Study of various flexible joints as the thermal compensator elements in a typical light transport aircraft engine bleed system

Banakara, Prashanth and Akshatha, HT and Shankar, ML and Rinku, A (2015) Study of various flexible joints as the thermal compensator elements in a typical light transport aircraft engine bleed system. In: 2nd International and 17th National Conference on Machines and Mechanisms, iNaCoMM 2015, 16-19 December 2015, IIT, Kanpur.


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Engine bleed system helps in pressurisation and ventilation of aircraft cabin. Air tapped from the engine will be supplied to the bleed system, whose operating temperature and pressure will be of 340°C and 140psi (differential) respectively. Due to the variation of temperature and pressure, the extension of pipes will produce high loads at the bends and supports, which should not exceed the limits specified by the engine manufacturer. Hence, it is necessary to choose a suitable thermal compensator to account for thermal expansion in the system and to reduce support reactions. The present work deals with study of various standard flexible joints like gimbals, bellows-braided and un-braided for engine bleed system of a typical light transport aircraft. For the simulation and analysis, commercially available finite element software like Altair Hypermesh and MSC Nastran were used. Initially, these flexible joint mechanisms were studied in isolation at element level and the results were compared with the guidelines of Expansion Joints Manufactures Association handbook. Once the study was found satisfactory, the compensators were introduced in the pipe system and analysis of entire assembly was carried out. During the study various parameters such as compensator location, their number, stiffness and optimal pipe routings were considered. Based on extensive study, braided bellows were found to be most effective thermal compensators for the present aircraft configuration. The braided bellow was designed and developed as per the analysis results and was successfully realised on the aircraft and found to function satisfactorily. © 2015, Indian Institute of Technology, IIT. All rights reserved.

Item Type: Conference or Workshop Item (Paper)
Subjects: AERONAUTICS > Aircraft Design, Testing & Performance
Depositing User: Mrs SK Pratibha
Date Deposited: 12 Jun 2018 08:56
Last Modified: 12 Jun 2018 08:56

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