Turbulent hydrogen premixed flames at high pressure and high temperature

Sofiane Al Kassar; Sara Cantagalli; William Lauder; Geveen Arumapperuma; Antonio Attili

Turbulent hydrogen premixed flames at high pressure and high temperature

Sofiane Al Kassar, Sara Cantagalli, William Lauder, Geveen Arumapperuma, Antonio Attili

School of Engineering

Research output: Working paper › Preprint

Abstract

The combined influence of elevated pressure and temperature, representative of gas-turbine operating conditions, on lean premixed hydrogen flames is investigated using Direct Numerical Simulations (DNS) of a turbulent jet. Three cases are considered: 1 atm/298 K, 5 atm/472 K, and 20 atm/700 K, scaled to maintain the same jet Reynolds number and nominal Karlovitz number in the unburnt mixture, enabling a direct comparison of flame-turbulence interactions. Although the combined effects are moderate overall due to compensating influences, measurable differences arise in flame structure and turbulence-flame coupling. They are driven by reduced turbulence dissipation within the flame at high pressure and temperature, which enhances the interaction between turbulence and thermodiffusive effects. Finally, the tangential strain rate exhibits the same universal Kolmogorov scaling observed in homogeneous-isotropic turbulence and in methane flames, confirming its robustness for modelling turbulence

Original language	Undefined/Unknown
Publisher	ArXiv
Publication status	Published - 22 Jan 2026

Keywords / Materials (for Non-textual outputs)

physics.flu-dyn

Access to Document

2601.15848v1Submitted manuscript, 4.81 MBLicence: Creative Commons: Attribution (CC-BY)

https://arxiv.org/abs/2601.15848Licence: Other

Cite this

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title = "Turbulent hydrogen premixed flames at high pressure and high temperature",

abstract = "The combined influence of elevated pressure and temperature, representative of gas-turbine operating conditions, on lean premixed hydrogen flames is investigated using Direct Numerical Simulations (DNS) of a turbulent jet. Three cases are considered: 1 atm/298 K, 5 atm/472 K, and 20 atm/700 K, scaled to maintain the same jet Reynolds number and nominal Karlovitz number in the unburnt mixture, enabling a direct comparison of flame-turbulence interactions. Although the combined effects are moderate overall due to compensating influences, measurable differences arise in flame structure and turbulence-flame coupling. They are driven by reduced turbulence dissipation within the flame at high pressure and temperature, which enhances the interaction between turbulence and thermodiffusive effects. Finally, the tangential strain rate exhibits the same universal Kolmogorov scaling observed in homogeneous-isotropic turbulence and in methane flames, confirming its robustness for modelling turbulence",

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author = "Kassar, \{Sofiane Al\} and Sara Cantagalli and William Lauder and Geveen Arumapperuma and Antonio Attili",

note = "7 pages, 4 figures, 1 table, submitted to the 41st International Symposium on Combustion (ISOC)",

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T1 - Turbulent hydrogen premixed flames at high pressure and high temperature

AU - Kassar, Sofiane Al

AU - Cantagalli, Sara

AU - Lauder, William

AU - Arumapperuma, Geveen

AU - Attili, Antonio

N1 - 7 pages, 4 figures, 1 table, submitted to the 41st International Symposium on Combustion (ISOC)

PY - 2026/1/22

Y1 - 2026/1/22

N2 - The combined influence of elevated pressure and temperature, representative of gas-turbine operating conditions, on lean premixed hydrogen flames is investigated using Direct Numerical Simulations (DNS) of a turbulent jet. Three cases are considered: 1 atm/298 K, 5 atm/472 K, and 20 atm/700 K, scaled to maintain the same jet Reynolds number and nominal Karlovitz number in the unburnt mixture, enabling a direct comparison of flame-turbulence interactions. Although the combined effects are moderate overall due to compensating influences, measurable differences arise in flame structure and turbulence-flame coupling. They are driven by reduced turbulence dissipation within the flame at high pressure and temperature, which enhances the interaction between turbulence and thermodiffusive effects. Finally, the tangential strain rate exhibits the same universal Kolmogorov scaling observed in homogeneous-isotropic turbulence and in methane flames, confirming its robustness for modelling turbulence

AB - The combined influence of elevated pressure and temperature, representative of gas-turbine operating conditions, on lean premixed hydrogen flames is investigated using Direct Numerical Simulations (DNS) of a turbulent jet. Three cases are considered: 1 atm/298 K, 5 atm/472 K, and 20 atm/700 K, scaled to maintain the same jet Reynolds number and nominal Karlovitz number in the unburnt mixture, enabling a direct comparison of flame-turbulence interactions. Although the combined effects are moderate overall due to compensating influences, measurable differences arise in flame structure and turbulence-flame coupling. They are driven by reduced turbulence dissipation within the flame at high pressure and temperature, which enhances the interaction between turbulence and thermodiffusive effects. Finally, the tangential strain rate exhibits the same universal Kolmogorov scaling observed in homogeneous-isotropic turbulence and in methane flames, confirming its robustness for modelling turbulence

KW - physics.flu-dyn

M3 - Preprint

BT - Turbulent hydrogen premixed flames at high pressure and high temperature

PB - ArXiv

ER -