METHOD OF ANTI-SURGE PROTECTION OF GAS TURBINE ENGINE Russian patent published in 2009 - IPC B64D31/00 F04D27/02 

FIELD: engines and pumps.

SUBSTANCE: invention relates to aircraft engine automatic control. Proposed method comprises control over air pressure variations behind compressor effected by wideband and low-frequency surge indicators. Signal received simultaneously from both indicators, surge elimination devices are actuated by signal generated in response to two signals above. The latter signal is sent at time delay corresponding to one low-frequency air pressure surge change behind the compressor. This allows self-elimination of surge during said time delay and, hence, rules out operation of surge elimination devices to add to helicopter control safety at lower heights and at false operation of anti-surge protection. Note here, that availability of two pressure control gauges increases system reliability. Note also that signal received from surge low-frequency surge is stored for preset time corresponding to maximum possible surge liquidation time. Thanks to low-frequency signal locking, two signals are generated to switch on surge elimination devices in case surge is repeated of signal from only one wideband indicator is received.

EFFECT: higher safety.

2 cl, 4 dwg