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Evaluating environmental control system thermal response to degraded operating conditions

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conference contribution
posted on 2016-01-26, 11:17 authored by Thomas Childs, Andy Jones, Rui Chen, Angus Murray
This paper documents an investigation into the performance and thermal efficiency of an air-cycle Environmental Control System (ECS) artificially injected with common operational failure modes. A two-wheel bootstrap system is taken from an in-service military fast-jet and installed in a bespoke Ground Test Facility (GTF) at the ECS Research Facility, Loughborough University, UK. The failure modes investigated are bleed air blockages in the intercooler and in the low-pressure water extractor, as well as positional inaccuracy in cycle bypass control valves. The full range of degradation in each fault is considered, allowing the quantification of overall system performance degradation. The performance of the system is found to be insensitive to moderate bleed air blockages (up to 80% by pipe cross-section area), whilst blockages at low pressure are more detrimental to cycle performance than blockages at high pressure. The cycle and/or control system will self-regulate around most degrading-type faults. This particular system is most sensitive to a failure at one bypass valve, where the hardware allows partial redundancy of the valve but the control system does not.

Funding

This project is co-funded by: the Engineering and Physical Sciences Research Council EPSRC) UK, BAE Systems, and Loughborough University.

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Aeronautical and Automotive Engineering

Published in

AIAA SciTech, 54th AIAA Aerospace Sciences Meeting

Volume

AIAA 2016-1151

Citation

CHILDS, T. ...et al., 2016. Evaluating Environmental Control System Thermal Response to Degraded Operating Conditions. Presented at: 54th AIAA Aerospace Sciences Meeting, AIAA SciTech, San Diego, USA, AIAA 2016-1151.

Publisher

© American Institute of Aeronautics and Astronautics

Version

  • AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2016

Notes

This paper was accepted for publication by the AIAA and the definitive published version is available at: http://dx.doi.org/10.2514/6.2016-1151

Language

  • en

Location

San Diego, California, USA

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