Related Publications

The following thesis, journals and conference papers all contain material relevant to the theoretical methods applied to our engine filter expertise.

Thesis

Rotorcraft Engine Air Particle Separation

Publication: PhD Thesis, School of MACE, The University of Manchester, Dec 2012
Author: N Bojdo

The present work draws together all current literature on particle separating devices and presents a review of the current research on rotor downwash-induced dust clouds. There are three types of particle separating device: vortex tube separators; inlet barrier filters; and inlet particle separators. Of the three, the latter has the longest development history ...
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Journals

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Self-Cleaning Barrier Filter for Rotorcraft Engines

Publication: The Aeronautical Journal, In press 2014
Authors: N Bojdo & A Filippone

A parameter-based study of a novel self-cleaning barrier filter concept for rotorcraft engines is presented. Existing inlet barrier filters for rotorcraft achieve a high separation efficiency (up to 99% for a dust resembling AC Coarse test dust) at the expense of a pressure drop that increases over time. Other engine protection devices with invariant ...
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Operational Performance of Inlet Barrier Filters for Rotorcraft

Publication: The Aeronautical Journal, 116(1182), Aug 2012
Authors: N Bojdo & A Filippone

Inlet Barrier Filter systems (IBF) are an essential piece of hardware in the operation of helicopters to and from unprepared landing sites. They are installed ahead of the engine in a variety of configurations, determined by the engine-airframe integration and mass flow requirements ...
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Fabric Filter Performance for Helicopter Inlet Barrier Filters

Publication: AHS Journal, 57 (3), 032002, DOI: 10.4050/JAHS.57.0320, Jul 2012
Authors: N Bojdo & A Filippone

An inlet barrier filter system is integrated into the intake of a helicopter to perform the task of removing potentially harmful particles from engine-bound air. While performing a vital duty in the prolonging of engine life, their use may incur a loss of engine performance as a result of the pressure loss that is synonymous with air passing through a porous barrier ...
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Performance Prediction of Inlet Barrier Systems for Rotorcraft Engines

Publication: Journal of Aircraft, 48(6), pp. 1903-1912. DOI: 10.2514/1.C031335, Nov 2011
Authors: N Bojdo & A Filippone

An insight into the design parameters that dictate engine inlet barrier filter performance is presented. The work represents the first part of a two-part study into the factors affecting the performance of engine inlet barrier filter to ultimately enable the prediction of turboshaft engine performance during use of this air-particle separating device ...
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Turboshaft Engine Air Particle Separation

Publication: Progress in Aerospace Sciences, 46(2), pp. 224-245, DOI: 10.1016/j.paerosci.2010.02.001, Feb 2010
Authors: A Filippone & N Bojdo

This contribution addresses air particle separation technologies (EAPS) used for helicopter turboshaft engines that operate around unprepared airfields. Three key technologies are discussed. These are: vortex tube separators, inertial particle separators and inlet barrier filters ...
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Conference Papers

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A Comparative Study of Helicopter Engine Air Particle Separation Technologies

Publication: Paper 158, European Rotorcraft Forum, Amsterdam, The Netherlands, Sep 2012
Authors: N Bojdo & A Filippone

An investigation into the efficacy of helicopter engine sand filters is conducted. Engine Air Particle Separation devices are broadly split into three categories: Vortex Tube Separators, Integrated Particle Separators, and Inlet Barrier Filters ...
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Helicopter Engine Intake Barrier Filter Design

Publication: European Rotorcraft Forum, Milan, Italy, Sep 2011
Authors: N Bojdo & A Filippone

This contribution concerns the design of Intake Barrier Filters (IBF) for Helicopters. These protective devices are fitted to the engine intakes of helicopters to prevent sand and dust reaching the engine during operations in dusty environments. Their design is dependent on and unique to the rotorcraft to which they are fitted ..
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Operational Performance Parameters of Engine Inlet Barrier Filtration Systems for Rotorcraft

Publication: 67th AHS Forum, Virginia Beach, VA, May 2011
Authors: N Bojdo & A Filippone

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 ...
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Performance Prediction of Inlet Barrier Filter Systems for Rotorcraft

Publication: European Rotorcraft Forum, Paris, Sep 2010
Authors: N Bojdo & A Filippone

An insight into the design parameters that dictate Engine Inlet Barrier Filter (IBF) performance is presented. The work represents the first part of a two part study into the factors affecting the performance of IBF, to ultimately enable the prediction of turboshaft engine performance during use of this air-particle separating device ...
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