TY - JOUR
T1 - Differential diffusion effects in the near field of non-premixed NH3/H2/N2-air jet flames at elevated pressure
AU - Tang, Hao
AU - Yang, Chaobo
AU - Krishna, Yedhu
AU - Wang, Guoqing
AU - Roberts, William L.
AU - Guiberti, Thibault
AU - Magnotti, Gaetano
N1 - KAUST Repository Item: Exported on 2023-08-08
Acknowledgements: The research reported in this publication was funded by King Abdullah University of Science and Technology (KAUST).
PY - 2023/8/6
Y1 - 2023/8/6
N2 - Differential diffusion (diff-diff) effects are analyzed in both non-premixed laminar and turbulent NH3-H2-N2 jet flames at 5 bar using 1D quantitative Raman scattering measurements. The two target flames feature fuel compositions simulating a 14% and a 28% NH3 cracking ratio. A diff-diff parameter is introduced for ammonia combustion, analogous to the definition used for hydrocarbon flames. Measurements in laminar flames, compared to Chemkin simulation featuring multi-component transport show that the instrument is capable of measuring the mean diff-diff parameter, but that single-shot measurements are compromised by the large sensitivity of the parameter to errors in N2 and NH3 mass fractions. The analysis of the diff-diff parameter in turbulent flames shows that both flames have strong differential diffusion in the near field up to an axial distance of 10 diameters (Z/D = 10), then the turbulent mixing becomes dominant further downstream. The flame with a 28% NH3 cracking ratio exhibits a higher diff-diff parameter especially in the low-temperature region (
AB - Differential diffusion (diff-diff) effects are analyzed in both non-premixed laminar and turbulent NH3-H2-N2 jet flames at 5 bar using 1D quantitative Raman scattering measurements. The two target flames feature fuel compositions simulating a 14% and a 28% NH3 cracking ratio. A diff-diff parameter is introduced for ammonia combustion, analogous to the definition used for hydrocarbon flames. Measurements in laminar flames, compared to Chemkin simulation featuring multi-component transport show that the instrument is capable of measuring the mean diff-diff parameter, but that single-shot measurements are compromised by the large sensitivity of the parameter to errors in N2 and NH3 mass fractions. The analysis of the diff-diff parameter in turbulent flames shows that both flames have strong differential diffusion in the near field up to an axial distance of 10 diameters (Z/D = 10), then the turbulent mixing becomes dominant further downstream. The flame with a 28% NH3 cracking ratio exhibits a higher diff-diff parameter especially in the low-temperature region (
UR - http://hdl.handle.net/10754/693507
UR - https://linkinghub.elsevier.com/retrieve/pii/S0894177723001760
U2 - 10.1016/j.expthermflusci.2023.111020
DO - 10.1016/j.expthermflusci.2023.111020
M3 - Article
SN - 0894-1777
SP - 111020
JO - Experimental Thermal and Fluid Science
JF - Experimental Thermal and Fluid Science
ER -