초록 ▼

A modulating surge prevention control and method for a gas turbine engine having a variable geometry diffuser is provided. The control calculates a maximum permissible compressor discharge pressure from a predetermined algorithim that is representative of the compressor discharge pressure when the c

A modulating surge prevention control and method for a gas turbine engine having a variable geometry diffuser is provided. The control calculates a maximum permissible compressor discharge pressure from a predetermined algorithim that is representative of the compressor discharge pressure when the compressor is operating at its minimum permissible surge margin with the diffuser in its maximum open position. The control also receives a signal from a sensor measuring the actual compressor discharge pressure. A error signal is formed by taking the difference between the measured pressure signal and the calculated signal. The control then continously adjusts the area of the diffuser so as to maintain the actual compressor discharge pressure at or below the calculated pressure. The calculated pressure is also corrected for variations in ambient temperature and altitude.

대표청구항 ▼

A method for preventing surge of a gas turbine engine compressor having a variable geometry diffuser that is positionable between a maximum open setting and minimum open setting, comprising the steps of: receiving a plurality of signals representative of said engine\s inlet temperature, inlet pressu

A method for preventing surge of a gas turbine engine compressor having a variable geometry diffuser that is positionable between a maximum open setting and minimum open setting, comprising the steps of: receiving a plurality of signals representative of said engine\s inlet temperature, inlet pressure, compressor discharge pressure and said diffuser position respectively; preselecting a compressor pressure ratio representative of minimum permissible surge margin with the diffuser in said maximum open setting; calculating a first maximum compressor discharge pressure from said inlet temperature and pressure signals and said preselected pressure ratio and generating a signal thereof; combining said calculated discharge pressure signal with said discharge pressure signal to form an error signal; preselecting a maximum open setting for said diffuser and adjusting said maximum setting for variations in inlet pressure, and generating a command signal thereof; combining said command signal with said error signal and said diffuser position signal to form a second command signal; receiving said second command signal and generating a control signal for said diffuser; and repeating said previous steps until said error signal is substantially zero.