22nd Congress of International Council of the Aeronautical Sciences, Harrogate, UK, 28 August - 1st September, 2000
Paper ICAS 2000-5.1.1

DEVELOPMENT OF AN AEROENGINE SECONDARY AIR SYSTEM EMPLOYING VORTEX REDUCERS

M. Pfitzne, W. Waschka
Rolls-Royce Deutschland, Eschenweg 11, D-15827 Dahlwitz, Germany

Keywords: aeroengine gas turbine, secondary air system, vortex reducer

Modern aeroengine designs use a secondary air system to cool the rotor discs and to seal cavities between rotor and stator parts. Air is bled from the inner compressor annulus to internal parts of the engine. A vortex reducer system can reduce pressure losses along the flow path due to high swirl. The paper describes two vortex reducer systems, tubed and tubeless, both employed in BR700 aeroengines in service. The characteristics and merits of both systems are discussed and test results from rig and engine tests are shown.

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