论文标题
部分可观测时空混沌系统的无模型预测
What connects ignition and deflagration? -- On explosive transition of deflagration
论文作者
论文摘要
在理论和计算上研究了点火和幻影分析之间的一般关系。简单的分析表明，在0D均匀点火中，归一化燃料质量分数和归一化温度的时间演变等同于如果应用火焰的时空转化，则在刘易斯的一维层次前火焰中的空间演变。此外，计算表明，发现预热区中归一化燃料质量分数的降低程度按以下顺序：当刘易斯数小于统一时，当刘易斯数量是统一（=点火）时，当刘易斯的数字大于统一时。这表明，仅对于1D层状预混合火焰，爆炸过渡附近的预热区域的点火才能发生，而路易斯数量大于统一。总而言之，在发动机或冲击波中被活塞压缩的预混合气体中，点火和火焰传播的特征时间可能是相同的数量级，因此刘易斯数字决定了这种条件下预混合火焰结构的存在。
The general relation between ignition and deflagration analyses was studied theoretically and computationally. Simple analysis showed that the temporal evolutions of normalized fuel mass fraction and the normalized temperature in a 0D homogeneous ignition are equivalent to the spatial evolutions of those in a 1D laminar premixed flame at Lewis number of unity if a spatio-temporal transformation of the flame is applied. Furthermore, computations showed that the degree of reduction in normalized fuel mass fraction in the preheat zone was found to be in the following order: when the Lewis number is less than unity, when the Lewis number is unity (= ignition), and when the Lewis number is greater than unity. This suggested that ignition in the preheat zone near the explosive transition can only occur for 1D laminar premixed flames with Lewis number greater than unity. In summary, the characteristic times of ignition and flame propagation can be of the same order of magnitude in premixed gases compressed by piston in engines or shock waves, and thus the Lewis number determines the existence of premixed flame structure under such conditions.
