The provided diagram illustrates a simple rocket engine system and a combustion process.
Overall, there are two tanks where fuel and oxygen is being stored and one chamber which combusts those injections.
To start the process, the fuel tank pushes fuel to a fuel pump, and oxygen in other tank goes into a oxidizer pump. Fuel pumps move through a pipe and are being injected to the combustion chamber by an injector. At the same time, oxygen is thrown from another pipe to the same chamber. The oxygen channel is straight and do not have any curves, while a fuel channel has double curves.
The chamber which contains the mixture has a shape similar to tanks. Inside a chamber combustion products are being prepared by combusting fuel and oxygen. Then this product is expeled from the end of chamber to a nozzle. A trapezium shaped nozzle is the end of the engine structure.
