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General Correlations of Iso-octane Turbulent Burning Velocities Relevant to Spark Ignition Engines

Department of Mechanical Engineering, National Central University, Tao-yuan City 32001, Taiwan
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Author to whom correspondence should be addressed.
Energies 2019, 12(10), 1848; https://doi.org/10.3390/en12101848
Received: 10 April 2019 / Revised: 8 May 2019 / Accepted: 12 May 2019 / Published: 15 May 2019
(This article belongs to the Special Issue Cleaner Combustion)
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Abstract

A better understanding of turbulent premixed flame propagation is the key for improving the efficiency of fuel consumption and reducing the emissions of spark ignition gasoline engines. In this study, we measure turbulent burning velocities (ST) of pre-vaporized iso-octane/air mixtures over wide ranges of the equivalence ratio (φ = 0.9–1.25, Le ≈ 2.94–0.93), the root-mean-square (r.m.s.) turbulent fluctuating velocity (u′ = 0–4.2 m/s), pressure p = 1–5 atm at T = 358 K and p = 0.5–3 atm at T = 373 K, where Le is the effective Lewis number. Results show that at any fixed p, T and u′, Le < 1 flames propagate faster than Le > 1 flames, of which the normalized iso-octane ST/SL data versus u′/SL are very scattering, where SL is the laminar burning velocity. But when the effect of Le is properly considered in some scaling parameters used in previous correlations, these large scattering iso-octane ST/SL data can be collapsed onto single curves by several modified general correlations, regardless of different φ, Le, T, p, and u′, showing self-similar propagation of turbulent spherical flames. The uncertainty analysis of these modified general correlations is also discussed. View Full-Text
Keywords: iso-octane; high-pressure turbulent burning velocity; Lewis number; general correlations; self-similar spherical flame propagation iso-octane; high-pressure turbulent burning velocity; Lewis number; general correlations; self-similar spherical flame propagation
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Nguyen, M.T.; Yu, D.; Chen, C.; Shy, S.S. General Correlations of Iso-octane Turbulent Burning Velocities Relevant to Spark Ignition Engines. Energies 2019, 12, 1848.

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