TY - JOUR
T1 - Scalar structure in turbulent non-premixed NH3/H2/N2 jet flames at elevated pressure using Raman spectroscopy
AU - Tang, Hao
AU - Yang, Chaobo
AU - Wang, Guoqing
AU - Krishna, Yedhu
AU - Guiberti, Thibault
AU - Roberts, William L.
AU - Magnotti, Gaetano
N1 - KAUST Repository Item: Exported on 2022-09-14
Acknowledged KAUST grant number(s): BAS/1/1388-01-01, URF/1/3715-01-01
Acknowledgements: This publication is based upon work supported by the King Abdullah University of Science and Technology (KAUST) Research Funding Office under Award No. URF/1/3715-01-01 and BAS/1/1388-01-01
PY - 2022/7/21
Y1 - 2022/7/21
N2 - This work presents the first quantitative Raman measurements of temperature, mass fractions, and mixture fractions in two turbulent ammonia/hydrogen/nitrogen-air diffusion jet flames simulating 14% (CAJF14) and 28% (CAJF28) partial ammonia cracking ratio with Reynolds numbers of 11,200. The precision and accuracy of the system were validated in laminar counterflow and laminar jet flames to ensure data quality. The scalar structure in turbulent flames is examined using conditional mean and rms radial profiles, scatterplots in mixture fraction space, as well as statistics conditioned on mixture fraction and physical spaces. These results are compared with opposed diffusion flow 1D simulation with multi-component transport model and Le=1 transport model to visualize the effects of differential diffusion on the scalar structure at various axial positions. Finally, localized extinction was found in CAJF14 but not for the more stable CAJF28, and the probability of localized extinction was less than 2.5%. The dataset is provided as supplemental material and can be used for the validation of numerical models.
AB - This work presents the first quantitative Raman measurements of temperature, mass fractions, and mixture fractions in two turbulent ammonia/hydrogen/nitrogen-air diffusion jet flames simulating 14% (CAJF14) and 28% (CAJF28) partial ammonia cracking ratio with Reynolds numbers of 11,200. The precision and accuracy of the system were validated in laminar counterflow and laminar jet flames to ensure data quality. The scalar structure in turbulent flames is examined using conditional mean and rms radial profiles, scatterplots in mixture fraction space, as well as statistics conditioned on mixture fraction and physical spaces. These results are compared with opposed diffusion flow 1D simulation with multi-component transport model and Le=1 transport model to visualize the effects of differential diffusion on the scalar structure at various axial positions. Finally, localized extinction was found in CAJF14 but not for the more stable CAJF28, and the probability of localized extinction was less than 2.5%. The dataset is provided as supplemental material and can be used for the validation of numerical models.
UR - http://hdl.handle.net/10754/679842
UR - https://linkinghub.elsevier.com/retrieve/pii/S0010218022003078
U2 - 10.1016/j.combustflame.2022.112292
DO - 10.1016/j.combustflame.2022.112292
M3 - Article
SN - 0010-2180
VL - 244
SP - 112292
JO - Combustion and Flame
JF - Combustion and Flame
ER -