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Title: Stabilization of piloted turbulent flames with inhomogeneous inlets

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Publication Date:
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Proceedings of the Combustion Institute
Additional Journal Information:
Journal Volume: 35; Journal Issue: 2; Related Information: CHORUS Timestamp: 2017-05-17 09:40:28; Journal ID: ISSN 1540-7489
Country of Publication:
United States

Citation Formats

Meares, S., Prasad, V. N., Magnotti, G., Barlow, R. S., and Masri, A. R. Stabilization of piloted turbulent flames with inhomogeneous inlets. United States: N. p., 2015. Web. doi:10.1016/j.proci.2014.05.071.
Meares, S., Prasad, V. N., Magnotti, G., Barlow, R. S., & Masri, A. R. Stabilization of piloted turbulent flames with inhomogeneous inlets. United States. doi:10.1016/j.proci.2014.05.071.
Meares, S., Prasad, V. N., Magnotti, G., Barlow, R. S., and Masri, A. R. 2015. "Stabilization of piloted turbulent flames with inhomogeneous inlets". United States. doi:10.1016/j.proci.2014.05.071.
title = {Stabilization of piloted turbulent flames with inhomogeneous inlets},
author = {Meares, S. and Prasad, V. N. and Magnotti, G. and Barlow, R. S. and Masri, A. R.},
abstractNote = {},
doi = {10.1016/j.proci.2014.05.071},
journal = {Proceedings of the Combustion Institute},
number = 2,
volume = 35,
place = {United States},
year = 2015,
month = 1

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.proci.2014.05.071

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Cited by: 19works
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  • Cited by 3
  • Temperature fluctuations have been measured in a turbulent, natural gas-fueled, piloted jet diffusion flame with a fuel jet exit Reynolds number of 9,700, using broadband Coherent Anti-Stokes Raman Spectroscopy (CARS) nitrogen thermometry with a best spatial resolution of 0.9 mm. Radial profiles of mean temperature and root mean square (rms) temperature fluctuations have been acquired and temperature probability density functions (pdfs) have been constructed for streamwide distances in the range 4.2 {le} x/d {le} 66.7. Comparison with thermocouple measurements shows very good agreement in regions of moderate temperature gradients, whereas in the steeper gradient jet flank areas spatial averaging leadsmore » to CARS mean temperatures lower by as much as 60 K for x/d {ge} 25 and by 150 K for x/d = 8.3. Comparison with numerical predictions that employ a {kappa}-{epsilon} model for turbulence and a constrained equilibrium model for chemistry along with a presumed pdf shape for the mixture fraction, shows very good agreement, for x/d {ge} 16.7, between computed and measured peak and centerline mean temperatures and rms temperature fluctuations, and fair agreement for x/d = 8.3. The thermal jet widths are underpredicted for x/d {ge} 25. Measured pdfs attain a variety of shapes, from nearly symmetric around the centerline and bimodal near the average reaction zone location, to nearly uniform in parts of the jet flanks and, finally, to triangular at the jet tails. In addition, measured centerline pdfs evolve from triangular to nearly Gaussian as x/d increases. The agreement between predicted and measured pdf shapes is excellent at the centerline and is very good in other parts of the jet flame.« less
  • A velocity-composition joint pdf transport equation has been solved by the Monte Carlo method to calculate the structure of pilot-stabilized turbulent nonpremixed flames of methane. Three components of velocity and a conserved scalar, namely, mixture fraction, {xi} are jointly represented in the pdf. A new model is used for turbulent frequency. Turbulent dissipation and the fluctuating pressure gradient terms are conditionally modeled. Two simple models for thermochemistry are used. In one, density is a piecewise function of {xi}, and in the other, density is obtained from calculations of a laminar counterflow diffusion flame of methane with a stretch rate, amore » = 100 s{sup {minus}1}. Calculations are compared with the corresponding experimental measurements performed on a number of flames ranging from flames with low mixing rates to ones close to extinction. The velocity, turbulence, and mixing fields are predicted with reasonable accuracy down to {chi}/D{sub j} {approximately} 30.« less
  • Numerical simulation results are presented for two axisymmetric, nonluminous turbulent piloted jet diffusion flames: Sandia Flame D (SFD) and Delft Flame III (DFIII). Turbulence is represented by a Reynolds stress transport model, while chemistry is modeled by means of steady laminar flamelets. We use the preassumed PDF approach for turbulence-chemistry interaction. A weighted sum of gray gases model is used for the gas radiative properties. The radiative transfer equation is solved using the discrete ordinates method in the conservative finite-volume formulation. The radiative loss leads to a decrease in mean temperature, but does not significantly influence the flow and mixingmore » fields, in terms either of mean values or of rms values of fluctuations. A systematic analysis of turbulence-radiation interaction (TRI) is carried out. By considering five different TRI formulations, and comparing also with a simple optically thin model, individual TRI contributions are isolated and quantified. For both flames, effects are demonstrated of (1) influence of temperature fluctuations on the mean Planck function, (2) temperature and composition fluctuations on the mean absorption coefficient, and (3) correlation between absorption coefficient and Planck function. The strength of the last effect is stronger in DFIII than in SFD, because of stronger turbulence-chemistry interaction and lower mean temperature in DFIII. The impact of the choice of TRI model on the prediction of the temperature-sensitive minor species NO is determined in a postprocessing step with fixed flow and mixing fields. Best agreement for NO is obtained using the most complete representation of TRI. (author)« less