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<p>This study numerically examines the interaction between ethylene (C<sub>2</sub>H<sub>4</sub>) air flames and shock waves under premixed initial temperatures ranging from 900 to 1400&#xa0;K. Equivalence ratios of 0.75, 1.0, and 1.15 are considered to investigate flame propagation behavior. The evolution of flame vorticity and its temporal development are analyzed at different equivalence ratios and initial premixed temperatures, revealing that flame dynamics are primarily governed by the Darrieus–Landau instability mechanism. Acoustic impedance is evaluated along and across the flame, showing its minimum near the flame root. Shock–flame interaction produces reflected expansion waves, with their strength influenced by impedance variations across the flame. At the flame tip, interaction between shocks and flame-generated vorticity gives rise to an S-shaped shock structure. Overall, shock–flame interaction leads to flame deformation, driven predominantly by the Richtmyer–Meshkov instability mechanism.</p>

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Investigating the dynamics of shock wave and flame interactions

  • 期刊论文

  • 发表日期：

    2025年9月25日

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  • Sidyant Kumar,
  • Lokamanya Chikmath,
  • Soujanya Patil,
  • Nidhi Murkute,
  • Rahil Gorwankol,
  • Madhushree Patil

摘要

This study numerically examines the interaction between ethylene (C2H4) air flames and shock waves under premixed initial temperatures ranging from 900 to 1400 K. Equivalence ratios of 0.75, 1.0, and 1.15 are considered to investigate flame propagation behavior. The evolution of flame vorticity and its temporal development are analyzed at different equivalence ratios and initial premixed temperatures, revealing that flame dynamics are primarily governed by the Darrieus–Landau instability mechanism. Acoustic impedance is evaluated along and across the flame, showing its minimum near the flame root. Shock–flame interaction produces reflected expansion waves, with their strength influenced by impedance variations across the flame. At the flame tip, interaction between shocks and flame-generated vorticity gives rise to an S-shaped shock structure. Overall, shock–flame interaction leads to flame deformation, driven predominantly by the Richtmyer–Meshkov instability mechanism.