Abstract
PURPOSE:To reduce the exhaust noise especially by using air for rotating a fan of an auxiliary propulsion device after passing high pressure air from a main compressor to a sub-compressor of a by-pass passage at the time of low speed, and by exhausting the high pressure air from the main compressor, from a main passage at the time of high speed. CONSTITUTION:A main compressor 3 is arranged in the front between an outer cylinder 1 and an inner cylinder 2, and a main passage 4 at the downstream side of the main compressor 3. At the downstream side of the main passage 4, a sub-passage 6 which is communicated with the main passage 4 is arranged through a primary shutter 5. There is provided a by-pass passage 9 which is communicated with the main passage 4 through a secondary shutter 7, and with the sub-passage 6 through a third shutter 8. A main combustion chamber 10 and a main turbine 11 are arranged at the sub-passage 6, and a sub- compressor 12, a sub-combustion chamber 13 and a sub-turbine 14 are arranged at the by-pass passage 9. A duct 15 is connected to the downstream side of the sub-compressor 12, and the duct 15 is connected to the auxiliary propulsion device 17 through a high pressure air controller 16.
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