Cmbustion process in rocket engines

The diagram reveal the structure is a basic rocket engine and how it works, firstly the engine has two types of vessel, the Fuel container and the Oxygen tank; these are connected through other pieces. For example, the fuel container is linked with fuel pump and one of the injectors prior to the fuel can pass to the combustion chamber, in the other hand, oxygen tank need to be connected to an oxidizer pump and the other injector to reach the ignition chamber in which eventually, both elements can be mixed to produce combustion products. After that process, this ignition products are released through a nozzle. For instance, we have knowledge about the gas boiler and it functions, this gas boiler has less the same process in which two various elements (gas and water) are combined to give us hot water. They also have different hoses who drive these elements into a chamber in which they mixed.