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

Minh Tien Nguyen, Dewei Yu, Chunyen Chen and Shenqyang (Steven) Shy
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Minh Tien Nguyen: Department of Mechanical Engineering, National Central University, Tao-yuan City 32001, Taiwan
Dewei Yu: Department of Mechanical Engineering, National Central University, Tao-yuan City 32001, Taiwan
Chunyen Chen: Department of Mechanical Engineering, National Central University, Tao-yuan City 32001, Taiwan
Shenqyang (Steven) Shy: Department of Mechanical Engineering, National Central University, Tao-yuan City 32001, Taiwan

Energies, 2019, vol. 12, issue 10, 1-13

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 ( S T ) 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 S T / S L data versus u ′/ S L are very scattering, where S L 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 S T / S L 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.

Keywords: iso-octane; high-pressure turbulent burning velocity; Lewis number; general correlations; self-similar spherical flame propagation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
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