Stochastic simulation of the structure and propagation rate of turbulent premixed flames

摘要: A stochastic simulation model of the wrinkled flamelet regime turbulent premixed combustion is shown to exhibit several postulated scaling properties governing flame structure and propagation rate. The model, based on linear-eddy molecular mixing in flow, incorporates laminar burning flamelets resultant decrease surface area, convection area growth due stirring. Simulated realization, implemented a one-dimensional domain representing longitudinal line through brush, (1) linear dependence speed u{sub T} velocity fluctuation u{prime}, (2) fractal structure, (3) an lower cutoff that can be plausibly characterized either by Kolmogorov scale L{sub K} {approximately} Re{sup {minus}3/4}L, where Re turbulence Reynolds number L integral scale, or Gibson sale G} (u{prime}/S{sub L}){sup 3}L, S{sub L} speed. latter ambiguity indicates values investigated computationally (up 1000) are not high enough fully resolve high-Re limiting behavior, reflecting analogous limitation typical experimental configurations. experimentally observed dimension D at low u{prime}/S{submore » reproduced, interpreted as insufficient dynamic range rather than intrinsic u{prime}/S{sub L}. 14 refs., 4 figs.« less