A complete set of equipment to supply fuel with a certain pressure, flow and temperature to the combustion chamber of the aeroengine, to the afterburner and to the starting oil circuit (see figure) The fuel supplied by the fuel tank enters the fuel oil cooler after being pressurized by the auxiliary pump through the fuel switch.
The radiator uses the fuel to take the heat out of the lubricating oil, the fuel itself is preheated, then the impurities are removed by the fuel filter and then sent to the main fuel pump and the fuel pump. from afterburner for a new boost.
The pressurized high-pressure fuel is separately controlled by the main fuel controller and the afterburner fuel controller (see fuel controller) to meet in-flight needs.
Then the main fuel is divided into the main and auxiliary oil passages by the fuel distributor through the throttle switch and is sent to the combustion chamber through the nozzle for combustion. When the engine needs afterburner, the afterburner fuel is sent to the afterburner through the afterburner switch and the combustion nozzle.
When the engine is started, there is an independent starting fuel system, including a starter oil pump, starter solenoid valve, and starter nozzle. The oil leakage system is used to eliminate fuel oil leakage through the sealing device and oil accumulation in the combustion chamber. The fuel drain system quickly discharges fuel into the nozzle oil circuit after the engine is stopped to prevent the nozzle from depositing carbon.
The fuel pump is the most important fuel supply equipment in the system. There are 5 types of gear pump, plunger pump, rotary plate pump, centrifugal pump and steam core pump.