Differential diffusion effects in the near field of non-premixed NH3/H2/N2-air jet flames at elevated pressure

Hao Tang; Chaobo Yang; Yedhu Krishna; Guoqing Wang; William L. Roberts; Thibault Guiberti; Gaetano Magnotti

doi:10.1016/j.expthermflusci.2023.111020

Differential diffusion effects in the near field of non-premixed NH3/H2/N2-air jet flames at elevated pressure

Hao Tang, Chaobo Yang, Yedhu Krishna, Guoqing Wang, William L. Roberts, Thibault Guiberti, Gaetano Magnotti

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

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 (

Original language	English (US)
Pages (from-to)	111020
Journal	Experimental Thermal and Fluid Science
DOIs	https://doi.org/10.1016/j.expthermflusci.2023.111020
State	Published - Aug 6 2023

Bibliographical note

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).

ASJC Scopus subject areas

General Chemical Engineering
Mechanical Engineering
Nuclear Energy and Engineering
Fluid Flow and Transfer Processes
Aerospace Engineering

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10.1016/j.expthermflusci.2023.111020

https://repository.kaust.edu.sa/bitstream/10754/693507/1/1-s2.0-S0894177723001760-main_removed.pdf

Cite this

@article{5658d019b4094fe487a43c36b39827a8,

title = "Differential diffusion effects in the near field of non-premixed NH3/H2/N2-air jet flames at elevated pressure",

abstract = "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 (",

author = "Hao Tang and Chaobo Yang and Yedhu Krishna and Guoqing Wang and Roberts, {William L.} and Thibault Guiberti and Gaetano Magnotti",

note = "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).",

year = "2023",

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doi = "10.1016/j.expthermflusci.2023.111020",

language = "English (US)",

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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 (

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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 -

Differential diffusion effects in the near field of non-premixed NH3/H2/N2-air jet flames at elevated pressure

Abstract

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ASJC Scopus subject areas

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