希薄水素混合気の乱流燃焼速度と局所燃焼速度特性(熱工学,内燃機関,動力など)

概要

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Comprehension of the turbulent burning velocity for lean hydrogen mixtures is inevitable in the improved design of hydrogen engines. The present study is performed to examine experimentally the turbulent burning velocity of lean hydrogen mixtures whose laminar burning velocity S_<LO> and equivalence ratio φ are varied extensively from 15 to 35 cm/s and approximately 0.9 to 0.3, respectively. The measured turbulent burning velocities at the same turbulence intensity show to increase as φ decreases until about 0.5. Those, however, does not show such increase when φ becomes lower than about 0.5, regardless of S_<LO>. This phenomenon is discussed by the observation of turbulent flame structure and the estimation of Markstein number. The estimation of the mean local burning velocity of the turbulent flame is made also taking account of the preferential diffusion. It is found that their tendencies with φ is changed when φ becomes about 0.5.
社団法人日本機械学会の論文
2005-01-25