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Related Experiment Videos

Explosion triggering by an accelerating flame.

Vitaly Bychkov1, V'yacheslav Akkerman

  • 1Institute of Physics, Umeå University, SE-901 87 Umeå, Sweden.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|August 16, 2006
PubMed
Summary

An analytical theory explains explosion triggering by accelerating flames. It predicts explosion conditions and timing based on chemical kinetics, validated by simulations.

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Area of Science:

  • Combustion science
  • Theoretical physics
  • Chemical kinetics

Background:

  • Flame acceleration can trigger explosions in combustible gas mixtures.
  • Understanding the precise conditions and timing of explosion onset is crucial for safety and prediction.

Purpose of the Study:

  • To develop an analytical theory for explosion triggering by an accelerating flame.
  • To derive the condition for explosion in the gas mixture ahead of the flame front.
  • To determine the explosion instant based on known chemical kinetics.

Main Methods:

  • Developed a theory describing the structure of a one-dimensional isentropic compression wave driven by a flame front.
  • Derived the explosion condition and determined the explosion instant.
  • Applied the theory to a single Arrhenius reaction model, including a cutoff temperature variation.
  • Identified limitations related to shock formation in the compression wave.

Main Results:

  • The theory successfully describes the compression wave structure and predicts explosion conditions.
  • The derived explosion instant shows good agreement with previous numerical simulations.
  • Limitations of the theory were identified concerning shock wave formation.

Conclusions:

  • The developed analytical theory provides a robust framework for understanding explosion triggering by accelerating flames.
  • The model is applicable to various chemical kinetics, including Arrhenius-type reactions.
  • The findings offer valuable insights for predicting and mitigating explosion hazards in combustion systems.

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