| 摘要 |
A tortuous path quiet exhaust eductor system may be mounted to a gas turbine engine, such as commercial aircraft APU. The system includes an oil cooler, eductor primary nozzle, oil cooler nozzle, and surge air dump nozzle. The primary nozzle, oil cooler air nozzle, and surge air dump nozzle direct exhaust flow to entrain APU compartment cooling air, oil cooling air and sur ge air in a direction having both radial and axial components with respect to t he APU centerline axis. The exhaust flow is directed into an eductor mixing duc t angled away from the centerline axis and then is turned to enter an exit duc t angled toward the centerline axis so that direct line of sight acoustic path s from the tail pipe exit to the turbine exit are blocked, suppressing core noise. The tail pipe ducts may be acoustically treated, further enhancing noise suppresion.
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