What is it about?
Parametric large eddy simulations of a supersonic lifted hydrogen flame are performed. Impacts of Lewis number on autoignition locations and strengths, and flame structures and stabilisation are numerically observed. The impacts of Lewis number are related to mass and thermal diffusions predicted at fuel-coflow and/or coflow-ambient air mixing layers, rationalised by non-negligible mass and thermal diffusions compared to convection. Impacts of turbulent Schmidt and Prandtl numbers are minor as sub-grid scale mass and thermal diffusions are subordinate to filtered diffusion.
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Why is it important?
The rapid, ongoing development of hypersonic propulsion systems, such as scramjet engines, has sparked research interest in supersonic turbulent flames. Computational fluid dynamics, particularly large eddy simulation, play a significantly important role in providing fundamental understandings of supersonic turbulent flames. This work contributes to the knowledge about the optimal choice of Lewis, turbulent Schmidt and Prandtl numbers that balances numerical accuracy and computational efficiency in large eddy simulations of supersonic turbulent flames.
Perspectives
I hope this work advances computational fluid dynamics tools of supersonic turbulent flames and promotes the development of cleaner and more efficient propulsion systems.
Ruixuan Zhu
University of Oxford
Read the Original
This page is a summary of: Large eddy simulation of a supersonic lifted hydrogen flame: Impacts of Lewis, turbulent Schmidt and Prandtl numbers, Physics of Fluids, July 2024, American Institute of Physics,
DOI: 10.1063/5.0214630.
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