The invention belongs to the technical field of
combustion science and
chemical kinetics simulation, and provides a method for predicting the lower combustible limit of mixed
combustible gas. The method comprises the following steps: firstly, constructing and verifying a laminar
flame velocity mechanism covering a
single component and multiple components and the applicability to multi-component fuel; secondly, on the basis that
flame stretching and
radiation effects are considered in a traditional model, a dynamic
instability factor is further introduced, so that the prediction precision of the lower combustible limit of the low-Lewis-number
combustible gas is improved; finally, a single-component
data set is generated in a unified mode, multiple regression algorithms are adopted for training and comparison, a prediction model is determined in a preferential mode, the Lunchaterow principle is combined, generalization prediction of the multi-component combustible
lower limit is achieved, and finally comparison
verification is conducted with existing experimental data. According to the
system and the method, the dependence on a large-scale training
data set is remarkably reduced, the calculation efficiency is improved on the premise of ensuring the prediction precision, and the
system and the method have obvious
engineering application value and are particularly suitable for the safety-
critical field.