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Turbulent flame structure and speed in spark-ignition engines

1982; Elsevier BV; Volume: 19; Issue: 1 Linguagem: Inglês

10.1016/s0082-0784(82)80322-6

1878-027X

James C. Keck,

Computational Fluid Dynamics and Aerodynamics

Recent exprimental, observations of flame structure and speed in spark-ignition enginesare discussed. Schlieren photographs, shadowgraphs and laser scattering measurements strongly suggest a highly wrinkled structure for the turbulent flame in such engines. Simultaneous pressure measurements and high-speed motion picture records are used to derive two closely related sets of empirical equations for calculating burning rates. One set suggests an eddy entrainment and laminar burn-out model and the other, a laminar flame stretching and wrinkling model. Tentative correlations relating the parameters in the burning equations to engine geometry and operating variables are derived. Statistical variations in the parameters produce cycle-to-cycle dispersions in the pressure, but correlations for predicting the magnitude of the dispersions have not yet been obtained.