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Operational performance of inlet barrier filters for rotorcraft

Published online by Cambridge University Press:  27 January 2016

N. Bojdo  and
A. Filippone
A. Filippone*
Affiliation:
Department of Mechanical, Aerospace and Civil Engineering, University of Manchester, Manchester, UK
*
A.Filippone@manchester.ac.uk
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Abstract

This contribution addresses the subject of engine inlet barrier filters (IBF) for rotorcraft. The purpose of an IBF is to mitigate the risk of particle ingestion by the engine, a situation that can cause irrevocable damage to key components. The risk is significantly elevated during a brownout landing, in which the rotor wake of a descending helicopter interacts with loose ground sediment, causing the generation of a dust cloud. In such a condition, an IBF successfully removes particles from the engine-bound air at the expense of a pressure drop, which grows temporally. The increase in pressure drop is caused by but not limited to an increase in incident velocity and a decrease of mean particle size; however the rate may be slowed by operating the filter at a tangential angle to the flow. The current work presents findings of a parametric study into the factors affecting particle accumulation and the consequential loss of inlet total pressure.

Type
Research Article
Information
The Aeronautical Journal , Volume 116 , Issue 1182 , August 2012 , pp. 847 - 869
Copyright
Copyright © Royal Aeronautical Society 2012 

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