The drainage device of a gas turbine engine with compressor

 

(57) Abstract:

Usage: in the aircraft engine industry. The inventive drainage device comprises a drain tank 1 to the intake opening 2 and which to the input and output pipes pre-supply pump 3 is connected to the fuel injector 4. In line 5 of the fuel discharge installed shut-off valve 6 and valve 7. Perelivnoj element 8 shut-off valve 6 has an actuator in the form of a membrane 9, in the control cavity 10 which is placed the spring 11. The device also includes an air ejector 12, the active nozzle which is connected to the compressor of the engine, the mixing chamber with the tank 1, and the passive nozzle communicated with the control cavity 10 and through a nozzle 13 with a signal hole 14 of the tank 1. Moreover, the hole 14 is located at a level above the intake openings. 1 Il.

The invention relates to aircraft engine industry, and more specifically to fuel drainage systems of gas turbine engines (GTE).

Known drainage device GTE containing drainage tank, placed in the fuel tank ejector mounted in-line removal of fuel from the tank check valve and located in front of the active nozzle of the ejector solenoid shutoff valve [1] P is providing shut-off valve is supplied from the button start the engine.

A disadvantage of the known device is that, due to the need for accommodation in the drainage tank ejector tank should have sufficient height sizes. In some cases, to install such tanks in the lower points of the engines due to the limited dimensions is not possible, which makes it difficult to use this device on GTE.

Closest to the invention to the technical essence and the achieved result is a drainage device GTE containing drain tank connected to the intake opening of the tank and to the input and output pipes of the transfer pump fuel ejector, and managed cutoff (float) and check valves are installed in-line removal of fuel between the tank and the ejector [2] In this device, when the engine is running fuel is drawn from the tank by the ejector and discharged into the inlet of the transfer pump. Control shut-off valve carried by the float for the fuel level in the tank.

A disadvantage of the known drainage device is that the cutoff (float) valve must be placed inside the tank, since the float monitors the fuel level. This leads to higher dimensions tank height and condition aceveda scope of such devices, and difficult because of their unification.

These drawbacks are eliminated when using a drainage device having a drain tank with a small height and a more simple design. If the prototype control shut-off valve is carried out using a float placed in the drainage tank, in the inventive device shut-off valve controls the air ejector with the nozzle in the suction line, allowing these elements and shut-off valve be placed separately from the tank and thereby to perform the drainage tank is the minimum size and to simplify its design. These advantages of the proposed device allows you to place drainage tanks in the lowest points of the engine, providing recycling merging of fuel, and to unify the elements located outside the tank, to combine them into a single unit and mounted in any convenient location on the engine.

The invention consists in that the drainage device of the CCD containing the drainage tank, fuel injector, connected to the intake opening of the tank and to the input and output pipes of the transfer pump, and installed in-line removal of fuel between the tank and fuel ejector managed Taisto additionally there is an air ejector, active nozzle which is connected to the compressor of the engine, the camera offset to the tank, and the passive nozzle communicated with the control cavity servo and through a nozzle with a signal hole tank located at a level above the intake openings.

The drawing shows a diagram of the inventive drainage device.

The drainage device comprises a drain tank 1 to the intake opening 2 and which to the input and output pipes pre-supply pump 3 is connected to the fuel injector 4. In line 5 of the fuel discharge installed shut-off valve 6 and valve 7. Diverter element 8 shut-off valve 6 has an actuator in the form of a membrane 9, in the control cavity 10 which is placed the spring 11. The device also includes an air ejector 12, the active nozzle which is connected to the compressor of the engine, the mixing chamber with the tank 1, and the passive nozzle communicated with the control cavity 10 and through a nozzle 13 with a signal hole 14 of the tank 1. The hole 14 is located at a level above the intake openings 2.

Drainage device operates as follows.

Of the units 15, the fuel is discharged into the tank 1. During engine operation to the active nozzle of the ejector 4 is fed fuel from vychodne 12 creates a vacuum in the control cavity 10, the value of which depends on the fuel or air podkashivayutsya through a nozzle 13. If the fuel level in the tank 1 above the signal holes 14, through a nozzle 13 to the ejector 12 is supplied fuel and the pressure in the cavity 10 such that the spring 11 holds the membrane 9 and overlaps the element 8 in the right (open) position. Under the influence of the vacuum created by the ejector 4, the check valve 7 opens, and from the tank 1 through the suction hole 2 through line 5 is the removal of the fuel and its supply at the inlet of the transfer pump 3. Reducing the level of fuel in the tank is below the signal holes 14 causes the flow through the nozzle 13 to the ejector 12 air instead of fuel. This causes a sharp increase in the vacuum in the cavity 10, the membrane 9 compresses the spring 11 and moves the diverter element 8 shut-off valve 6 to the left (closed) position. Line 5 fuel discharge is blocked or remove fuel from the tank 1 is terminated.

If the fuel level in the tank again rises above the openings 14, there is a decrease in the vacuum in the control cavity 10, the opening shut-off valve 6 and the removal of fuel. The air coming into the tank 1 from the ejector 12, is discharged through the opening 16 in the atmosphere is Azad from the fuel system into the tank 1.

When the flow of fuel through the nozzle 13 mass flow rate GGTand the differential pressure PGTon the jet connected by the relation

GGTwheretthe density of the fuel;

PGTPBPUPT;

Pbthe pressure in the tank;

PUPTthe pressure in the control cavity 10 when the flow through the nozzle 13 of the fuel.

At low differential pressure mass air flow (GWWthrough a nozzle 13 is also connected with the pressure difference ( PWW) ratio

GWWwhereinthe density of air;

PWW= PbPOla;

POlathe pressure in the control cavity 10 when the flow through the nozzle 13 of the air.

For ejector can be written

GEOLnEOL.Ginwhere GEOLconsumption, environment, sucked by the ejector;

Ginair flow through the active nozzle of the ejector;

nEOLthe coefficient of ejection (Sokolov E. Y. singer, N. M. Inkjet units. M Energy 1970).

The coefficient of ejection connected with the pressure at the inlet and outlet of the ejector by the following ratio:

nEOLwhere Rinthe air pressure in front of the active nozzle of the ejector 12;

Psunthe pressure in the cavity of the suction , leads to the reduction of mass flow rate through the nozzle. Indeed, if we assume RWWPGT,in1.2 kg/m2andt780 kg/m3then

22,5 i.e. the mass flow rate of air 22.5 times smaller than the mass flow of fuel. Since GEOLGWW(previously GEOLGVT)in the same time decreases and the flow sucked by the ejector 12. But since Ginconst, it means that decreases the coefficient of ejection, which is possible only (Pbconst, Rinconst) at reduced pressure RVS, i.e., with increasing dilution.

Previously it was accepted for PWWPGT. Actually, Rvers< PUGTand RWW> PGT. However, attitudes are always a lot of sensecam attitude and the final result is not changed.

From the above it follows that the admission of air instead of fuel through the nozzle 13, the magnitude of the vacuum in the control cavity increases.

Thus, the device allows you to place drainage tanks in the lowest points of the engine, providing recycling merging of fuel. Both ejector shutoff and check valves and the nozzle can be manufactured as a single unified unit by placing it in any convenient place on the engine.

Tenantable tank shut-off valve with actuator, connected to the fuel injector associated with the fuel pump, characterized in that it comprises an air ejector with active, passive nozzles and the mixing chamber and the nozzle, the actuator shut-off valve is made in the form of a spring-loaded diaphragm, which is located in its management of the cavity, and in the side wall of the tank made the hole, and an active air nozzle of the ejector is connected to the compressor of the engine, a mixing chamber with drainage tank, and the passive nozzle communicated with the control cavity of the actuator and through a nozzle with a hole in the side wall of the tank.

 

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