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Title: Assessing the relative importance of flame regimes in Raman/Rayleigh line measurements of turbulent lifted flames

Abstract

Understanding and quantifying the relative importance of premixed and non-premixed reaction zones within turbulent partially premixed flames is an important issue for multi-regime combustion. The recently-developed method of gradient-free regime identification (GFRI) is applied to instantaneous 1D Raman/Rayleigh measurements of temperature and major species from two turbulent lifted methane/air flames. Local premixed and non-premixed reaction zones are identified using criteria based on the mixture fraction, the chemical explosive mode, and the heat release rate, the latter two being calculated from an approximation of the full thermochemical state of each measured sample. A chemical mode (CM) zero-crossing is a previously documented marker for a premixed reaction zone. Results from the lifted flames show strong correlations among the mixture fraction at the CM zero-crossing, the magnitude of the change in CM at the zero-crossing, and the local heat release rate at the CM zero-crossing compared to the maximum heat release rate. The trends are confirmed through a comparable analysis of numerical simulations of two laminar triple flames. These newly documented trends are associated with the transition from dominantly premixed flame structures to dominantly non-premixed flames structures. The methods introduced for assessing the relative importance of local premixed and non-premixed reactions zones havemore » potential for application to a broad range of turbulent flames.« less

Authors:
 [1];  [2];  [3];  [4]; ORCiD logo [5]; ORCiD logo [6]; ORCiD logo [7]
  1. Univ. of Applied Sciences, Darmstadt (Germany). Thermodynamics and Alternative Propulsion Systems; TU Darmstadt (Germany). FG Simulation of Reactive Thermo-Fluid Systems
  2. Univ. of the Pacific, Stockton, CA (United States)
  3. Univ. of Applied Sciences, Darmstadt (Germany). Thermodynamics and Alternative Propulsion Systems
  4. TU Darmstadt (Germany). FG Reactive Flows and Diagnostics. Center of Smart Interfaces
  5. Sandia National Lab. (SNL-CA), Livermore, CA (United States). Combustion Research Facility; King Abdullah Univ. of Science and Technology, Thuwal (Saudi Arabia). Clean Combustion Research Center
  6. TU Darmstadt (Germany). FG Simulation of Reactive Thermo-Fluid Systems
  7. Sandia National Lab. (SNL-CA), Livermore, CA (United States). Combustion Research Facility
Publication Date:
Research Org.:
Sandia National Lab. (SNL-CA), Livermore, CA (United States); Univ. of Applied Sciences, Darmstadt (Germany); TU Darmstadt (Germany)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE Office of Science (SC), Workforce Development for Teachers and Scientists (WDTS) (SC-27); German Research Foundation (DFG)
OSTI Identifier:
1497649
Report Number(s):
SAND2017-13160J
Journal ID: ISSN 1540-7489; 672178
Grant/Contract Number:  
NA0003525; DR 374/15-1; DR 374/18-1; GE 2523/3-1; HA 4367/5-1
Resource Type:
Accepted Manuscript
Journal Name:
Proceedings of the Combustion Institute
Additional Journal Information:
Journal Volume: 37; Journal Issue: 2; Journal ID: ISSN 1540-7489
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; GFRI; combustion regime; heat release rate; CEMA; Raman/Rayleigh

Citation Formats

Hartl, S., Van Winkle, R., Geyer, D., Dreizler, A., Magnotti, G., Hasse, C., and Barlow, R. S. Assessing the relative importance of flame regimes in Raman/Rayleigh line measurements of turbulent lifted flames. United States: N. p., 2018. Web. doi:10.1016/j.proci.2018.06.067.
Hartl, S., Van Winkle, R., Geyer, D., Dreizler, A., Magnotti, G., Hasse, C., & Barlow, R. S. Assessing the relative importance of flame regimes in Raman/Rayleigh line measurements of turbulent lifted flames. United States. doi:10.1016/j.proci.2018.06.067.
Hartl, S., Van Winkle, R., Geyer, D., Dreizler, A., Magnotti, G., Hasse, C., and Barlow, R. S. Fri . "Assessing the relative importance of flame regimes in Raman/Rayleigh line measurements of turbulent lifted flames". United States. doi:10.1016/j.proci.2018.06.067. https://www.osti.gov/servlets/purl/1497649.
@article{osti_1497649,
title = {Assessing the relative importance of flame regimes in Raman/Rayleigh line measurements of turbulent lifted flames},
author = {Hartl, S. and Van Winkle, R. and Geyer, D. and Dreizler, A. and Magnotti, G. and Hasse, C. and Barlow, R. S.},
abstractNote = {Understanding and quantifying the relative importance of premixed and non-premixed reaction zones within turbulent partially premixed flames is an important issue for multi-regime combustion. The recently-developed method of gradient-free regime identification (GFRI) is applied to instantaneous 1D Raman/Rayleigh measurements of temperature and major species from two turbulent lifted methane/air flames. Local premixed and non-premixed reaction zones are identified using criteria based on the mixture fraction, the chemical explosive mode, and the heat release rate, the latter two being calculated from an approximation of the full thermochemical state of each measured sample. A chemical mode (CM) zero-crossing is a previously documented marker for a premixed reaction zone. Results from the lifted flames show strong correlations among the mixture fraction at the CM zero-crossing, the magnitude of the change in CM at the zero-crossing, and the local heat release rate at the CM zero-crossing compared to the maximum heat release rate. The trends are confirmed through a comparable analysis of numerical simulations of two laminar triple flames. These newly documented trends are associated with the transition from dominantly premixed flame structures to dominantly non-premixed flames structures. The methods introduced for assessing the relative importance of local premixed and non-premixed reactions zones have potential for application to a broad range of turbulent flames.},
doi = {10.1016/j.proci.2018.06.067},
journal = {Proceedings of the Combustion Institute},
number = 2,
volume = 37,
place = {United States},
year = {2018},
month = {7}
}

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