C122 DNS による乱流予混合火炎の輸送特性の解明

概要

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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. 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. It is shown that the mean pressure gradient term in the Favre-averaged transport equation of turbulent kinetic energy has an important role on the produce of the kinetic energy in the flame region.
日本流体力学会の論文
2000-07-25