対向層流予混合噴霧火炎の時間平均的観察ならびに考察(熱工学,内燃機関,動力など)

概要

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A series of our counter-flow premixed spary flame experiments were reviewed, ranging from flames dominated by a rather intense turbulence to sufficiently laminar ones. It was found that highly turbulent flames were dominated by a number of large-scaled droplet clusters burning in the droplet group combustion mode, whereas sufficiently laminar flames hardly showed the group combustion characteristics. Then the detailed structure of a laminar spray flame was observed in two-dimensional counter-flow configuration, where a spray flame having a flame front stable enough except of dynamic irregularities of 1 mm or so peculiar to two-phase flames. The velocity was determined for various sizes of droplets across the flame front by phase-Doppler anemometry (PDA), and the laminar burning velocity was estimated, from the minimum value in velocity of minute droplets around the flame front, to be ca. 0.34 m/s. The Lagrangian histories of evaporating or burning droplets were tracked by the particle-tracking velocimetry (PTV) across the flame front.
社団法人日本機械学会の論文
2002-02-25