Soot and spectral radiation modeling for a high-Pressure turbulent spray flame

S. Ferreyro Fernandez, C. Paul, A. Sircar, A. Imren, Daniel Connell Haworth, S. Roy, M. F. Modest

Research output: Contribution to conferencePaper

Abstract

Simulations are performed of a transient high-pressure turbulent n-dodecane spray flame under engine-relevant conditions. An unsteady RANS formulation is used, with detailed chemistry, a semi-empirical two-equation soot model, and a particle-based transported composition probability density function (PDF) method to account for unresolved turbulent fluctuations in composition and temperature. Results from the PDF model are compared with those from a locally well-stirred reactor (WSR) model to quantify the effects of turbulence-chemistry-soot interactions. Computed liquid and vapor penetration versus time, ignition delay, and flame lift-off height are in good agreement with experiment, and relatively small differences are seen between the WSR and PDF models for these global quantities. Computed soot levels and spatial soot distributions from the WSR and PDF models show large differences, with PDF results being in better agreement with experimental measurements. An uncoupled photon Monte Carlo method with line-by-line spectral resolution is used to compute the spectral intensity distribution of the radiation leaving the flame. This provides new insight into the relative importance of molecular gas radiation versus soot radiation, and the importance of turbulent fluctuations on radiative heat transfer.

Original languageEnglish (US)
StatePublished - Jan 1 2017
Event10th U.S. National Combustion Meeting - College Park, United States
Duration: Apr 23 2017Apr 26 2017

Other

Other10th U.S. National Combustion Meeting
CountryUnited States
CityCollege Park
Period4/23/174/26/17

Fingerprint

Soot
soot
probability density functions
Probability density function
sprayers
flames
Radiation
radiation
reactors
chemistry
transient pressures
radiative heat transfer
Spectral resolution
molecular gases
Chemical analysis
spectral resolution
ignition
Monte Carlo method
Ignition
engines

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Physical and Theoretical Chemistry
  • Mechanical Engineering

Cite this

Ferreyro Fernandez, S., Paul, C., Sircar, A., Imren, A., Haworth, D. C., Roy, S., & Modest, M. F. (2017). Soot and spectral radiation modeling for a high-Pressure turbulent spray flame. Paper presented at 10th U.S. National Combustion Meeting, College Park, United States.
Ferreyro Fernandez, S. ; Paul, C. ; Sircar, A. ; Imren, A. ; Haworth, Daniel Connell ; Roy, S. ; Modest, M. F. / Soot and spectral radiation modeling for a high-Pressure turbulent spray flame. Paper presented at 10th U.S. National Combustion Meeting, College Park, United States.
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Ferreyro Fernandez, S, Paul, C, Sircar, A, Imren, A, Haworth, DC, Roy, S & Modest, MF 2017, 'Soot and spectral radiation modeling for a high-Pressure turbulent spray flame', Paper presented at 10th U.S. National Combustion Meeting, College Park, United States, 4/23/17 - 4/26/17.

Soot and spectral radiation modeling for a high-Pressure turbulent spray flame. / Ferreyro Fernandez, S.; Paul, C.; Sircar, A.; Imren, A.; Haworth, Daniel Connell; Roy, S.; Modest, M. F.

2017. Paper presented at 10th U.S. National Combustion Meeting, College Park, United States.

Research output: Contribution to conferencePaper

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T1 - Soot and spectral radiation modeling for a high-Pressure turbulent spray flame

AU - Ferreyro Fernandez, S.

AU - Paul, C.

AU - Sircar, A.

AU - Imren, A.

AU - Haworth, Daniel Connell

AU - Roy, S.

AU - Modest, M. F.

PY - 2017/1/1

Y1 - 2017/1/1

N2 - Simulations are performed of a transient high-pressure turbulent n-dodecane spray flame under engine-relevant conditions. An unsteady RANS formulation is used, with detailed chemistry, a semi-empirical two-equation soot model, and a particle-based transported composition probability density function (PDF) method to account for unresolved turbulent fluctuations in composition and temperature. Results from the PDF model are compared with those from a locally well-stirred reactor (WSR) model to quantify the effects of turbulence-chemistry-soot interactions. Computed liquid and vapor penetration versus time, ignition delay, and flame lift-off height are in good agreement with experiment, and relatively small differences are seen between the WSR and PDF models for these global quantities. Computed soot levels and spatial soot distributions from the WSR and PDF models show large differences, with PDF results being in better agreement with experimental measurements. An uncoupled photon Monte Carlo method with line-by-line spectral resolution is used to compute the spectral intensity distribution of the radiation leaving the flame. This provides new insight into the relative importance of molecular gas radiation versus soot radiation, and the importance of turbulent fluctuations on radiative heat transfer.

AB - Simulations are performed of a transient high-pressure turbulent n-dodecane spray flame under engine-relevant conditions. An unsteady RANS formulation is used, with detailed chemistry, a semi-empirical two-equation soot model, and a particle-based transported composition probability density function (PDF) method to account for unresolved turbulent fluctuations in composition and temperature. Results from the PDF model are compared with those from a locally well-stirred reactor (WSR) model to quantify the effects of turbulence-chemistry-soot interactions. Computed liquid and vapor penetration versus time, ignition delay, and flame lift-off height are in good agreement with experiment, and relatively small differences are seen between the WSR and PDF models for these global quantities. Computed soot levels and spatial soot distributions from the WSR and PDF models show large differences, with PDF results being in better agreement with experimental measurements. An uncoupled photon Monte Carlo method with line-by-line spectral resolution is used to compute the spectral intensity distribution of the radiation leaving the flame. This provides new insight into the relative importance of molecular gas radiation versus soot radiation, and the importance of turbulent fluctuations on radiative heat transfer.

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Ferreyro Fernandez S, Paul C, Sircar A, Imren A, Haworth DC, Roy S et al. Soot and spectral radiation modeling for a high-Pressure turbulent spray flame. 2017. Paper presented at 10th U.S. National Combustion Meeting, College Park, United States.