DESIGN, DEVELOPMENT, SIMULATION AND REALIZATION OF EXPANSION JOINTS IN ECS ENGINE BLEED SYSTEM FOR A TYPICAL LIGHT TRANSPORT AIRCRAFT

Akshatha, HT and Rinku, A and Shankar, ML and Banakara, Prashanth (2014) DESIGN, DEVELOPMENT, SIMULATION AND REALIZATION OF EXPANSION JOINTS IN ECS ENGINE BLEED SYSTEM FOR A TYPICAL LIGHT TRANSPORT AIRCRAFT. ARPN Journal of Engineering and Applied Sciences, VOL. 9 ( NO. 5). pp. 682-686. ISSN 1819-6608

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Abstract

In a commercial aircraft, ventilation to the cabin is normally through environmental control system normal bleed air system, ECS emergency back-up pressurization system and ram air. Bleed air is primarily used to provide pressurization by supplying air to the environmental control system. Additionally, bleed air is used for de-icing of aircraft leading edges. The bleed air needs to be tapped from engine and conveyed to the ECS pack through pipe routings. The bleed air pipes that tap the air from engine would experience a varying pressure load (as high as 140psi) and varying temperature (as high as 340°C) at different segments. This would obviously produce the expansion/ contraction of pipes which will result in axial moment and swaying of pipelines from their nominal configuration. These movements should be compensated by means of providing suitable expansion joints/thermal compensators to avoid undesirable loads at the support points which may affect the overall functioning of the system. The real challenge lies in designing such a complex system where suitable expansion joints need to be provided within stipulated airframe configuration satisfying the installation requirements, yet cost and weight effective. In the present work, a methodology has been developed for design of ECS pipe routings, using flexible hose- metallic bellows as a thermal compensator, with the aid of finite element analysis. This paper also talks about the qualification of the bellows through acceptance tests and implementation on a typical light transport aircraft.

Item Type: Article
Subjects: AERONAUTICS > Aircraft Design, Testing & Performance
ENGINEERING > Mechanical Engineering
ENGINEERING > Structural Mechanics
Depositing User: H T Akshatha
Date Deposited: 20 Nov 2014 03:51
Last Modified: 20 Nov 2014 03:51
URI: http://nal-ir.nal.res.in/id/eprint/12024

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