Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Analysis of the Chemical Structure in a Nonpremixed H2/N2 Flame Using Large Eddy Simulation with Detailed Chemistry
T2 - 8th International Conference on Applied Energy, ICAE2016, 8-11 October 2016, Beijing, China
AU - Zhou, Xuejin
AU - Jiang, Xi
PY - 2017/5/1
Y1 - 2017/5/1
N2 - Abstract This paper presents numerical studies of flame structure in a well-known nonpremixed H2/N2 jet flame. A detailed kinetic mechanism is implemented to large eddy simulation approach with linear eddy model as subgrid closure method. The numerical techniques are validated against experimental data in temperature profiles, specie mass fractions and mixture fractions. Reaction rates are calculated at the flame base to investigate the dominant chemistry for a variety of conditions of fuel and coflow. The results show that the decrease of hydrogen concentration leads to chemical pathways changing at the flame base that is responsible for the autoignition. Oxygen content variation in the coflow affects the reaction rates but does not change the dominant chemistry. Furthermore, water addition to the coflow is found to enhance NOx formation by promoting radical production.
AB - Abstract This paper presents numerical studies of flame structure in a well-known nonpremixed H2/N2 jet flame. A detailed kinetic mechanism is implemented to large eddy simulation approach with linear eddy model as subgrid closure method. The numerical techniques are validated against experimental data in temperature profiles, specie mass fractions and mixture fractions. Reaction rates are calculated at the flame base to investigate the dominant chemistry for a variety of conditions of fuel and coflow. The results show that the decrease of hydrogen concentration leads to chemical pathways changing at the flame base that is responsible for the autoignition. Oxygen content variation in the coflow affects the reaction rates but does not change the dominant chemistry. Furthermore, water addition to the coflow is found to enhance NOx formation by promoting radical production.
KW - chemical structure
KW - hydrogen flame
KW - large eddy simulation
KW - detailed kinetic mechanism
KW - linear eddy model
U2 - 10.1016/j.egypro.2017.03.565
DO - 10.1016/j.egypro.2017.03.565
M3 - Journal article
VL - 105
SP - 1948
EP - 1952
JO - Energy Procedia
JF - Energy Procedia
SN - 1876-6102
ER -