Special theory of gradual ignition

摘要

The article focuses on the discrepancy between the concept of geometric combustion of propellant grains and the course of Г emission function (Liveliness) measured in a closed vessel (CV). If the propellant grains burned according to the geometric law, the CV the shapes of the propellant grains would have to differentiate. Apart from this, the Livelinesses of propellants with various shapes are similar. There tends to be a "hump" at their beginning (ballooning, взмыв, клюв), and then they proceed approximately according to the geometric law of combustion and always ends in zero. The so-called geometric progressivity of multi-perforated propellant grains had never been proved in an experiment. Quite the opposite - the more channels there are in a propellant grain, the faster it disintegrates. The article presents a brief introduction to the theory that explains the conflict between the geometric and physical law of combustion by the gradual ignition phenomenon of the propellant charge. The hydraulic resistance of the propellant grains causes that the ignition wave penetrates the charge with a final velocity and before it reaches the bottom of the projectile, the shape of the first ignited grains closest to the igniter is different that the shape of the grains ignited as the last ones.