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用大活化能渐近法推导了燃烧着的燃料颗粒在浮升力产生的驻点边界层流动情况下的熄火准则。熄火因子已按火焰薄层解由数值方法确定,故此准则可直接用于计算。再把这个准则与现有的强迫对流驻点边界层情况和无对流的球对称情况的熄火准则统一在一起,它们共同为受到不同性质和强度的对流时燃料颗粒的熄火敏感性规定了界限。这些准则与各种系统参数之间的函数关系也以统一的观点进行了研究。准则所体现的各种变化趋向与现有的实验数据相一致。
The asymptotic behavior of large activation energy is used to deduce the flameout criterion of combustion fuel particles under the floating boundary layer flow. The flameout factor has been determined numerically by the flame laminar solution, so the criterion can be used directly in the calculation. Then this criterion is unified with the existing standoff boundary conditions of convective stationary states and the flame-out criterion of ballistic symmetry without convection, and they jointly set a limit for the flameout sensitivity of fuel particles under convection with different properties and intensities. The functional relationships between these guidelines and various system parameters are also studied in a unified view. The trends reflected in the guidelines are consistent with the available experimental data.