Simultaneous stereo particle image velocimetry and double-pulsed planar laser-induced fluorescence of turbulent premixed flames

Filatyev, Sergei A.; Thariyan, Mathew P.; Lucht, Robert P.; Gore, Jay P.

doi:10.1016/j.combustflame.2007.02.005

Cited by 25 publications

(13 citation statements)

References 27 publications

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“…Through HSLSFV images, the progression of the propagating flame is captured, thus obtaining qualitative information about flame shape and scales of flame front wrinkling [1,[3][4][5][6][7][9][10][11]. PIV allows the measurement of the velocity field ahead of the flame front, leading to the quantification of the flame/vortex interaction [10,16,17].…”

Section: Introductionmentioning

confidence: 99%

Large Eddy Simulation and PIV Measurements of Unsteady Premixed Flames Accelerated by Obstacles

Sarli

Benedetto

Russo

et al. 2009

Flow Turbulence Combust

103

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Section: Introductionmentioning

confidence: 99%

Large Eddy Simulation and PIV Measurements of Unsteady Premixed Flames Accelerated by Obstacles

Sarli

Benedetto

Russo

et al. 2009

Flow Turbulence Combust

103

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“…To examine the flame-flow interactions, we also need to define the flame front location. A number of previous studies performed CH-or OH-planar laser-induced fluorescence (PLIF) measurements to define the flame front location, in which the gradients of CH or OH radical signal were used to indicate the flame front position [18,19,24,33]. The flame front can also be detected from the abrupt change in the seeding particle densities between the reactants and the products [34,35] (see Fig.…”

Section: Post-processing the Piv Datamentioning

confidence: 99%

Examining flow-flame interaction and the characteristic stretch rate in vortex-driven combustion dynamics using PIV and numerical simulation

Hong

Speth

Shanbhogue

et al. 2013

Combustion and Flame

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In this paper, we experimentally investigate the combustion dynamics in lean premixed flames in a laboratory scale backward-facing step combustor in which flame-vortex driven dynamics are observed. A series of tests was conducted using propane/hydrogen/air mixtures for various mixture compositions at the inlet temperature ranging from 300 K to 500 K and at atmospheric pressure. Pressure measurements and high speed particle image velocimetry (PIV) are used to generate pressure response curves and phase-averaged vorticity and streamlines as well as the instantaneous flame front, respectively, which describe unsteady flame and flow dynamics in each operating regime. This work was motivated in part by our earlier study where we showed that the strained flame consumption speed S c can be used to collapse the pressure response curves over a wide range of operating conditions. In previous studies, the stretch rate at which S c was computed was determined by trial and error. In this study, flame stretch is estimated using the instantaneous flame front and velocity field from the PIV measurement. Independently, we also use computed strained flame speed and the experimental data to determine the characteristic values of stretch rate near the mode transition points at which the flame configuration changes. We show that a common value of the characteristic stretch rate exists across all the flame configurations. The consumption * Corresponding author. 77 Massachusetts Avenue, Room 3-344, Cambridge MA 02139, USA. Fax: +1-617-253-5981. E-mail: ghoniem@mit.edu Preprint submitted to Combustion and Flame April 16, 2013 speed computed at the characteristic stretch rate captures the impact of different operating parameters on the combustor dynamics. These results suggest that the unsteady interactions between the turbulent flow and the flame dynamics can be encapsulated in the characteristic stretch rate, which governs the critical flame speed at the mode transitions and thereby plays an important role in determining the stability characteristics of the combustor.

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“…This will be caused by the curvature estimation only from twodimensional cross section in the experiments. It should be noted that curvature of the flame front has been reported by many previous studies [3,23], whereas all studies reported those in dimensional form or non-dimensionalized by laminar flame properties. In Fig.…”

Section: Resultsmentioning

confidence: 91%

“…Recently, simultaneous CH, OH and velocity measurement has been reported [19,20] for investigate the flame structures. Furthermore, to investigate the dynamics of turbulent premixed flame, CH doublepulsed PLIF measurement [21] and simultaneous CH double pulsed PLIF/OH PLIF and stereoscopic PIV measurement [22] and simultaneous stereo PIV and double-pulsed acetone PLIF [23] were developed. However, almost all studies were restricted to measurement in two-dimensional cross section.…”

Section: Introductionmentioning

confidence: 99%

Measurement of three-dimensional flame structure by combined laser diagnostics

et al. 2009

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To investigate three-dimensional flame structures of turbulent premixed flame experimentally, dual-plane planar laser induced fluorescence (PLIF) of CH radical has been developed. This dual-plane CH PLIF system consists of two independent conventional CH PLIF measurement systems and laser beam from each laser system are led to parallel optical pass using the difference of polarization, and CH PLIF is conducted in two parallel two-dimensional cross sections. The newly-developed dual-plane CH PLIF is combined with single-plane OH PLIF and stereoscopic particle image velocimetry (PIV) to clarify the relation between flame geometry and turbulence characteristics. The laser sheets for single-plane OH PLIF and stereoscopic PIV measurement are located at the center of two planes for CH PLIF. The separation between these two planes is selected to 500 µm. The measurement was conducted in relatively high Reynolds number methane-air turbulent jet premixed flame. The experimental results show that various three-dimensional flame structures such as the handgrip structure, which has been shown by three-dimensional direct numerical simulations (DNS), are included in high Reynolds number turbulent premixed flame. It was shown that the simultaneous measurement containing newly-developed dual-plane CH PLIF is useful for investigating the three-dimensional flame structures. To analyze the flame structures quantitatively, the flame curvature was estimated by using the CH and OH PLIF images, and the probability density function (pdf) of the curvatures was compared with the results of DNS. It was revealed that the minimum radius of curvature of the flame front coincides with Kolmogorov length. However, the feature of pdf of the flame curvature is slightly different from result of DNS, if the curvature was estimated from experimental results in two-dimensional cross section. On the other hand, the feature of pdf of mean curvature that calculated from triple-plane PLIF results is similar to that obtained from three-dimensional DNS.

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Simultaneous stereo particle image velocimetry and double-pulsed planar laser-induced fluorescence of turbulent premixed flames

Cited by 25 publications

References 27 publications

Large Eddy Simulation and PIV Measurements of Unsteady Premixed Flames Accelerated by Obstacles

Large Eddy Simulation and PIV Measurements of Unsteady Premixed Flames Accelerated by Obstacles

Examining flow-flame interaction and the characteristic stretch rate in vortex-driven combustion dynamics using PIV and numerical simulation

Measurement of three-dimensional flame structure by combined laser diagnostics

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