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Influences on the Oil Split Between the Offtakes of an Aero-Engine Bearing Chamber

Influences on the Oil Split Between the Offtakes of an Aero-Engine Bearing Chamber
Tagung:

ASME Turbo Expo 2012
Power for Land, Sea and Air
Paper GT2012-69412

Tagungsort:

Copenhagen, Denmark

Datum:

June 11-15, 2012

Autoren:

Kurz,W.
Dullenkopf,K.
Bauer,H.-J.

Abstract

 

The aim of the presented work was to identify factors that influence the oil split between the two offtakes of a vented aeroengine bearing chamber. The impact of different vent and scavenge offtake designs was experimentally investigated with a test rig at the Institute of Thermal Turbomachinery (ITS) at the Karlsruher Institute of Technology (KIT). The generic bearing chamber was also equipped with ten film thickness sensors. The film measurements allowed a further evaluation of the mechanisms behind different oil splits. Two of the examined offtake features ensured a very constant oil split: a protruding vent and a covered ramp offtake. The latter also decreased the oil film thickness on the bearing chamber walls significantly. Furthermore, an influence of a non-uniform seal gap was detected which altered the oil split by several percent.