초록 ▼

A method for reliably starting a gas turbine engine includes commanding a rapid transient enrichment of the fuel quantity delivered to the engine combustion chamber, maintaining the fuel quantity at the enriched level while operating the engine's ignition system, and, upon the expiration of a fixed

A method for reliably starting a gas turbine engine includes commanding a rapid transient enrichment of the fuel quantity delivered to the engine combustion chamber, maintaining the fuel quantity at the enriched level while operating the engine's ignition system, and, upon the expiration of a fixed time interval or an indication of successful ignition, commanding a derichment to a fuel quantity equal to that which would be obtained during a conventional startup procedure. The degree of transient enrichment depends on the operating environment and operational state of the engine. In one embodiment of the invention the rate of enrichment corresponds to a virtual step change in the commanded fuel quantity and the rate of derichment is less than the rate of enrichment.

대표청구항 ▼

[ We claim:] [1.] For a gas turbine engine having a combustor, a fuel system for supplying fuel to the combustor, a control system capable of issuing a fuel flow command to the fuel system, and an ignition system for providing a source of ignition, a method of starting the engine, characterized by:i

[ We claim:] [1.] For a gas turbine engine having a combustor, a fuel system for supplying fuel to the combustor, a control system capable of issuing a fuel flow command to the fuel system, and an ignition system for providing a source of ignition, a method of starting the engine, characterized by:increasing the fuel flow command from an initial value to a target value at a rise rate corresponding to a virtual step change, the target value being a function of at least one of the operating environment of the engine and the operational state of the engine;maintaining the fuel flow command at the target value for a fixed time interval; anddecreasing the fuel flow command from the target value to a terminal value at a decay rate which is slower than the rise rate.