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3 edition of Ignition and structure of a laminar diffusion flame in the field of a vortex found in the catalog.

Ignition and structure of a laminar diffusion flame in the field of a vortex

Ignition and structure of a laminar diffusion flame in the field of a vortex

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  • 18 Currently reading

Published by National Aeronautics and Space Administration, Langley Research Center, National Technical Information Service, distributor in Hampton, Va, [Springfield, Va .
Written in English

    Subjects:
  • Vortex-motion.,
  • Laminar flow.

  • Edition Notes

    StatementMichelle G. Macaraeg, T.L. Jackson, M.Y. Hussaini.
    SeriesICASE report -- no. 91-69., NASA contractor report -- 189545., NASA contractor report -- NASA CR-189545.
    ContributionsJackson, Thomas L. 1957-, Hussaini, M. Yousuff., Langley Research Center.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15370003M

    1. Introduction. Laminar gas jet diffusion flames have been intensively studied in combustion science. The understanding of diffusion flame stabilization mechanisms is essential for industrial applications, such as engine and furnace designs, safety consideration, costs cutting, combustion efficiency improvement and pollutant emissions by: This article provides a review of modeling methods for combustion instability studies. After a presentation of classical material the paper focuses on modern methods. Ignition and structure of a laminar diffusion flame in the field of a vortex. ICASE 91–69, ICASE. Growth of a diffusion flame in the field of a vortex. In Recent Cited by:

    NASA Contractor Report ICASE Report No. IC S IGNITION DYNAMICS OF A LAMINAR _, {13 DIFFUSION FLAME IN THE FIELD OF A 2! VORTEX EMBEDDED IN A SHEAR FLOW Z Michele G. Macaraeg T.L. Jackson M.Y. Hussaini:E P, _Z_LU C_JW b_ZW _. ZC)_O,'_Z _ Contract NAS June Institute for Computer Applications in Science and Engineering. Experimental results are presented for the roll-up and burning of a diffusion flame in a laminar vortex ring formed by impulsively issuing fuel from a round nozzle into an oxidizer environment under microgravity by:

    Get this from a library! Ignition and structure of a laminar diffusion flame in a compressible mixing layer with finite rate chemistry. [C E Grosch; T L Jackson; Institute for Computer Applications in Science and Engineering.]. So, vortex structure spontaneously arising in the tube affects the flame jet structure leading to its extinction. It is known that the properties of hydrogen are very different from the thermal and chemical properties of hydrocarbons—H 2 has a low density and high values of the diffusion coefficient and, as a result, a high-flame propagation Author: Dubnishchev Yuri Nikolaevich, Lemanov Vadim Vladimirovich, Lukashov Vladimir Vladimirovich, Arbuzov.


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Ignition and structure of a laminar diffusion flame in the field of a vortex Download PDF EPUB FB2

Emphasis is placed on the ignition time and location as a function of vortex Reynolds number and initial temperature differences of the reacting species. The study brings out the influence of the. This article deals with the dynamics of ignition for a diffusion flame rolled up in a vortex.

The flame is formed at the interface between a cold fuel and a hot oxidizer. The calculations are carried out in the thermodiffusive approximation, where all the volumetric expansion effects are neglected.

Regimes of ignition are obtained for different vortex Reynolds numbers and oxidizer by: This article deals with the dynamics of ignition for a diffusion flame rolled up in a vortex.

The flame is formed at the interface between a cold fuel and a hot oxidizer. The calculations are carried out in the thermodiffusive approximation, where all the volumetric expansion effects are by: Ignition Dynamics of a Laminar Diffusion Flame in the Field of a Vortex Embedded in a Shear Flow Article (PDF Available) in Combustion Science and Technology () July with 18 Reads.

Get this from a library. Ignition dynamics of a laminar diffusion flame in the field of a vortex embedded in a shear flow. [Michele G Macaraeg; Thomas L Jackson; M Yousuff Hussaini; Institute for Computer Applications in Science and Engineering.]. Ignition dynamics of a laminar diffusion flame in the field of a vortex embedded in a shear flow.

It is found that the interaction of the streamwise vortex with shear gives rise to small-scale velocity oscillations which increase in magnitude with shear strength. and emphasis is placed on the ignition time and structure as a function.

Ignition and Structure of a Laminar Diffusion Flame in a Compressible Mixing Layer with Finite Rate Chemistry Article (PDF Available) in Physics of Fluids A Fluid Dynamics 3(12) January IGNITION AND STRUCTURE OF A LAMINAR DIFFUSION FLAME IN THE FIELD OF A VORTEX Michkle G.

Macaraeg NASA Langley Research Center Hampton, Virginia T.L. Jackson Department of Mathematics and Statistics Old Dominion University Norfolk, Virginia M.Y. In order to identify some of the mathematical problems encountered in analyzing the ignition and flame spread in mixing layers, we shall describe the structure of the laminar mixing layer between two parallel streams of a fuel and air, initially separated by a splitter plate, undergoing an Arrhenius by: Laminar burning velocity for a typical H- and L-type natural gas, a typical LNG and propane compared to CH 4 (pressure = 18 bar, air temperature = °C, fuel temperature = °C).

Ethane, C 2 H 6, and propane, C 3 H 8, have slightly higher maximal laminar flame speeds than CH 4 of about – m/s. Ignition and structure of a laminar diffusion flame in the field of a vortex Author: Michéle G Macaraeg ; T L Jackson ; M Y Hussaini ; Langley Research Center.

() CRITERION FOR IGNITION OF A FUEL MIXTURE BY ACOUSTIC STREAMING. () Ignition and Structure of a Laminar Diffusion Flame in the Field of a Vortex. Combustion Science and TechnologyAnalysis of Self-Ignition for Nonunit Lewis Number. SIAM Journal on Applied MathematicsCited by: It examines laminar premixed combustion and laminar non-premixed combustion.

The most common example of a non-premixed flame is a diffusion flame. As time progresses the flame is extended and “wound up” by the vortex flow field and the viscous core of the vortex spreads, converting the motion in the core to a solid-body rotation.

The kinematics of the flame extension and distortion is described and the effect of the local-flow field upon local-flame structure is analyzed in by: Figure 1: Strained diffusion interface. One candidate for leveraging the effects of strain is to allow a reaction interface or strip of reactants to be convected in the field of an axial vortex such as that shed downstream of a lobed or forced mixer nozzle.

Marble, F.E.: Growth of a diffusion flame in the field of a vortex. Recent advances in the aerospace sciences. In: Casci, C., Bruno, C. (eds.) Honor of Luigi Crocco on His 75th Birthday, Springer, Boston, MA, pp.

– () CrossRef Google ScholarCited by: 1. With an AC electric field, a magnetic field can be induced due to the displacement current by the time-varying component of the electric field [23].

Charged particles such as ions in a flame zone produced by chemi-ionization, together with PAHs and soot particles [24], [25], [26], are subjected to Cited by: The flame development with O 3 is faster than that without O The vortex structure with O 3 is more continuous in the recirculation zone, and the flame recirculation zone moves forward.

The enhanced combustion effect of O 3 is more obvious in the low-temperature region. The plasma O 3 will reduce the fluctuation of v x ′v x ’, especially at the peak point. Laminar Diffusion Flames (Laminar Non-Premixed Flames) • In a diffusion flame combustion occurs at the in-terface between the fuel gas and the oxidant gas, and the burning depends more on rate of diffu-sion of reactants than on the rates of chemical pro-cesses involved.

• It is more difficult to give a general treatment ofFile Size: 3MB. AC electric field induced vortex in laminar coflow diffusion flames This cracked structure enhanced flame propagation speed for the initial period of combustion and led to reduction in flame. The interaction between a laminar vortex ring and a flat diffusion flame is investigated via direct numerical simulations.

The diffusion flame is generated by a “spark” and is implemented as initial condition for the simulations. The chemistry is modeled by an Arrhenius, single step, irreversible reaction.

A heat-releasing flame sheet is also considered in addition to the finite rate by:   Subsequent to ignition, for the Arrhenius chemistry addressed, the lead shock will rapidly be transformed into a thin detonation on the fuel side of the ignition kernel, and, under suitable conditions, a deflagration may extend far downstream, along with the diffusion flame that must separate the rich and lean reaction by: Twenty-Second Symposium (International) on Combustion/The Combustion Institute, /pp.

INTERACTION OF A VORTEX RING AND A LAMINAR FLAME J. JAROSINSKI, J. H. S. LEE AND R. KNYSTAUTAS McGill University, Montreal, Canada The present paper reports the results of an experimental study of the interaction of a vortex ring (or more appropriately, a vortex bubble) with a laminar by: