Missile fuel: species and composition
Solid rocket fuel is aa solid substance (a mixture of substances) that can burn without air and at the same time release many gaseous compounds heated to a high temperature. Such compounds are used to create reactive thrust in rocket engines.
The first types of rocket fuel werenamely solid. As a working substance, gunpowder and its analogues were used, which were used in military affairs and for the creation of fireworks. Now these compounds are used only for manufacturing small model rockets, like rocket fuel. The composition allows launching small (up to 0.5 m) rockets for several hundred meters in height. The engine in them is a small cylinder. It is filled with a solid combustible mixture, which is ignited by a red-hot wire and burns only a few seconds.
Solid-fuel rocket engine runningin the following way. After ignition, the fuel starts to burn at a specified rate, throwing a hot gaseous substance through the nozzle, which provides traction. The fuel in the engine burns until it runs out. Therefore, it is impossible to stop the process and turn off the engine, until the filler burns to the end. This is one of the serious disadvantages of solid fuel engines, compared to other analogues. However, in real space ballistic media, solid fuel materials are used only at the initial stage of the flight. In the following stages, other types of rocket fuel are used, so the shortcomings of solid-fuel compositions do not represent a significant problem.