Small-scale intermittency of premixed turbulent flames

Premixed turbulent flames, encountered in power generation and propulsion engines, are an archetype of a randomly advected, self-propagating surface. While such flame is known to exhibit large-scale intermittent flapping, the possible intermittency its small-scale fluctuations has been largely disregarded. Here, we experimentally reveal inner premixed V-flame, while clearly distinguishing this feature from outer intermittency. From temporal measurements flame, find frequency spectrum that power-law subrange with exponent close $-2$, which shown follow Kolmogorov phenomenology. Crucially, however, moments increment position found scale anomalously, exponents saturate at higher-orders. This signature originate high-curvature, cusp-like structures on surface, have significance for modeling heat release rate other key properties flames.