ИСТИНА

Laminar premixed flames exhibit instabilities of hydrodynamic and thermal-diffusive types, leading to growth of perturbations, wrinkling of flame front and formation of cells. In this work, results of an experimental study on cellular flame propagation are presented in the configuration where combustion occurs in a gap between two parallel plates, with the separation distance (few millimeters) much smaller than the lateral sizes of the plates (60 cm diameter). Such a quasi-2D setup provides unique possibilities for visualization of flame front propagation features, including the instantaneous shape of the leading edge, and overall flame propagation pattern obtained by the long-exposure photography. Results of experiments on stoichiometric and fuel-rich propane flames are presented, including those obtained upon ignition at one or two points. Fractal dimension of flame front is evaluated at different distances from the ignition point.