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本文提出了计算偏二甲肼液滴在惰性介质中的临界着火条件的两种理论。一种是类似于弗朗克-卡敏涅茨基对均匀可燃混气自燃所用的稳态分析理论。应用这一理论并经数值计算,得到了关联无因次蒸发速率和环境温度的反C形曲线,曲线的顶点即相当于临界着火点。另一种是稳态简化模型理论,它给出了方便于工程应用的临界着火准则显式。
This paper presents two theories for calculating the critical fire conditions for UDMH droplets in inert media. One is the steady-state analysis theory that is similar to that of the FRANKKONITZERK for homogeneous flammable gas autoignition. By applying this theory and by numerical calculation, the inverse C-shaped curve related to the dimensionless evaporation rate and the ambient temperature is obtained. The vertex of the curve is equivalent to the critical ignition point. The other is the steady-state simplified model theory, which gives explicit critical fire criteria for engineering applications.