Controlling guide vane angle of an axial-flow compressor of a gas turbine engine

摘要

A first detector (35) detects a first pressure PS1 in the compressed fluid downstream variable angle guide vanes 30 which is influenced by their angular setting, and a second detector 37 detects a second, higher pressure PH in the compressed fluid which is substantially independent of the setting of the guide vanes but is functionally dependent upon the rotational speed of a compressor 20 of the engine 10, the detected pressures being used by a control unit 36 to cause an actuation mechanism 38, 40, 42, 44 to adjust the angle of the guidevanes in a predetermined manner dependent upon the ratio IMAGE IMAGE