J056042 有効乱れ強さによる乱流火炎伝播特性の検討([J05604]乱流における運動量,熱,物質の輸送現象(4))

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Turbulent flame front area is considered as the most dominant factor of turbulent burning velocity. Therefore, it is important to investigate the contribution of the flame front area to turbulent burning velocity. In this study, turbulent explosions of iso-octane/air mixtures at equivalence ratios of 0.8 and 1.4 were carried out. The laser tomography was adopted to obtain the cross-sectional image of turbulent flame. The flame front area was evaluated using the perimeter of the cross-sectional image of turbulent flame. The ratio of turbulent flame perimeter to circle perimeter of mean radius increased with the increase in the ratio of effective turbulence intensity to unstretched laminar burning velocity. The ratios of perimeter of turbulent flame to the mean circle perimeter of both equivalence ratios had no significant difference. However, the ratios of turbulent burning velocity to unstretched laminar burning velocity at equivalence ratio of 1.4 were larger than those of 0.8. This result was considered to be due to the thermo-diffusive effects.
一般社団法人日本機械学会の論文
2011-09-11