Evolution of flame-conditioned velocity statistics in turbulent premixed jet flames at low and high Karlovitz numbers

Turbulence in low Karlovitz number premixed flames is strongly affected by small-scale combustion heat release. At low Karlovitz number conditions, flame-normal thermal expansion leads to increased anisotropy of the velocity field, and pressure-dilatation becomes the most significant source of turbulent kinetic energy (TKE). These effects are balanced in TKE budgets by the phenomenon of “negative production,” which leads to changes to the...