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利用高速纹影摄像法和球形发展火焰研究了不同初始压力和不同当量比下的二乙醚-空气预混合气层流火焰燃烧特性,得到了层流燃烧速率、马克斯坦数、胞状结构出现的临界半径等燃烧参数,分析了火焰前锋面的不稳定性.研究结果表明:无拉伸层流燃烧速率随初始压力增加而减小,随当量比的增加而呈现出先增加后减少的趋势,无拉伸层流燃烧速率的最大值出现在当量比为1.1处.马克斯坦数随初始压力和当量比的增加而减小,反映出初始压力和当量比降低了火焰前锋面的稳定性.胞状结构出现的临界半径随初始压力的增加而减小.
The combustion characteristics of laminar flow of diethylether-air premixed at different initial pressures and different equivalence ratios were studied by using high speed schlieren photography and spherical flame development, and the critical values of laminar flow rate, Maxstein number and cellular structure appeared Radius and other combustion parameters, the instability of the flame front is analyzed.The results show that the burning rate of the non-tensile laminar flow decreases with the increase of the initial pressure, and increases with the equivalence ratio and then increases first and then decreases, The maximum laminar flow rate appeared at an equivalence ratio of 1.1, and the Maxstam number decreased with the increase of initial pressure and equivalence ratio, indicating that the initial pressure and equivalence ratio decreased the stability of the flame front. The critical radius decreases with increasing initial pressure.