Laminar Flame Speed & Velocity Calculator
Combustion kinetics & burner physics: Calculate fundamental laminar burning velocity ($S_L$), flame front thickness ($\delta_L$), and thermal diffusivity scaling across temperatures and pressures.
Fuel Mixture & Equivalence Ratio
Fuel-air mixture
φ = 1.0 stoich, < 1 lean, > 1 rich
300 K = 27°C (Ambient)
Atmospheric = 1 bar, IC engine = 5–25 bar
Metghalchi-Keck Power-Law Scaling
Laminar burning velocity scales with preheat temperature and pressure according to:
$$S_L(T_u, P) = S_{L0}(\phi) \left(\frac{T_u}{T_0}\right)^\alpha \left(\frac{P}{P_0}\right)^\beta$$
Where $\alpha \approx 1.7 - 2.0$ (strong preheat acceleration) and $\beta \approx -0.15$ to $-0.5$ (pressure suppresses flame speed due to three-body recombination reactions).
Laminar Flame Speed Results
Laminar Burning Velocity (S_L)
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Burning Velocity (m/s)
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Flame Front Thickness & Diffusivity
Thermal Flame Thickness (δ_L)
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δ_L = α_th / S_L
Thermal Diffusivity (α_th)
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k / (ρ · C_p)
Burner Stability Implications
Flashback Propensity:
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Quenching Distance (d_q ~ 2·δ_L):
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Turbulent Flame Regime:
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