Abstract
Direct numerical simulation of a turbulent premixed flame with single-step irreversible Arrhenius-type reaction is performed in order to evaluate turbulent transport properties. The simulation domain is a box of 8mm×4mm×4mm. At the inflowing boundary, the mean inflowing velocity was changed on the way of the calculation and approached the turbulent burning velocity to keep a wrinkled flame in the simulation domain. As a result, a wrinkled flame appears in the turbulent flow and the vorticity is produced near the wrinkled flame. Streamwise evolutions of turbulent fluctuations somewhat decay in front of the flame region, but all components increase dramatically in the flame region, especially x component increases more than twice as much as y, z component. By the mechanism of turbulence generation in the flame region is analyzed on the basis of the Favre-averaged transport equation of turbulent kinetic energy, it is shown that the mean pressure gradient terms have important role on the produce of the kinetic energy in the flame region.
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