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Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/20139

Title: Evaluating environmental control system thermal response to degraded operating conditions
Authors: Childs, Thomas
Jones, Andy
Chen, Rui
Murray, Angus
Issue Date: 2016
Publisher: © American Institute of Aeronautics and Astronautics
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.
Abstract: 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.
Description: 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
Sponsor: This project is co-funded by: the Engineering and Physical Sciences Research Council EPSRC) UK, BAE Systems, and Loughborough University.
Version: Accepted for publication
DOI: 10.2514/6.2016-1151
URI: https://dspace.lboro.ac.uk/2134/20139
Publisher Link: http://dx.doi.org/10.2514/6.2016-1151
Appears in Collections:Published Articles (Aeronautical and Automotive Engineering)

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