4834 高圧下での予混合水素火炎の層流燃焼速度と不安定性(J10-4 次世代燃料及び潤滑油のためのエンジン適合技術(4),J10 次世代燃料及び潤滑油のためのエンジン適合技術)

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In this study, an optically accessed combustion vessel and high speed imaging were adopted to obtain laminar velocity measurements of spherically propagating hydrogen-air explosions at 0.06, 0.10, 0.175, 0.25 and 0.50MPa. Equivalence ratios of 0.4, 0.6, 0.8 and 1.0 were investigated and the influence of flame instability is discussed in terms of the Markstein number and flame instability burning velocity ratio (ratio of the laminar burning velocity at a flame radius of 60mm to the unstretched laminar burning velocity). The unstretched laminar burning velocity was approximately constant between 0.06 and 0.175MPa at any given equivalence ratio. However, the unstable laminar burning velocity and the flame instability burning velocity ratio increased with pressure. Markstein numbers decreased with increasing pressure. A liner relationship was observed, between Markstein number and flame instability burning velocity ratio.
社団法人日本機械学会の論文
2006-09-15