Effect of H2 and O2 enrichment on the laminar burning velocities of NH3+H2+N2+O2 flames: Experimental and kinetic study

Han，Xinlu1; Wang，Zhihua2; Zhou，Bo3; He，Yong2; Zhu，Yanqun2; Cen，Kefa2

2023-09-01

10.1016/j.jaecs.2023.100160

Applications in Energy and Combustion Science   Impact Factor & Quartile

2666-352X

2666-352X

Ammonia (NH) has gained broad attention as a carbon-free alternative fuel, and its blend with H has been especially investigated to mediate the low reactivity of NH. In the present work, the laminar burning velocities (S) of NH+H+N+O flames were investigated at 1 atm and 298 K, and the oxygen fractions (x) in O+N were varied from 0.16 to 0.26, comprising a set of conditions that have not yet been investigated in literature. An updated mechanism was proposed on the basis of our previous published mechanism, which was validated using not only the present data, but also the literature data for NH laminar burning velocities and ignition delay times. Over the tested experimental conditions, better predictions were achieved with the updated mechanism. Simulations using the updated and five literature mechanisms were carried out, i.e., mechanisms from Stagni, Bertolino, Shrestha, Konnov, and Mei. The updated and Mei mechanisms reproduce the best the present experimental data. To investigate which reactions influence most the S increments due to O and H addition, S increment parameters were defined for x and x separately. Based on the available experimental data, detailed sensitivity analyses were carried out for these target parameters using the updated and some other mechanisms from the literature. It's found that reactions dominating these parameters could be largely different, thus considerations covering all aspects of S as well as the S increment parameters are suggested for the NH mechanism validations. Despite the S increment parameters have different tendencies against the x and x with different reaction sensitivities, local similarities are found if the increments of x and x have been enough refined. Specifically, when the x and x values grow larger, the effects of their increase become well blurred, extending the region of the similar conditions, which is helpful for the determination of inconsistent experimental data.

Ammonia Hydrogen Kinetic mechanism Laminar burning velocity Partial dissociation

ESCI

English

Others

China Postdoctoral Science Foundation[2021TQ0366];National Natural Science Foundation of China[52206189];Natural Science Foundation of Zhejiang Province[LZ21E06003];

Thermodynamics ; Energy & Fuels ; Engineering

Thermodynamics ; Energy & Fuels ; Engineering, Chemical ; Engineering, Mechanical

WOS:001044662400001

ELSEVIER

2-s2.0-85162170947

Scopus

1.College of New Energy,China University of Petroleum (East China),Qingdao,266580,China
2.State Key Laboratory of Clean Energy Utilization,Zhejiang University,Hangzhou,310027,China
3.Department of Mechanics and Aerospace Engineering,Southern University of Science and Technology,Shenzhen,518055,China

Han，Xinlu,Wang，Zhihua,Zhou，Bo,et al. Effect of H2 and O2 enrichment on the laminar burning velocities of NH3+H2+N2+O2 flames: Experimental and kinetic study[J]. Applications in Energy and Combustion Science,2023,15.

Han，Xinlu,Wang，Zhihua,Zhou，Bo,He，Yong,Zhu，Yanqun,&Cen，Kefa.(2023).Effect of H2 and O2 enrichment on the laminar burning velocities of NH3+H2+N2+O2 flames: Experimental and kinetic study.Applications in Energy and Combustion Science,15.

Han，Xinlu,et al."Effect of H2 and O2 enrichment on the laminar burning velocities of NH3+H2+N2+O2 flames: Experimental and kinetic study".Applications in Energy and Combustion Science 15(2023).