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利用定容燃烧弹装置和高速纹影摄像系统开展了不同初始温度、初始压力和当量比下乙醇与空气预混的层流燃烧速度的试验研究,并通过线性回归给出了层流燃烧速度的表达式.结果表明:混合气的无拉伸层流火焰燃烧速度随当量比的增加先增加后降低,并在当量比为1.1附近取得最大值;火焰燃烧速度随初始压力的增加而降低,随初始温度的增加而增加.拟合公式和试验数据呈现较好的一致性,可用于层流燃烧速度的近似计算.
The experiments of laminar burning velocity of premixed ethanol and air at different initial temperature, initial pressure and equivalence ratio were carried out by using constant volume combustion bomb device and high-speed schlieren imaging system. The linear regression was given to the laminar flow rate The results show that the flame velocity increases with the increase of equivalence ratio and then decreases with the increase of equivalence ratio and reaches the maximum at an equivalence ratio of about 1.1. The flame burning rate decreases with the increase of initial pressure The initial temperature increases, the fitting formula and the experimental data show a good consistency, which can be used for the approximate calculation of the laminar burning velocity.