Details
| Original language | English |
|---|---|
| Pages (from-to) | 2669-2677 |
| Number of pages | 9 |
| Journal | Proceedings of the Combustion Institute |
| Volume | 29 |
| Issue number | 2 |
| Publication status | Published - 2002 |
| Externally published | Yes |
| Event | 30th International Symposium on Combustion - Chicago, IL, United States Duration: 25 Jul 2004 → 30 Jul 2004 |
Abstract
In moderately and highly turbulent, premixed CH4/air flames, two-dimensional simultaneous measurements of instantaneous velocity, temperature, and density have been made using particle image velocimetry (PIV) and planar filtered Rayleigh scattering thermometry (FRS thermometry). The resulting joint data sets enable the direct determination of the Favre mean turbulent flux (FMTF), which is of high interest for combustion modeling. An evaluation strategy is given for the calculation of the FMTF using this joint temperature-velocity data. Measurements indicate the existence of countergradient transport in the highly turbulent bluff-body-stabilized flame, while in the wire-stabilized flame with moderate turbulence, the FMTF fluctuates around zero. Additionally, the direct FMTF determination was tested against other models of the turbulent flux using either a scalar gradient approach or binary conditioned velocity data, following the thin-flame approach of the Bray-Moss-Libby (BML) model. While only the latter shows good agreement with the direct FMTF determination. In the bluff-body-stabilized flame from the two-dimensional plots of the axial FMTF, regions with either dominant gradient diffusion or dominant countergradient diffusion can be identified within the same flame. This feasibility study outlines the potential of simultaneously applied FRS-PIV techniques for the direct determination of unclosed terms in the Favre mean balance equations.
ASJC Scopus subject areas
- Chemical Engineering(all)
- General Chemical Engineering
- Engineering(all)
- Mechanical Engineering
- Chemistry(all)
- Physical and Theoretical Chemistry
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In: Proceedings of the Combustion Institute, Vol. 29, No. 2, 2002, p. 2669-2677.
Research output: Contribution to journal › Conference article › Research › peer review
}
TY - JOUR
T1 - Direct determination of the turbulent flux by simultaneous application of filtered Rayleigh scattering thermometry and particle image velocimetry
AU - Most, Dieter
AU - Dinkelacker, Friedrich
AU - Leipertz, Alfred
N1 - Funding Information: The authors gratefully acknowledge financial support of the Deutsche Forschungsgemeinschaft.
PY - 2002
Y1 - 2002
N2 - In moderately and highly turbulent, premixed CH4/air flames, two-dimensional simultaneous measurements of instantaneous velocity, temperature, and density have been made using particle image velocimetry (PIV) and planar filtered Rayleigh scattering thermometry (FRS thermometry). The resulting joint data sets enable the direct determination of the Favre mean turbulent flux (FMTF), which is of high interest for combustion modeling. An evaluation strategy is given for the calculation of the FMTF using this joint temperature-velocity data. Measurements indicate the existence of countergradient transport in the highly turbulent bluff-body-stabilized flame, while in the wire-stabilized flame with moderate turbulence, the FMTF fluctuates around zero. Additionally, the direct FMTF determination was tested against other models of the turbulent flux using either a scalar gradient approach or binary conditioned velocity data, following the thin-flame approach of the Bray-Moss-Libby (BML) model. While only the latter shows good agreement with the direct FMTF determination. In the bluff-body-stabilized flame from the two-dimensional plots of the axial FMTF, regions with either dominant gradient diffusion or dominant countergradient diffusion can be identified within the same flame. This feasibility study outlines the potential of simultaneously applied FRS-PIV techniques for the direct determination of unclosed terms in the Favre mean balance equations.
AB - In moderately and highly turbulent, premixed CH4/air flames, two-dimensional simultaneous measurements of instantaneous velocity, temperature, and density have been made using particle image velocimetry (PIV) and planar filtered Rayleigh scattering thermometry (FRS thermometry). The resulting joint data sets enable the direct determination of the Favre mean turbulent flux (FMTF), which is of high interest for combustion modeling. An evaluation strategy is given for the calculation of the FMTF using this joint temperature-velocity data. Measurements indicate the existence of countergradient transport in the highly turbulent bluff-body-stabilized flame, while in the wire-stabilized flame with moderate turbulence, the FMTF fluctuates around zero. Additionally, the direct FMTF determination was tested against other models of the turbulent flux using either a scalar gradient approach or binary conditioned velocity data, following the thin-flame approach of the Bray-Moss-Libby (BML) model. While only the latter shows good agreement with the direct FMTF determination. In the bluff-body-stabilized flame from the two-dimensional plots of the axial FMTF, regions with either dominant gradient diffusion or dominant countergradient diffusion can be identified within the same flame. This feasibility study outlines the potential of simultaneously applied FRS-PIV techniques for the direct determination of unclosed terms in the Favre mean balance equations.
UR - http://www.scopus.com/inward/record.url?scp=0037964814&partnerID=8YFLogxK
U2 - 10.1016/s1540-7489(02)80325-x
DO - 10.1016/s1540-7489(02)80325-x
M3 - Conference article
AN - SCOPUS:0037964814
VL - 29
SP - 2669
EP - 2677
JO - Proceedings of the Combustion Institute
JF - Proceedings of the Combustion Institute
SN - 1540-7489
IS - 2
T2 - 30th International Symposium on Combustion
Y2 - 25 July 2004 through 30 July 2004
ER -