TY - JOUR
T1 - An experimental and numerical investigation to characterize the low-temperature heat release in stoichiometric and lean combustion
AU - Waqas, Muhammad
AU - Cheng, Song
AU - Goldsborough, S. Scott
AU - Rockstroh, Toby
AU - Johansson, Bengt
AU - Kolodziej, Christopher P.
N1 - Funding Information:
The submitted manuscript has been created in part by UChicago Argonne, LLC, Operator of Argonne National Laboratory (?Argonne?). Argonne, a U.S. Department of Energy Office of Science laboratory, is operated under Contract No. DE-AC02-06CH11357. The U.S. Government retains for itself, and others acting on its behalf, a paid-up nonexclusive, irrevocable worldwide license in said article to reproduce, prepare derivative works, distribute copies to the public, and perform publicly and display publicly, by or on behalf of the Government. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan. http://energy.gov/downloads/doe-public-access-plan. This work is performed under the auspices of the Office of Energy Efficiency and Renewable Energy, Office of Vehicle Technology, U.S. Department of Energy, under contract number DE-AC02-06CH11357, as part of the Co-Optimization of Fuels & Engines (Co-Optima).
Funding Information:
The submitted manuscript has been created in part by UChicago Argonne, LLC, Operator of Argonne National Laboratory (“Argonne”). Argonne, a U.S. Department of Energy Office of Science laboratory, is operated under Contract No. DE-AC02-06CH11357 . The U.S. Government retains for itself, and others acting on its behalf, a paid-up nonexclusive, irrevocable worldwide license in said article to reproduce, prepare derivative works, distribute copies to the public, and perform publicly and display publicly, by or on behalf of the Government. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan. http://energy.gov/downloads/doe-public-access-plan . This work is performed under the auspices of the Office of Energy Efficiency and Renewable Energy, Office of Vehicle Technology, U.S. Department of Energy, under contract number DE-AC02-06CH11357, as part of the Co-Optimization of Fuels & Engines (Co-Optima).
PY - 2021/1
Y1 - 2021/1
N2 - The low-temperature heat release (LTHR) characteristics of three RON 90 binary fuel blends (n-heptane blended with isooctane, toluene and ethanol) under lean and stoichiometric conditions that are representative of homogeneous charge compression ignition and spark-ignition end-gas combustion conditions, respectively, were studied using Cooperative Fuel Research (CFR) engine experiments as well as kinetic simulations. The end-gas temperature-pressure (T-P) trajectories were analyzed to identify the intake conditions leading to similar T-P trajectories between the two lambdas for each fuel blend. A heat release analysis was then conducted for the identified cases, where fuel-to-fuel differences in LTHR were identified and found to be sensitive to the operating condition. Simulations were conducted for these cases using a recently updated chemical kinetic model and a 0-D engine model, where good qualitative and reasonable quantitative agreements in LTHR were obtained. Sensitivity analysis was also performed directly on the rates of LTHR to understand the controlling chemical reactions of LTHR, providing further insights into the fuel-to-fuel differences. The results showed a significant promoting effect of n-heptane on LTHR rates, while inhibiting effects were observed for ethanol and toluene. Also highlighted was the importance of H-atom abstraction reactions from the chemistry of each fuel component, which could lead to contradictory fuel behavior depending on the locations of the H site of the abstraction reaction due to the different ensuing pathways for the primary fuel radicals.
AB - The low-temperature heat release (LTHR) characteristics of three RON 90 binary fuel blends (n-heptane blended with isooctane, toluene and ethanol) under lean and stoichiometric conditions that are representative of homogeneous charge compression ignition and spark-ignition end-gas combustion conditions, respectively, were studied using Cooperative Fuel Research (CFR) engine experiments as well as kinetic simulations. The end-gas temperature-pressure (T-P) trajectories were analyzed to identify the intake conditions leading to similar T-P trajectories between the two lambdas for each fuel blend. A heat release analysis was then conducted for the identified cases, where fuel-to-fuel differences in LTHR were identified and found to be sensitive to the operating condition. Simulations were conducted for these cases using a recently updated chemical kinetic model and a 0-D engine model, where good qualitative and reasonable quantitative agreements in LTHR were obtained. Sensitivity analysis was also performed directly on the rates of LTHR to understand the controlling chemical reactions of LTHR, providing further insights into the fuel-to-fuel differences. The results showed a significant promoting effect of n-heptane on LTHR rates, while inhibiting effects were observed for ethanol and toluene. Also highlighted was the importance of H-atom abstraction reactions from the chemistry of each fuel component, which could lead to contradictory fuel behavior depending on the locations of the H site of the abstraction reaction due to the different ensuing pathways for the primary fuel radicals.
KW - LTHR
KW - RON 90 binary blends
KW - Sensitivity analysis
UR - http://www.scopus.com/inward/record.url?scp=85092012543&partnerID=8YFLogxK
U2 - 10.1016/j.proci.2020.07.146
DO - 10.1016/j.proci.2020.07.146
M3 - Journal article
AN - SCOPUS:85092012543
SN - 1540-7489
VL - 38
SP - 6221
EP - 6230
JO - Proceedings of the Combustion Institute
JF - Proceedings of the Combustion Institute
IS - 4
T2 - 38th International Symposium on Combustion, 2021
Y2 - 24 January 2021 through 29 January 2021
ER -