Engine fuel supply to the FCC

In the fuel supply system of the engine with FCC, for example TRDDF, in addition, but there is a centrifugal afterburner high-pressure pump FN for supplying fuel to the FCC and a plunger pump of the nozzle HC for feeding high-pressure fuel of the hydraulic cylinders of the control system of the position of the flaps of the jet nozzle. At the input of these pumps, fuel is supplied from the outlet of the DHP pumping pump, and their rotation is from the CPA. The fuel dosing in the FCC is performed by the DUF type throttle device installed after the FN pump. Further, the fuel distributor PTF is used to distribute fuel through the afterburner combustion manifolds. The fuel supply system can be constructed with the use of separate dispensers of fuel metering devices in each collector STP. Then it does not require a fuel distributor RTF. At the entrance to the FN there is a shut-off valve for the afterburner, which blocks the access of fuel from the CCPs to the unrestricted operating conditions of the engine and when the temperature of the fuel exceeds the permissible value. To cool the oil in the engine lubrication system, after fuel dispensers DU and DUF fuel oil heat exchangers TMTms are installed. Emergency fuel draining from aircraft tanks is carried out in this STF by means of an afterburner pump via the KST fuel drain valve.

High-pressure pump delivers the fuel nozzle of the National Assembly in the control unit of hydraulic cylinders to move the valves, variable area nozzle throat. The hydraulic cylinders drive the circulation of the fuel nozzle is introduced to provide the necessary heat drive mode. Mode of operation of the National Assembly is determined by a special control unit, powered by fuel NVD.

Drain fuel from the fuel systems of all units (dispensers, fuel valves, hydraulic cylinders) are usually carried out at the entrance DTSN.

Booster pump STP often performed as shnekotsentrobezhny. Head DTSN selected so as to ensure the work of high pressure pumps without cavitation and is 0,3. .0,6 MPa at speeds 6000. .9000 Min-1. Maximum capacity DTSN defined as the sum of maximum fuel consumption in main and afterburner combustion engine (engine with the FCC), as well as the fuel needed to operate the units of ACS, and possible leaks.

The maximum fuel pressure at the output of the high pressure pump of the volumetric type (a gear, piston) for supplying the ACS at maximum engine operation at a maximum pressure of the gas therein is 9. .13 MPa at speeds 5000.8000-1 minutes and costs up to 10000 kg / h.

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