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Title: Structure of a stratified CH 4 flame with H 2 addition

Abstract

To explore the effect of H 2 addition (20 percent by volume) on stratified-premixed methane combustion in a turbulent flow, an experimental investigation on a new flame configuration of the Darmstadt stratified burner is conducted here. Major species concentrations and temperature are measured with high spatial resolution by 1D Raman-Rayleigh scattering. A conditioning on local equivalence ratio (range from φ = 0.45 to φ = 1.25) and local stratification is applied to the large dataset and allows to analyze the impact of H 2 addition on the flame structure. The local stratification level is determined as Δφ/ΔT at the location of maximum CO mass fraction for each instantaneous flame realization. Due to the H 2 addition, preferential diffusion of H 2 is different than in pure methane flames. In addition to diffusing out of the reaction zone where it is formed, particularly in rich conditions, H 2 also diffuses from the cold reactant mixture into the flame front. For rich conditions (φ = 1.05 to φ = 1.15) H 2 mass fractions are significantly elevated within the intermediate temperature range compared to fully-premixed laminar flame simulations. This elevation is attributed to preferential transport of H 2 into the rich flamemore » front from adjacent even richer regions of the flow. Additionally, when the local stratification across the flame front is taken into account, it is revealed that the state-space relation of H 2 is not only a function of the local stoichiometry but also the local stratification level. In these flames H 2 is the only major species showing sensitivity of the state-space relation to an equivalence ratio gradient across the flame front.« less

Authors:
 [1];  [2]; ORCiD logo [3];  [4]; ORCiD logo [5];  [1]
  1. TU Darmstadt (Germany). Dept. of Reactive Flows and Measurement Technology
  2. Darmstadt Univ. of Applied Sciences (Germany)
  3. King Abdullah Univ. of Science and Technology, Thuwal (Saudi Arabia). Clean Combustion Research Center
  4. Univ. of Sydney, NSW (Australia). The School of Aeronautical, Mechanical and Mechatronic Engineering
  5. Sandia National Lab. (SNL-CA), Livermore, CA (United States). Reacting Flow Research Dept.
Publication Date:
Research Org.:
Sandia National Lab. (SNL-CA), Livermore, CA (United States); Darmstadt Univ. of Applied Sciences (Germany); TU Darmstadt (Germany)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE National Nuclear Security Administration (NNSA); German Research Foundation (DFG)
OSTI Identifier:
1497651
Report Number(s):
SAND-2017-13162J
Journal ID: ISSN 1540-7489; 672180
Grant/Contract Number:  
NA0003525; DR 374/13; GE 2523/1
Resource Type:
Journal Article: 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; 42 ENGINEERING; turbulent combustion; H2 addition; stratified flames; multiple conditioned data analysis; Raman/Rayleigh scattering

Citation Formats

Schneider, Silvan, Geyer, Dirk, Magnotti, Gaetano, Dunn, Matthew J., Barlow, Robert S., and Dreizler, Andreas. Structure of a stratified CH4 flame with H2 addition. United States: N. p., 2018. Web. doi:10.1016/j.proci.2018.06.205.
Schneider, Silvan, Geyer, Dirk, Magnotti, Gaetano, Dunn, Matthew J., Barlow, Robert S., & Dreizler, Andreas. Structure of a stratified CH4 flame with H2 addition. United States. https://doi.org/10.1016/j.proci.2018.06.205
Schneider, Silvan, Geyer, Dirk, Magnotti, Gaetano, Dunn, Matthew J., Barlow, Robert S., and Dreizler, Andreas. Wed . "Structure of a stratified CH4 flame with H2 addition". United States. https://doi.org/10.1016/j.proci.2018.06.205. https://www.osti.gov/servlets/purl/1497651.
@article{osti_1497651,
title = {Structure of a stratified CH4 flame with H2 addition},
author = {Schneider, Silvan and Geyer, Dirk and Magnotti, Gaetano and Dunn, Matthew J. and Barlow, Robert S. and Dreizler, Andreas},
abstractNote = {To explore the effect of H2 addition (20 percent by volume) on stratified-premixed methane combustion in a turbulent flow, an experimental investigation on a new flame configuration of the Darmstadt stratified burner is conducted here. Major species concentrations and temperature are measured with high spatial resolution by 1D Raman-Rayleigh scattering. A conditioning on local equivalence ratio (range from φ = 0.45 to φ = 1.25) and local stratification is applied to the large dataset and allows to analyze the impact of H2 addition on the flame structure. The local stratification level is determined as Δφ/ΔT at the location of maximum CO mass fraction for each instantaneous flame realization. Due to the H2 addition, preferential diffusion of H2 is different than in pure methane flames. In addition to diffusing out of the reaction zone where it is formed, particularly in rich conditions, H2 also diffuses from the cold reactant mixture into the flame front. For rich conditions (φ = 1.05 to φ = 1.15) H2 mass fractions are significantly elevated within the intermediate temperature range compared to fully-premixed laminar flame simulations. This elevation is attributed to preferential transport of H2 into the rich flame front from adjacent even richer regions of the flow. Additionally, when the local stratification across the flame front is taken into account, it is revealed that the state-space relation of H2 is not only a function of the local stoichiometry but also the local stratification level. In these flames H2 is the only major species showing sensitivity of the state-space relation to an equivalence ratio gradient across the flame front.},
doi = {10.1016/j.proci.2018.06.205},
url = {https://www.osti.gov/biblio/1497651}, journal = {Proceedings of the Combustion Institute},
issn = {1540-7489},
number = 2,
volume = 37,
place = {United States},
year = {2018},
month = {9}
}

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