Details
| Original language | English |
|---|---|
| Pages (from-to) | 366-378 |
| Number of pages | 13 |
| Journal | Fuel |
| Volume | 224 |
| Early online date | 20 Mar 2018 |
| Publication status | Published - 15 Jul 2018 |
Abstract
Ammonia shows a promising potential to be a carbon-free and sustainable fuel for gas turbines and internal combustion engines. The design of such complex combustion systems using computational reactive fluid dynamics in combination with detailed reaction mechanisms is a time-consuming challenge. Combustion models are a solution to reduce the computation time, but require data of fundamental laminar flame characteristics. In order to provide such data, in this present study correlations of laminar flame speed and flame thickness for ammonia/hydrogen/nitrogen/air mixtures based on a prior selected detailed reaction mechanism were developed. A validation study for three detailed chemical schemes was conducted using experimentally obtained laminar flame speed data from literature to determine one mechanism with the best predictive capabilities. A database with 222250 data entries of laminar flame speed and flame thickness was generated by performing numerical one-dimensional simulations using the selected mechanism. From that correlations were derived. The database as well as the derived correlations contain a broad range of initial conditions: air/fuel equivalence ratio: (0.5–1.7), ammonia: (0–100) mol%, hydrogen addition: (0–60) mol%, nitrogen addition: (0–20) mol%, fresh gas temperatures: (300–1100) K and pressures: (0.1–25) MPa. For the substitution of fuel within existing burners or engines which so far are operated with methane, it is of special interest, if a defined ammonia/hydrogen/nitrogen/air mixture could be used with similar properties. For that it is shown that such a mixture composition can be found which has a similar laminar flame speed than methane, depending on the given initial conditions.
Keywords
- Ammonia, Correlation, Flame thickness, Hydrogen, Laminar flame speed, Sustainable fuel
ASJC Scopus subject areas
- Chemical Engineering(all)
- General Chemical Engineering
- Energy(all)
- Fuel Technology
- Energy(all)
- Energy Engineering and Power Technology
- Chemistry(all)
- Organic Chemistry
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In: Fuel, Vol. 224, 15.07.2018, p. 366-378.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Approximation of laminar flame characteristics on premixed ammonia/hydrogen/nitrogen/air mixtures at elevated temperatures and pressures
AU - Goldmann, Andreas
AU - Dinkelacker, Friedrich
N1 - Funding Information: This research was supported by Lower Saxonian Ministry for Science and Culture as part of the research program MOBILISE – Mobility in Engineering and Science . The authors thanks Olivier Mathieu and Zhenyu Tian for providing their files of their detailed reaction mechanisms for this study.
PY - 2018/7/15
Y1 - 2018/7/15
N2 - Ammonia shows a promising potential to be a carbon-free and sustainable fuel for gas turbines and internal combustion engines. The design of such complex combustion systems using computational reactive fluid dynamics in combination with detailed reaction mechanisms is a time-consuming challenge. Combustion models are a solution to reduce the computation time, but require data of fundamental laminar flame characteristics. In order to provide such data, in this present study correlations of laminar flame speed and flame thickness for ammonia/hydrogen/nitrogen/air mixtures based on a prior selected detailed reaction mechanism were developed. A validation study for three detailed chemical schemes was conducted using experimentally obtained laminar flame speed data from literature to determine one mechanism with the best predictive capabilities. A database with 222250 data entries of laminar flame speed and flame thickness was generated by performing numerical one-dimensional simulations using the selected mechanism. From that correlations were derived. The database as well as the derived correlations contain a broad range of initial conditions: air/fuel equivalence ratio: (0.5–1.7), ammonia: (0–100) mol%, hydrogen addition: (0–60) mol%, nitrogen addition: (0–20) mol%, fresh gas temperatures: (300–1100) K and pressures: (0.1–25) MPa. For the substitution of fuel within existing burners or engines which so far are operated with methane, it is of special interest, if a defined ammonia/hydrogen/nitrogen/air mixture could be used with similar properties. For that it is shown that such a mixture composition can be found which has a similar laminar flame speed than methane, depending on the given initial conditions.
AB - Ammonia shows a promising potential to be a carbon-free and sustainable fuel for gas turbines and internal combustion engines. The design of such complex combustion systems using computational reactive fluid dynamics in combination with detailed reaction mechanisms is a time-consuming challenge. Combustion models are a solution to reduce the computation time, but require data of fundamental laminar flame characteristics. In order to provide such data, in this present study correlations of laminar flame speed and flame thickness for ammonia/hydrogen/nitrogen/air mixtures based on a prior selected detailed reaction mechanism were developed. A validation study for three detailed chemical schemes was conducted using experimentally obtained laminar flame speed data from literature to determine one mechanism with the best predictive capabilities. A database with 222250 data entries of laminar flame speed and flame thickness was generated by performing numerical one-dimensional simulations using the selected mechanism. From that correlations were derived. The database as well as the derived correlations contain a broad range of initial conditions: air/fuel equivalence ratio: (0.5–1.7), ammonia: (0–100) mol%, hydrogen addition: (0–60) mol%, nitrogen addition: (0–20) mol%, fresh gas temperatures: (300–1100) K and pressures: (0.1–25) MPa. For the substitution of fuel within existing burners or engines which so far are operated with methane, it is of special interest, if a defined ammonia/hydrogen/nitrogen/air mixture could be used with similar properties. For that it is shown that such a mixture composition can be found which has a similar laminar flame speed than methane, depending on the given initial conditions.
KW - Ammonia
KW - Correlation
KW - Flame thickness
KW - Hydrogen
KW - Laminar flame speed
KW - Sustainable fuel
UR - http://www.scopus.com/inward/record.url?scp=85044072471&partnerID=8YFLogxK
U2 - 10.1016/j.fuel.2018.03.030
DO - 10.1016/j.fuel.2018.03.030
M3 - Article
AN - SCOPUS:85044072471
VL - 224
SP - 366
EP - 378
JO - Fuel
JF - Fuel
SN - 0016-2361
ER -