マイクロ燃焼器における乱流火炎特性と壁面熱伝達(拡散・熱物質輸送(1),一般講演)

概要

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Direct numerical simulation (DNS) of hydrogen-air turbulent premixed flame with swirling flow in a cuboid combustion chamber is conducted to investigate hydrodynamic behaviors, characteristics of flame structures and heat transfer properties of a micro gas turbine combustor. The size of the combustion chamber is 15.0mm×10.0mm×10.0mm. To investigate swirling effects on flow and combustion field, DNS of both cold and reactive flows is carried out under two swirl number conditions: S=0.6 and 1.2. Large-scale coherent vortical structures such as ring-shaped or helical structures are generated near the inlet of chamber, and lots of small-scale vortices appear downstream. Flame front tends to be entrained by large-scale coherent vortical structures. Distribution of instantaneous heat flux on walls depends on swirl number. However, for both swirl number cases, the ratio of total heat loss on the walls against total heat release converges to a constant value.
日本流体力学会の論文
2010-09-09