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Nonequilibrium processes in meta-stable media⋆
N N Smirnov1,2,3, O G Penyazkov4,5, K L Sevrouk4
1Moscow Lomonosov State University, 119992, Moscow, Russia. ebifsun1@mech.math.msu.su.
The European Physical Journal. E, Soft Matter
|May 26, 2018
Summary
Detonation initiation in hydrogen-air mixtures was investigated. A validated 3D model revealed shock wave focusing can trigger detonation, with outcomes depending on incident shock intensity.
Area of Science:
- Fluid dynamics
- Combustion science
- Chemical kinetics
Background:
- Meta-stable systems, like reacting gas mixtures, exhibit complex behaviors near equilibrium.
- Detonation initiation is critical for understanding energetic materials and propulsion systems.
Purpose of the Study:
- To numerically and experimentally investigate detonation initiation in hydrogen-air mixtures.
- To validate and refine a 3D transient mathematical model for chemically reacting flows.
Main Methods:
- Numerical simulations of shock wave reflection and focusing in hydrogen-air mixtures.
- Experimental validation of simulation results.
- Refinement of kinetic and turbulence models based on comparative analysis.
Main Results:
- Successful validation of the 3D transient mathematical model against experimental data.
- Observed different shock wave reflection scenarios (lagging combustion, detonation formation, transient regimes) based on incident shock intensity.
- Improved kinetic and turbulence models for hydrogen-air detonation.
Conclusions:
- Shock wave focusing within a wedge is a viable mechanism for detonation initiation in hydrogen-air mixtures.
- The validated 3D model accurately predicts detonation phenomena.
- Incident shock wave intensity is a key parameter determining the detonation initiation outcome.
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