Rolls-royce Corporation

Michael R Lyons

David H Taylor

John E Cureton

A gas turbine engine fuel system comprises a main fuel manifold and starter fuel manifold which direct fuel into the combustion apparatus of a gas turbine engine. During normal engine operation, fuel flow to the starter manifold is prevented by a solenoid valve. Air from within the combustion apparatus then flows back through the starter manifold and into a fuel drains system of the engine to purge the starter manifold of fuel. This purging of fuel in the starter manifold engine operation prevents the undesirable leakage of fuel into the combustion apparatus from the starter manifold.

Gas turbine engine fuel system

A fuel system for a gas turbine engine is arranged to schedule fuel flow between primary and secondary fuel injectors in order to obtain good ignition and light round when the engine is operating on diesel fuel. The system includes either two solenoid valves in parallel with flow restrictors or a single solenoid operated valve and two flow restrictors. The two valves or the diverter valve schedule the fuel flow so that at engine start up, the flow to the primary and secondary fuel injectors is according to requirement proportioned. At a certain engine speed the flow to the secondary fuel injectors is reduced to purge flow and the major part of the fuel flow passes to the primary fuel injectors.

Gas turbine engine fuel systems

A control apparatus for the bleed valve of a gas turbine engine compressor enables the engine to be operated with a low risk of compressor surge or stall, particularly on emergency shut down. The control apparatus includes a control valve and a diverter valve. In normal operation the bleed valve is controlled by the control valve which receives a flow of high pressure air from the engine compressor. In an emergency shut down, the diverter valve is operated to allow the high pressure air to flow directly to the bleed valve, without passing through the control valve. The diverter valve can be fuel pressure responsive or solenoid operated.

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Leicester, United Kingdom

Michael R Lyons