Local flame propagation speeds along wrinkled, unsteady, stretched premixed flames

摘要: The local displacement speed was measured along a premixed flame that is wrinkled, unsteady, stretched, and freely propagating. argued to be the most important sensitive parameter must simulated correctly in numerical simulations of turbulent flames. An axisymmetric wrinkle created so all components normal vector stretch can measured: particle image velocimetry high-speed shadowgraph movies yield difference between interface velocity reactant velocity, which speed. This repeatable flame-vortex interaction problem provides useful test data for direct numberical simulation (DNS) models theory. Displacement varies enormously (by factor 7.5) flame; variation, much larger than predicted by steady-state Furthermore, curvature plays dominant role determining Observed trends do not agree with those standard However, if modified theory based only on strain ignored, observed tend this many regions flame, but regions.