乱流拡散火炎内の流れの特性 : 第1報, 乱流拡散火炎の相似性

概要

論文の詳細を見る
This experimental study aims at investigating the flow characteristics on turbulent diffusion flames at the low Reynolds numbers of 2000 and 3000 at the nozzle exit. Measurements were made of velocity and temperature by means of a LDV and a fine thermocouple under flows of three equivalence ratios (6, 24, ∞) to each Reynolds number. The mass flux distribution along the flame axis shows three separate flow regions, that is, potential core, free jet and buoyancy regions. The maximum temperature position on the axis xp was the point where combustion was almost completed. This position was a representative length of flame derived from not noly fluid dynamic characteristics but also chemical characteristics. Both temperature and mass flux distribution against the normalized axial distance x/x_p have good similarity up to the free jet flow region. The local Froude number defined in the buoyancy region gradually approached small constant values for each flow condition. These results show that x/x_p is one of the important parameters in the expression of the flow characteristics of relative temeprature and mass flux in turbulent diffusion flames.
一般社団法人日本機械学会の論文
1992-01-25