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ARP4056A - Engine Exhaust System Design Considerations for Rotorcraft

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Document Number: ARP4056A
Project Initiation: 06-30-2012
Project Number:
Revision Number: A
Sponsor Name: Adriano Cirioli
Title
Engine Exhaust System Design Considerations for Rotorcraft
Scope
Turbine engines installed in rotorcraft have an exhaust system that is designed and produced by the aircraft manufacturer. The primary function of the exhaust system is to direct hot exhaust gases away from the airframe. The exhaust system may consist of a tailpipe, which is attached to the engine, and an exhaust fairing, which is part of the rotorcraft. The engine manufacturer specifies a baseline "referee" tailpipe design, and guaranteed engine performance is based upon the use of the referee tailpipe and tailpipe exit diameter. The configuration used on the rotorcraft may differ from the referee tailpipe, but it is intended to minimize additional losses attributed to the installation. This Aerospace Recommended Practice (ARP) describes the physical, functional, and performance interfaces to be considered in the design of the aircraft exhaust system.
Rationale
This document to be revised to expand on critical phyisical interfaces and include attention to turbine burst debris containment and flight path. In addition, exhaust loss 1-D model will be expanded and a better description provided. A fire integrity section to be added, i.e. insulation recommnedation if exhaust system is installed in a composite nacell structure.
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