1. Background

Composite propellant is an energy-containing material that is often subjected to impact, heat, friction and static electricity during production, processing, storage, transportation and use. These factors can cause physicochemical reactions of propellants, and in severe cases may lead to ignition combustion of propellants causing explosions. Therefore, the study of propellant ignition, combustion and explosion is a very important part of the industry.

2. Research

Slow bakeout test is widely used to analyze the safety of propellants under accidental thermal stimulation. In order to study the effect of composite propellant preignition technology on thermal safety and combustion characteristics, Mr. Liang's research team from Beijing Institute of Technology designed a quantitative evaluation experiment on the intensity of slow bakeout reaction of composite propellant charge, considering different kinds of propellants. The experimental method of quantitative evaluation is to study the safety of the munitions by using the slow-bake intensity.

As in the experimental setup shown above, a thick aluminum plate and a cylindrical tank are placed between the upper end caps. When the propellant is ignited, the pressure increases and the aluminum plate ruptures under the pressure. The gas acts on the slider, causing it to move and propel. Two contact wires are arranged above the color marked rod. Moving the slider one of the wires produces an open circuit which triggers the high speed camera to start recording the movement of the slider. The high-speed camera used in the experiment is the Model X113, with acquisition parameters of 1280×1024@6800fps and a maximum frame rate of up to 500000fps.

3.Conclusions of The Study

In this study, the reaction intensity of propellant burning and propellant combustion were analyzed to determine the pre-ignition evolution law of composite propellant at different temperatures under slow heating conditions. The correspondence between the propellant ignition temperature and the reaction intensity is examined, and the reaction mechanism of slow baking combustion under pre-ignition conditions is explored.

4.Industry applications

Battery puncture deflagration, engine explosion, fire experiments, etc., in these experiments, high-speed camera can not only be used as a recording instrument, but also can be measured to get the flame spread speed and other information.