J056045 マイクロ燃焼器における乱流及び火炎構造の動的特性([J05604]乱流における運動量,熱,物質の輸送現象(4))

概要

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Direct numerical simulation (DNS) of hydrogen-air premixed flame with swirling flow is conducted to investigate dynamic characteristics of turbulent and flame structures in a micro-scale combustor. Size of the combustor is assumed to be 15.0 mm in streamwise direction and 10.0 mm X 10.0 mm cross-section. DNS is carried out under a swirl number: S = 0.6. Large-scale helical vortical structures are generated near the inlet of combustion chamber, and a lot of fine-scale vortices appear downstream. Interactions between dynamics of large-scale vertical structures and pressure fluctuations in the combustor are focused on. The large-scale coherent structures generated near the inlet grow, pass through regions of high heat release rate and disappear. The period of this transition corresponds to the period of the pressure oscillation on side wall of the combustor. Fluctuations of heat release rate induced by progress of the large-scale vortical structures influence pressure fluctuations. These results suggest that controlling the occurrence of the large-scale eddies is important for suppression of pressure fluctuations.
一般社団法人日本機械学会の論文
2011-09-11