magnitude of its gradient |∇ξ| at the ignitor location on the localised forced ignition of turbulent mixing layers under decaying turbulence is studied based on three-dimensional compressible Direct Numerical Simulations (DNS) with simplified chemistry. The localised ignition is accounted for by a spatial Gaussian power distribution in the energy transport equation, which deposits energy over a prescribed period of time. In successful ignitions, it is observed that the flame shows a tribrachial structure. The reaction rate is found to be greater in the fuel rich side than in stoichiometric and fuel-lean mixtures. Placing the ignitor at a fuel-lean region may initiate ignition, but extinction may eventually occur if the diffusion of heat from the hot gas kernel overcomes the heat release due to combustion. It is demonstrated that ignition in the fuel lean region may fail for an energy input for which self-sustained combustion has been achieved in the cases of igniting at stoichiometric and fuel-rich locations. It is also found that the fuel reaction rate magnitude is negatively correlated with density-weighted scalar dissipation rate in the most reactive region. An increase in the initial mixture fraction gradient at the ignition centre for the ignitor placed at stoichiometric mixture decreases the spreading of the burned region along the stoichiometric mixture fraction isosurface. By contrast, the mass of the burned region increases with an increase in the initial mixture fraction gradient at the ignition location, as for a given ignition kernel size the thinner mixing layer includes more fuel-rich mixture, which eventually makes the overall burning rate greater than that compared to a thicker mixing layer where relatively a smaller amount of fuel-rich mixture is engulfed within the hot gas kernel.

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“…Spark ignition was mainly investigated in connection with ignition in Otto engines. Detailed 2D modelling of hydrodynamics together with chemical kinetics 11 and a comparison with LIF measurements of OH radicals 12 are available in this field. Ignition by the direct injection of an arc discharge is interesting for hypersonic applications.…”

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confidence: 99%

Plasma-assisted combustion

Starikovskii

Anikin

Kosarev

et al. 2006

Pure and Applied Chemistry

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing the burden, to Department of Defense, Washington Headquarters Services, Directorate for Information , 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. REPORT DATE (DD-MM-YYYY)12-03-2007 REPORT TYPE Final Report DATES COVERED (From -To AUTHOR(S)Professor Andrei Y Starikovskii 5e. WORK UNIT NUMBER PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES)Moscow Institute of Physics and Technology 9 Institutski Lane Dolgoprudny 141700 Russia PERFORMING ORGANIZATION REPORT NUMBERN/A SPONSOR/MONITOR'S ACRONYM(S) 9. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES)EOARD PSC 821 BOX 14 FPO AE 09421-0014 SPONSOR/MONITOR'S REPORT NUMBER(S)CRDF 02-9003 DISTRIBUTION/AVAILABILITY STATEMENTApproved for public release; distribution is unlimited. SUPPLEMENTARY NOTES ABSTRACTThis report results from a contract tasking Moscow Institute of Physics and Technology as follows: The contractor will investigate the use of high voltage, nano-second plasma discharges to ignite and efficiently combust fuel/air mixtures in high speed flows. This strongly nonequilibrium low-temperature plasma has a high mean energy of electrons and will provide a source of reactive atoms, radicals, and excited molecules which has been shown to enhance ignition and combustion. The short duration of the pulses results in relatively low power requirements for generating the discharge. The goal is to demonstrate and understand the physics of energy exchange, ignition and combustion . Also, the use of this type of plasma for aerodynamic flow control will be investigated. Finally, applicability to use this type of discharge to directly initiate a detonation wave will be investigated. Chapter 1 SUBJECT TERMS AbstractA review was made which discusses different types of the discharges applied for plasma assisted ignition and combustion. Special attention to experimental and theoretical analysis of some plasma parameters was given, such as reduced electric field, electron density and energy branching for different gas discharges. Streamers, pulsed nanosecond discharges, dielectric barrier discharges, radio frequency discharges, atmospheric pressure glow discharges are considered. Detailed measurements of the parameters of a streamer flash development in the air for the pressure range 90-1300 Torr have been carried out in the plane-to-plane geometry for 20-42 ...

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Geometrical study of spark ignition in two dimensions

Cited by 42 publications

References 23 publications

Effects of Energy Deposition Characteristics on Localised Forced Ignition of Homogeneous Mixtures

Effects of Energy Deposition Characteristics on Localised Forced Ignition of Homogeneous Mixtures

Direct Numerical Simulations of Localised Forced Ignition in Turbulent Mixing Layers: The Effects of Mixture Fraction and Its Gradient

Plasma-assisted combustion

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