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Schematic diagram of our experimental set-up.
Simultaneous presence of vertical, stationary, and oblique modes.
Density profile of vertical mode (coherent state) of Fig. 2 and corresponding power spectra.
Generation of self-excited DDW above three glass plates (oblique view).
(a) initial indication of topological defects (wave front merging) at t = 0.86 s (after the ignition of self-excited DDW). (b) Complete merging of two wave fronts after 1 s, flowing inward. (c) New wave front is coming out in opposite direction after merging of two wave fronts (t = 1.67 s). (d) Breaking of upper wave front after 6.43 s. (e) Mixing of wave fronts (intermediate state) starts after increasing the acetylene flow rate both in vertical and oblique propagating mode (t = 13.3 s). (f) DDW completely dies out after t = 66.67 s (at pressure 0.32 mbar).
Density profile of vertical mode (intermediate state) of Fig. 5(e) and corresponding power spectra.
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