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采用等容室对燃料液滴一蒸气一空气混合气中的火焰传播进行了试验研究。试验采用单分散的和单一燃料液滴汽团作为火花点燃发动机中残余燃料液滴的简化模型。试验结果表明,在稀薄燃料侧,相同总当量比时,细微的液滴一蒸气一空气混合气的火焰速度和最高燃烧压力超过完全气态预混合气的火焰速度和最高燃烧压力。已发现,燃料液滴的汽化率和燃料液滴与未燃气体之间的滑流速彦左确定火焰球彦时起若重要的作用。
An isocarrier chamber was used to study the flame propagation in a fuel-vapor-air mixture. The experiment employed a monodisperse and single-fuel droplet steam mass as a simplified model for spark-ignited residual fuel droplets in an engine. The experimental results show that the flame velocity and the maximum combustion pressure of the fine droplet-steam-air mixture exceed the flame speed of the complete gaseous premix and the maximum combustion pressure at the lean fuel side at the same total equivalence ratio. It has been found that the vaporization rate of the fuel droplets and the slip velocity between the fuel droplets and the unburnt gas are important when determining the flame sphere.