HEALTH MONITOR FOR AIR SWITCHING VALVE OF A GAS TURBINE BLEED SYSTEM

A method of operating a gas turbine engine (10) having a bleed air system (18) with a switching valve (14), operable to switch between multiple air sources (17, 21) depending on an operating mode of the gas turbine engine (10) (e.g. a motive powered mode or a standby mode), is described. The method...

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Bibliographische Detailangaben
Hauptverfasser:	MANOUKIAN, Patrick, MOKHTAR, Hytham, SMITH, Michael Paul, ARNONE, Daniel
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	AIR INTAKES FOR JET-PROPULSION PLANTS BLASTING COMBUSTION ENGINES CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS GAS-TURBINE PLANTS HEATING HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS LIGHTING MECHANICAL ENGINEERING WEAPONS
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Beschreibung
Zusammenfassung:	A method of operating a gas turbine engine (10) having a bleed air system (18) with a switching valve (14), operable to switch between multiple air sources (17, 21) depending on an operating mode of the gas turbine engine (10) (e.g. a motive powered mode or a standby mode), is described. The method includes operating the switching valve (14) to provide pressurized air from a selected one or more of the multiple air sources (17, 21) to a cavity of the gas turbine engine (10) having seals, and testing the switching valve (14) to determine if the switching valve (14) is functioning normally or abnormally. The switching valve (14) is functioning normally when operable to switch between the multiple air sources (17, 21) and is functioning abnormally when switching between the multiple air sources (17, 21) is not possible. If the switching valve (14) is determined to be functioning abnormally, the gas turbine engine (10) is controlled to prevent a change of the operating mode.